Fueling Female Athletes for HYROX & CrossFit Events

Event Profile and Athlete Segmentation

HYROX and CrossFit competitions are hybrid endurance-strength events that tax multiple energy systems. A HYROX race consists of eight 1 km runs each followed by a functional workout (e.g. sled push, burpees, rowing), standardized worldwide. Elite female athletes complete HYROX in roughly 55–75 minutes, while recreational participants often take 90–120 minutes[1]. CrossFit competitions typically involve repeated high-intensity WODs (Workouts of the Day) ranging from seconds to ~20 minutes, but some events (or combined workloads in a day) can approach the 60–120 minute range when considered cumulatively. These durations and intensities mean athletes need strategic nutrition: elites (fitter, faster) operate at higher intensity for ~1 hour, and recreational athletes (Levels 1–3) sustain effort for up to 2 hours at a relatively lower intensity. In both cases, optimal performance requires starting with maximized energy stores and maintaining fuel availability during the effort.

The longer race time of recreational athletes implies proportionally greater reliance on endurance fuel stores and hydration. Elites tend to have higher power outputs and may finish before in-race fueling becomes critical, yet their intensity is so high that they risk glycogen depletion and dehydration as well. Thus, nutrition strategies must be tailored to the athlete's level and race duration: elite competitors focus on topping up glycogen and perhaps minimal mid-race intake, whereas recreational athletes need a robust plan to fuel mid-race and stay hydrated to avoid “hitting the wall” late in the event. All strategies should account for female-specific physiology (hormonal influences, propensity for under-fueling) to ensure female athletes, whether pro or amateur, are properly fueled for these demanding competitions.

Carbohydrate Strategy

Carbohydrates are the primary fuel for high-intensity exercise and thus the cornerstone of race nutrition for HYROX and similar events. Female athletes should prioritize carbohydrate intake before, during, and after these races to optimize performance and recovery[2][3]. Key components of the carbohydrate strategy include daily carb intake targets, carb-loading protocols, taper-week adjustments, during-race fueling, and post-race refueling, all calibrated to the athlete's body mass, exercise duration, and intensity.

Daily Carbohydrate Needs and Carb-Loading

Daily CHO Intake: In the training leading up to competition, female athletes should consume carbohydrates according to their training load. General sports nutrition guidelines recommend about 5–8 g of carbohydrate per kg body weight per day for moderate to heavy training, and 8–12 g/kg/day for very hard or long-duration training days[4][5]. For example, a 60 kg athlete might target ~300–480 g/day in a regular training week and up to ~600 g on long workout days. These high-carb diets ensure muscle glycogen stores are continually replenished, supporting quality training and adaptations. Notably, research shows female athletes can store glycogen as effectively as males when consuming sufficient carbohydrates (in the range of 8–12 g/kg/day)[6]. If carbohydrate intake is inadequate (e.g. <5 g/kg), women may start exercise with suboptimal glycogen, and menstrual phase differences can exacerbate this – studies observed ~12–25% lower glycogen storage in the mid-follicular phase vs. mid-luteal when only ~4–5 g/kg/day was consumed[7]. The key is ensuring ample carbohydrate availability at all times, which can eliminate phase-based deficits[8].

Carbohydrate Loading (Taper Week): In the final days before a race, athletes enter a taper (reduced training volume) to rest muscles while maximizing glycogen stores. For events lasting ~60 minutes, a dedicated carb-load may not require many days – simply maintaining high-carb intake (~7–10 g/kg/day) for the day or two prior is typically sufficient[9]. For longer events (90–120 min), a more deliberate carb-loading phase is beneficial. Current sports nutrition consensus recommends 10–12 g/kg/day of carbohydrates for 36–48 hours pre-event to significantly super-compensate muscle glycogen[9]. For instance, a 60 kg recreational athlete could aim for ~600–720 g of carbs per day on the two days before race – which is a substantial increase over normal intake. Women often need to consciously increase portion sizes and choose compact carb sources (e.g. rice, pasta, potatoes, breads, juices) to reach these targets, since studies have shown female athletes sometimes struggle to eat enough total energy during carb-loading[10][11]. It's important to reduce fiber and overly bulky foods during this period to avoid gastrointestinal discomfort. Many female athletes find it useful to cut back on fat intake during carb-load days (e.g. <20% of calories) so they can consume more carbohydrates without exceeding caloric needs or feeling excessively full[12]. As long as energy intake remains adequate, women can achieve glycogen stores comparable to men[6]. In practice, that means emphasizing high-GI, easily digestible carbs (white rice, white bread, pasta with low-fiber sauce, ripe bananas, pancakes with syrup, sports drinks) in the 2 days pre-race, and not worrying about a small increase in scale weight – any extra weight is mostly water bound to stored glycogen, which will fuel the race.

Menstrual Cycle Considerations in Carb-Loading: Hormonal fluctuations can slightly alter how women metabolize carbs. Higher estrogen in the luteal phase tends to promote fat utilization and can spare glycogen to a degree, but some studies (McLay et al. 2007, Walker et al. 2000) suggest that heavy carb-loading in the luteal phase might not boost glycogen quite as much as in follicular phase[13]. However, when female athletes consume high carbohydrate levels (e.g. ~8–10 g/kg), phase differences largely disappear[8]. Thus, rather than adjusting carb amounts drastically by cycle phase, it's more important that a woman meets the general carb intake goals. One practical tip is to schedule the most aggressive carb-loading when it best fits the training schedule and race date – if a race happens to fall in the follicular phase (low hormone), ensure sufficient carbs to counter any slightly higher glycogen use; if it's in the luteal phase (high hormone), be mindful that you may feel more bloated or have a lower appetite due to progesterone's effects[14], but you still need to fuel. In any case, adequate carbohydrate is the priority, and female athletes may even want to prioritize carb-rich foods during the follicular phase of training when glycogen storage might lag if intake is marginal[15].

Pre-Race Meal and Glycogen Top-Off

In the hours leading up to the race, consuming a carb-rich, low-fiber meal helps top off liver and muscle glycogen after an overnight fast. Standard endurance nutrition guidelines advise ~1–4 grams of carbohydrate per kg body weight in the 1–4 hours before exercise[16]. This means, for example, a 60 kg athlete should eat about 60–240 g of carbs in the 4 hours prior, with the exact amount depending on what she tolerates (closer to 1 g/kg if only 1 hour before, up to 4 g/kg if 4 hours before). In practical terms, 3–4 hours before race start is ideal for a substantial meal: about 2–3 g/kg of carbs (e.g. ~120–180 g for a 60 kg athlete) from easily digested foods, plus a moderate amount of protein and minimal fat. Good pre-race breakfast options include oatmeal with a banana and honey, a bagel with a thin layer of peanut butter and jam, toast with egg whites and fruit, or a fruit smoothie with some yogurt – all emphasizing carbohydrates. This meal should also contain ~15–25 g of protein to help sustain satiety and prevent muscle breakdown, but avoid excess protein or fat which slow gastric emptying[17]. Fiber should be limited (choose low-fiber versions of grains and peel fruits) to reduce risk of GI distress during the race.

Hydration begins well before the starting gun. Athletes should aim to be euhydrated (fully hydrated) by race time. A general guideline is to drink ~5–7 mL of fluid per kg body mass about 4 hours pre-event[18][19]. For a 60 kg woman, this is roughly 300–420 mL (about 10–14 ounces) of fluid, e.g. water or a sports drink, consumed upon waking or with breakfast. Including a bit of salt (around 300–600 mg sodium) in this pre-load – either by choosing an electrolyte drink or adding a pinch of salt to food – will help the body retain the fluids[20]. About 2 hours before the race, she can top up with another ~3–5 mL/kg (~180–300 mL for 60 kg) if urine is still dark or if she hasn't urinated, to ensure full hydration[18]. The goal is pale yellow urine and no feelings of thirst. Caffeine intake is often part of pre-race routine as well (discussed under Supplements), typically taken ~60 minutes before competition to allow it to peak in the bloodstream by start time[21][22].

In the 60–90 minutes before the race, many athletes like to have a small top-up snack to keep blood sugar levels steady. About ~0.5–1 g/kg of quick carbs (30–50 g for most) is sufficient[23]. Examples include a banana (≈30 g carb), a small energy bar or two low-fiber fig cookies, a handful of pretzels, or ~250 mL of a sports drink (which provides carbs plus fluid). This snack should be low fiber, low fat, and familiar. Its purpose is to elevate blood glucose and insulin slightly, topping off liver glycogen without causing GI issues. Female athletes sometimes avoid eating too close to exercise for fear of nausea; if nerves make solid food hard to stomach, sipping a carb-rich drink or sucking on energy chews can work as alternatives.

Final 15 minutes: Right before the start, athletes may choose to take optional quick fuels: for instance, some will consume a gel (~20–25 g carbs) with a few sips of water 10–15 minutes pre-race. Others prefer just a last swig of sports drink or even a carbohydrate mouth rinse (swishing a sugary fluid in the mouth then spitting it out) – the latter has been shown to trick the brain into reducing perceived effort in high-intensity efforts <1 hour[24][25]. The decision to ingest vs. rinse depends on how long the race is and how well the athlete tolerates intake; in events ~60 minutes, a mouth rinse can give a performance boost without risking GI load, whereas in longer events, ingesting that gel provides additional fuel that will become available as blood glucose during the second hour. Practice is crucial – athletes should trial their pre-race meal and snacks in training under race-like conditions (early morning hard runs, for example) to confirm their plan sits well.

Fueling During the Race

During competition, the goals of fueling are to preserve blood glucose, delay the depletion of muscle glycogen, and sustain high-intensity output. How much and what type of carbohydrate to consume during a race depends on its duration and the athlete's gastrointestinal tolerance. For efforts around 60 minutes, taking in carbohydrate during exercise is optional but can provide a small performance benefit. Research has shown that even a relatively small dose (e.g. 20–30 g, or even just a carbohydrate rinse in the mouth) can improve performance in high-intensity exercise of ~1 hour[24][26]. Elite HYROX racers (~1 hour) often rely on their pre-race meal and start with maxed-out glycogen; they might grab a few gulps of sports drink or an energy gel mid-race if accessible, but many complete 60 minutes without consuming significant calories. Still, having carbohydrate available even in a short race can blunt fatigue. Thus, an elite may choose to take ~30 g in the middle of the race (for example, half a gel at 30 min and half at 45 min, chased with water) or use a sports drink in a hydration bottle that she can sip during less intense running segments. Even a small intake can help maintain pace in the later stages when glycogen stores are dipping[27].

For longer events (90–120 min), in-race fueling becomes more critical. Endurance nutrition guidelines indicate consuming about 30–60 grams of carbohydrate per hour during exercise lasting 1–2.5 hours[26]. This intake has consistently been shown to improve endurance performance and delay fatigue. In practical terms, aiming for ~30 g in the first hour and up to ~60 g by the second hour is a good target range. For example, a recreational HYROX athlete expecting a 1h45 race could consume one energy gel (~25 g) after 30–40 minutes, and another around 70–80 minutes, providing ~50 g in total, plus perhaps sip a sports drink (adding ~10–20 g) to reach ~60 g/h in the second hour. The exact amount should be individualized: athletes with well-trained guts might push toward the higher end (60 g/h) for maximal benefit, while those with sensitive stomachs might stick to ~30–40 g/h to avoid GI upset. It's important to start fueling early in the race, not only when fatigue hits. By the time you feel energy-depleted, it's often too late to catch up. A good rule is to ingest the first carbs about 30 minutes in (or roughly after the first 1–2 workout stations in HYROX) and regularly thereafter (e.g. every 20–30 min).

Carbohydrate Types: Not all carbs are equal when it comes to absorption at high intakes. The small intestine can only absorb roughly ~60 g of glucose (or maltodextrin equivalent) per hour via the SGLT1 transporter. To utilize higher rates (up to ~90 g/h), a combination of carbohydrates that use multiple transporters is needed[28][26]. The most common strategy is a glucose fructose blend in approximately a 2:1 ratio. Glucose (and polymers like maltodextrin) use one pathway, while fructose uses a different one (GLUT5), so together they can achieve higher total uptake. Many commercial sports nutrition products are formulated with this in mind. For instance, a typical sports drink or gel may provide maltodextrin and fructose in combination. Studies have demonstrated that a glucose-fructose mix allows oxidation of ~90 g/h of carbs and improves endurance performance in events >2–3 hours[29]. For the ~2 hour upper end of HYROX, athletes likely won't reach a full 90 g/h intake, but using mixed sugars can still aid absorption at 40–60 g/h, and may reduce the risk of GI distress compared to an all-glucose source at those doses[28]. Female athletes sometimes have concerns about stomach issues; using multiple transportable carbs and consuming them in moderate doses periodically (rather than a huge bolus at once) helps mitigate this. Additionally, hydration status affects carb absorption – some HYROX venues are indoor and climate-controlled, but the effort is intense so dehydration can occur, which in turn slows gastric emptying. Thus, pairing carbohydrate intake with fluid intake is wise (e.g. taking gels with a few gulps of water).

Logistics: Unlike cycling races, HYROX/CrossFit events don't always facilitate easy fueling on the go (there are no “aid stations” per se, though athletes can have water bottles or pick up drinks in designated areas). Athletes should plan how they will carry or access fuel: common strategies include tucking gels in sports bra straps or wearing a waist belt. Gels and chews are convenient because they're compact; a downside is they can be extremely sweet – some athletes experience “flavor fatigue” or slight nausea from the sweetness at high heart rates. In those cases, alternating a gel with a few bites of a more neutral carb (e.g. a bite of banana or an energy bar piece if available at a transition) could help. However, solid foods are generally harder to handle at race intensity; most athletes rely on fluid or semi-fluid carbs during HYROX. A sip of a sports drink every kilometer or a gel between stations is a typical plan.

For CrossFit-style competitions, the situation differs: individual WODs are usually too short (<15–20 min) to ingest anything. The focus there is on inter-event fueling rather than during-event. Athletes should consume carbohydrates and fluids in the windows between multiple WODs in a day. For example, a CrossFit athlete in a competition might drink a recovery shake (with carbs) immediately after one event, and sip a sports drink or eat a quick carb snack 30–60 min before the next event. The overall goal across the day is similar: achieve ~30–60 g of carbs per hour of competition time. If a CrossFit athlete has a longer event (say a chipper or endurance event lasting ~60 min), then the same during-exercise principles as HYROX apply: small carb intakes to maintain intensity.

Electrolytes and Fluid During Race: Even a well-loaded female athlete has limited glycogen (perhaps ~400 g in muscle and ~80–100 g in liver). Consuming carbs as above protects these stores. But equally, hydration must be managed. During HYROX, athletes sweat from both running and the intense workouts. Women generally have lower sweat rates than men, but they can still lose a significant amount of fluid in 1–2 hours of all-out effort. A dehydration >2% body weight can impair performance, especially cognitive and heat-regulation aspects[20]. Therefore, drinking during the race is important, particularly for recreational athletes on the course for 90 minutes. Aim to drink whenever there's a natural break or during a run segment. A good guide is ~150–250 mL every 15–20 minutes (approximately 0.6–1.0 L per hour) for sustained high intensity, adjusted to thirst and environmental conditions. Be careful not to over-drink; hyponatremia (low blood sodium) can occur if one drinks excessive plain water. Using a sports drink that contains electrolytes (or water plus separate electrolyte tablets) helps maintain sodium levels. For events around an hour, fluid needs might be ~0.4–0.8 L/hour[30]; for longer events, or if the athlete tends to sweat a lot, err toward the higher end and ensure there is sodium ~0.5–1 g per liter in the fluids. Women in the luteal phase may have a higher core temperature and start sweating earlier, so they might subjectively feel the need to drink more; listening to those cues is wise. In summary, plan to drink even if indoors: small, frequent sips to tolerance.

Post-Race Carbohydrate Needs (Recovery)

After crossing the finish line, the priority shifts to rapid recovery, especially for athletes who may have another event soon (e.g. multi-event competitions) or who want to optimize training recovery post-race. Intense hybrid races deplete glycogen and inflict muscle damage; proper refueling mitigates these effects. In the immediate recovery window (within ~30 minutes of finishing), female athletes should consume carbohydrates to start replenishing glycogen, and protein to kick-start muscle repair. A common guideline is ~1.0–1.2 grams of carbohydrate per kg body weight in the first hour after exercise (often split into an initial feeding at 0–30 min and another at ~60 min)[31][32]. For a 60 kg athlete, this means about 60–72 g of carbs as soon as possible post-race – for example, a recovery drink, two pieces of fruit, or a couple of energy bars – and repeating a similar amount an hour later. If such a large intake is not feasible (appetite can be suppressed right after intense exercise), adding some protein allows a slightly lower carb dose to still be effective. In fact, consuming 0.8 g/kg/hour of carbs 0.2–0.4 g/kg/hour of protein can enhance glycogen re-synthesis on par with 1.2 g/kg of carbs alone[32][33], while also providing amino acids for muscle repair. Practically, this could look like a 60 kg athlete having ~50 g carbs ~15 g protein in a shake right after finishing (e.g. a 500 mL chocolate milk or a formulated recovery beverage), which provides a 3:1 or 4:1 carb:protein ratio, and then eating a solid meal an hour or two later.

For female athletes, this recovery phase is crucial not only for performance adaptation but also for health. Women are at risk of low energy availability if they delay refueling (this can lead to hormonal disruptions/RED-S). Hence, coaches and nutritionists stress the “golden half-hour” after exercise: ingest something carb-rich and protein-rich even if it's just a snack or liquid, especially if the athlete finds solid food unappealing right after exercise. Good options include chocolate milk, yogurt with fruit, a smoothie with whey protein and banana, or a sports recovery shake or bar. This is followed by a more substantial meal within 2 hours containing a balance of carbs (to fully restore glycogen by end of day), protein (for continued muscle protein synthesis), and some fat and micronutrients (to support overall recovery processes). For example, an early-afternoon race could be followed by a 4 pm smoothie (quick carbs protein), then a 6 pm dinner of rice, lean meat, and vegetables.

Hydration recovery is also part of this phase: athletes should aim to drink about 150% of the fluid weight they lost during the race over the next few hours[20]. If an athlete lost 1 kg body mass, that's ~1.5 L of fluids to drink, ideally with sodium (through a sports drink or salty foods) to expedite rehydration. Female athletes should not be shy about using electrolyte drinks here – after competition, rehydrating effectively can help prevent headaches, fatigue, and in the case of multi-day events, will set them up ready to perform again.

In summary, an evidence-based carb strategy for these races is: maximize glycogen beforehand (through daily high-carb intake and taper phase carb-loading), ensure a carbohydrate-rich pre-race meal, fuel during exercise according to duration (~30–60 g/h with appropriate forms), and aggressively refuel and rehydrate after the finish. This approach benefits both elite and recreational female athletes, with adjustments in quantities to fit body size and level.

(See the Fueling Timeline table at the end of the report for a summarized schedule of carb, protein, and fluid intake around the race.)

Gut Training for Fuel Tolerance

High-intensity hybrid races pose a nutritional challenge: athletes need to consume carbohydrates and fluids to sustain performance, but the stress of intense exercise can cause gastrointestinal (GI) discomfort. Especially in females (who may be more prone to GI issues around menstrual cycle or when anxious), there is a risk that taking in gels or drinks could lead to bloating, cramps, or nausea. The good news is that the GI tract is trainable – just like muscles adapt to training, the gut can adapt to handle nutrition during exercise[34]. “Gut training” refers to systematically practicing fueling strategies during training sessions so that on race day, the athlete's stomach and intestines are accustomed to the volume and type of intake they will use in competition.

Key adaptations from gut training include: improved gastric emptying (the stomach learns to empty fluids and foods faster), increased intestinal carbohydrate absorption (e.g. more transport proteins like SGLT1 can be upregulated), and reduced likelihood of GI distress symptoms[35][36]. Research and athlete experience support that the GI tract is highly adaptable – for instance, regularly consuming a given carbohydrate drink during exercise can increase the intestine's ability to absorb that carbohydrate and spare the athlete from diarrhea that an untrained gut might experience[37][38]. Even short-term changes (a few days of high-carb diet) have been shown to accelerate gastric emptying rates[39].

Practical Gut Training Strategies:

• Practice with race-fuel: During training sessions, especially long runs or intense workouts, athletes should consume the same type of gels, chews, or drinks they plan to use in competition[36][40]. Start with small amounts and gradually increase toward the target race intake (e.g., begin with 20 g carbohydrate/hour and work up to 50–60 g/hour over a few weeks). This progressive overload allows the GI system to adapt without overwhelming it.
• Train the timing: If an athlete intends to eat breakfast 2 hours before racing, she should occasionally do hard training sessions with a similar pre-fuel timing and composition. This helps identify any foods that cause issues and conditions her body to exercise with that meal in her stomach.
• Volume tolerance: Some athletes struggle with drinking enough during exercise because their stomach feels sloshy. Gut training can include practicing consuming larger boluses of fluid. The stomach, like a muscle, can become accustomed to holding more volume[41][42]. For example, a runner might train herself to comfortably down 200 mL at once by repeatedly doing so in training (instead of tiny sips only). There is even anecdotal evidence from competitive eaters that stomach capacity can expand with training, though athletes don't need to go to that extreme[41]!
• Fiber and FODMAP modulation: In the days leading up to a key training session where gut training is the focus, some athletes reduce high-fiber or gas-producing foods (legumes, certain fermentable fruits) to minimize baseline GI load. This can make the training GI experience more pleasant and is a dress rehearsal for a low-fiber pre-race diet.
• Identify trigger foods: Through training, athletes can discover if certain ingredients bother them. For instance, some people don't tolerate fructose well (it can cause GI upset in those with malabsorption). If a particular gel with fructose consistently causes issues in training, the athlete can switch to a different product (perhaps one with more maltodextrin or a different sugar composition). It's far better to learn this in training than on race day.

The benefits of gut training are well documented: athletes report fewer pit-stop emergencies and are able to consume the carbs/fluid they need without discomfort[43]. One study noted that a high-carb diet during training increased exogenous carb oxidation during exercise – essentially, the body got better at using the ingested carbs as fuel[44]. Another aspect is the central comfort – just knowing you've practiced fueling can reduce nerves about eating during competition, which psychologically can ease the stomach (an anxious gut is more prone to issues).

Elite vs. Recreational differences: Elite female athletes are more likely to have incorporated gut training simply due to experience; they often have sports dietitians advising them and more training hours where they can practice fueling. Many elites will do long runs or high-intensity workouts with the exact gels and drinks planned for race day, so by the time of competition their gut “knows” what's coming. Recreational athletes, on the other hand, sometimes neglect this practice – they might train on just water for convenience or due to underestimating needs, then on race day suddenly take multiple gels and experience GI distress. This discrepancy is a major reason to encourage recreational competitors to practice fueling strategy in at least a few training sessions that simulate race effort. For example, a recreational HYROX athlete might plan a 90-minute simulated race-pace workout on a weekend and use it to test eating a small pre-workout meal, taking a gel mid-workout, and drinking electrolyte fluid throughout. By doing so, she can identify any GI issues and train her gut to handle the plan.

It's worth noting that women can be subject to unique GI influences. For instance, some women experience looser bowels or more bloating in the luteal phase or during menstruation (possibly due to hormonal changes affecting gut motility). Gut training across the cycle can help a female athlete be prepared regardless of timing – she might find she needs to avoid a certain high-fiber bar when she's premenstrual, or that she tolerates sports drink better than gel on certain days, for example. Armed with that knowledge from training, she can adjust on race day if needed (e.g. stick to liquids if feeling bloated).

In summary, gut training is an essential component of race prep: it improves carbohydrate delivery, fluid uptake, and reduces the risk of GI upset[34]. The motto is “nothing new on race day” – and that applies as much to your nutrition as to your running shoes. Practice makes comfortable!

Female-Specific Considerations

Designing nutrition strategies for female athletes requires understanding both physiological and behavioral factors that differentiate women from men. While many foundational principles of sports nutrition are similar for both sexes (e.g. carbs fuel muscles regardless of gender), there are important nuances for women related to hormonal fluctuations, metabolism, and sociocultural factors.

Carbohydrate Metabolism Across the Menstrual Cycle

Female sex hormones influence substrate utilization. In general, women oxidize a higher proportion of fat and less carbohydrate during submaximal exercise than men do at the same relative intensity[3]. Estrogen is partly responsible for this “glycogen-sparing” effect – it upregulates enzymes that favor fat burning and can attenuate carbohydrate utilization. Practically, this means a trained female athlete might rely slightly more on fat stores at a given pace compared to a male, potentially stretching her glycogen a bit further. It also means women often have a slightly lower respiratory exchange ratio (RER) during endurance exercise, indicating more fat oxidation[3]. This effect is most pronounced when estrogen is high (late follicular phase around ovulation, and mid-luteal phase) and less so when estrogen is low (early follicular, i.e. during menstruation). Progesterone, however, opposes some of estrogen's effects and can increase protein breakdown and resting metabolism.

Despite these differences, female athletes still depend on carbohydrates for high-intensity performance. HYROX and CrossFit are predominantly high-intensity; they rapidly demand glycogen. The fat utilization advantage might help in longer, lower-intensity portions (e.g. an easier run segment for a recreational athlete), but when pushing at 80–90 % VO₂max, the body will burn through carbs regardless of gender. Therefore, women should not assume they need markedly fewer carbs because they “burn more fat.” In fact, ensuring ample carbohydrate availability is critical so that when they do tap into glycogen, they have it ready. Additionally, some studies suggest women's endogenous glucose production (via gluconeogenesis) is higher in the follicular phase than luteal[45], which could mean they may feel flatter (lower blood sugar) in early follicular if they haven't fueled adequately. The practical takeaway is to fuel proactively in all phases; any small metabolic differences can be managed by steady carbohydrate intake.

Menstrual Cycle Phases and Nutrition

Follicular (Day 1–14 roughly): The early follicular phase starts with menstruation. Many women experience cravings or increased appetite in the late luteal and menstruation period (due to hormonal shifts and possibly serotonin changes); giving in to moderate carbohydrate cravings here is not a bad thing – it can ensure adequate energy. Mid-follicular (post-period, when estrogen starts rising and progesterone is low) is sometimes considered a prime time for intense training and fueling well. Some evidence indicates glycogen storage after exercise can be a bit lower in mid-follicular vs mid-luteal if carb intake is suboptimal[7]. Thus, female athletes may benefit from emphasizing carb intake during follicular phase training and recovery, to ensure no shortfall in glycogen[15]. As estrogen peaks around ovulation, theoretical protein-sparing effects occur (estrogen may reduce protein breakdown)[46], but this is attenuated if protein intake is adequate, so no major change needed there.

Luteal (Day 15–28): In the luteal phase, both estrogen and progesterone are elevated (progesterone especially so). This phase is associated with a slight bump in resting energy expenditure (2–10% increase in metabolic rate for many women) and a tendency to rely less on carbs during exercise[47]. Some female athletes find they don't perform quite as well in late luteal, potentially due to higher core temperature, possible fluid retention (progesterone can cause ~0.5–1.5 kg water retention and diuretic effect on plasma volume[14]), and greater susceptibility to catabolize protein for fuel. From a nutrition standpoint, in the luteal phase women might ensure they are well-hydrated and consume slightly more electrolytes, since plasma volume can drop and sweat sodium losses might relatively increase[14]. They might also need to consciously consume carbs during exercise to compensate for the body's lesser inclination to use carbs (i.e. force the issue by supplying exogenous carbs). It's also wise to be attentive to recovery in luteal – higher progesterone can increase muscle breakdown, so getting enough protein and carbs after sessions is key.

Menstruation: Some athletes worry about racing during their period. From a fueling perspective, menstrual bleeding causes iron loss – women should consistently ensure adequate iron in diet or supplements (see below) to avoid anemia, which would impair endurance[48]. There's no strong evidence that women need to eat differently during their period beyond listening to their bodies: if energy is low, maintain carb intake; if experiencing GI upset (some get menstrual-related GI cramping or loose stool), stick to bland, easily digestible foods around training (which is similar to normal race-week low-fiber strategies).

It must be emphasized that individual responses to menstrual cycles vary widely. A recent meta-analysis found no consistent, significant effect of cycle phase on exercise performance across women as a whole[49]. Some women set personal bests during their period; others feel awful. Therefore, female athletes are encouraged to track their own cycle and how they feel, and adjust their nutrition accordingly. For example, if a woman knows she tends to get hungrier and snacky in luteal week, that's actually a sign to top off glycogen with a bit more carb (the body might truly need a few hundred extra calories then). If she knows the day of ovulation gives migraines or the day before her period causes GI issues, she can plan gentler nutrition on those days (maybe more liquids, or foods that are comforting). Flexibility and personalization are the name of the game.

Importantly, there is not yet enough evidence to support rigidly periodizing nutrition by menstrual cycle (e.g. dramatically cutting carbs in one phase and loading in another) beyond these modest adjustments[50]. The primary risk is under-fueling if one misapplies such strategies. For instance, some sources have advised “eat more fat, less carbs in luteal because you burn more fat” – doing so could leave a woman under-fueled for high-intensity training. A safer approach supported by current science is to keep a high-quality, high-carb diet throughout, with minor tweaks (extra salt/fluid here, extra snacks there) based on symptoms and phase.

Oral Contraceptives (OC) and cycle suppression: Women on combined oral contraceptives or other hormonal birth control experience an artificial hormone pattern (or even flat levels if on continuous regimens). OCs generally raise estrogen and progestin steadily, which might mimic some luteal characteristics chronically (e.g. slightly higher baseline fat use, potential slight fluid retention). Studies on OC impacts show mixed results, but overall any differences in training adaptation or fuel use are modest[49]. Nutritionally, an OC user can follow the same principles – focus on carbs and protein around workouts – without needing to cycle-sync. She might not have the natural signals like a period or ovulation symptoms to cue adjustments, so listening to general fatigue or hunger signals is important. Some evidence suggests OC use could affect things like caffeine metabolism (estrogen can slow caffeine clearance) – so an OC user might find caffeine effects last longer, which is a consideration (she might take her caffeine a bit earlier to avoid late-race jitters, for example).

Red-S and Under-Fueling Risks

A critical consideration for female athletes is avoiding Relative Energy Deficiency in Sport (RED-S), the broader syndrome encompassing the Female Athlete Triad (energy deficiency, menstrual dysfunction, bone loss). Female athletes, especially in aesthetic or weight-conscious sports, have higher rates of disordered eating and chronic under-fueling[48]. In hybrid sports like HYROX and CrossFit, a strong, lean physique is often idealized, which can put pressure on women to restrict intake in hopes of improving body composition. However, under-eating – particularly skimping on carbohydrates – is detrimental to performance and health. Low energy availability can lead to disrupted menstrual cycles, poor bone density, increased injury risk, and reduced strength and endurance[2]. It also impairs recovery and adaptation to training.

Nutrition plans for female athletes must explicitly guard against under-fueling. This means matching energy intake to the high energy expenditure of training, including rest days for recovery (not slashing intake on off-days too far), and creating a culture where fueling is seen as positive and necessary. Coaches and practitioners should watch for signs of RED-S: fatigue, frequent illness, loss of menstrual cycle, irritability, or declining performance. If identified, increasing caloric intake (especially from carbs and fats) and possibly reducing training load are interventions. From a nutritional counseling perspective, emphasizing the performance benefits (“eating enough will help you hit that PR, will help you finish strong instead of bonking”) can resonate with female athletes who otherwise might undereat due to weight concerns.

It's also important to address behavioural barriers: Some women may avoid intra-race fueling because they're worried about calories or bloating. Education can help overcome this – for instance, explaining that a 40 g carb gel is only ~160 kcal (minimal relative to overall expenditure) but can be the difference between a strong finish and crawling in. Highlight that proper fueling leads to better training which leads to improved body composition in a sustainable way, whereas chronic under-fueling can actually cause muscle loss and fat retention due to hormonal disturbances. In the GSSI Sports Science Exchange on female athletes, one key point was that nutrition plans should foster a positive relationship with food and body image[51]. Female athletes perform best when they view food as fuel and recovery, not as the enemy.

Iron and Micronutrients

Female athletes have unique micronutrient needs. Iron is especially crucial, as women lose iron through menstruation and are more prone to iron deficiency anemia. Endurance training also increases iron losses (foot-strike hemolysis, sweat iron, etc.), and about 30–50% of female endurance athletes may have low iron stores[48][52]. Adequate dietary iron (red meat, leafy greens, legumes, fortified cereals) and possibly iron supplementation under medical guidance are often needed. An iron-depleted athlete will struggle with oxygen delivery and feel fatigued. Vitamin D, calcium, and magnesium are important for bone health, especially if menstrual function is impaired from low energy. Female athletes should ensure they get enough calcium (~1000–1300 mg/day) and vitamin D (through sunlight or supplements) to support bone density.

Menstrual cycle tracking can aid nutrition in subtler ways too: for instance, if a woman knows she's consistently iron-deficient, she might schedule iron blood tests in early follicular (when not on her period but low hormone) for a baseline, and ensure increased iron intake around menses. Or if using an IUD that causes heavier periods, she might be extra vigilant on iron and recovery foods.

In summary, female-specific nutrition considerations center on maintaining energy balance, adjusting for hormonal effects as needed, and safeguarding health (menstrual function, bone, iron status). By focusing on these, we can tailor the general strategies to a female athlete's needs. A well-fed female athlete with regular cycles (or stable hormonal health), robust iron levels, and a positive fueling mindset is primed to perform at her peak in HYROX, CrossFit, or any arena.

Protein and Fat Requirements

While carbohydrates steal the spotlight for fueling, protein and fat play supporting yet vital roles in a female athlete's diet – for recovery, adaptation, and overall health. The taper week and race day nutrition should include adequate protein for muscle repair and moderate fat for satiety and nutrient absorption, even as carbohydrate proportion increases.

Protein Needs for Female Athletes

Daily Protein Intake: Female athletes require protein intakes similar (per kg body mass) to male athletes to support muscle maintenance and remodeling[53]. Current evidence and consensus guidelines recommend about 1.4–2.0 g of protein per kg of body weight per day for physically active individuals, including those doing strength and endurance training[54][55]. This range covers the needs for both endurance (lower end ~1.2–1.6 g/kg) and strength/power (upper end ~1.6–2.2 g/kg) athletes. Hybrid athletes (like those in CrossFit or HYROX who do both endurance running and strength exercises) typically aim for the middle-to-upper part of this range, around 1.6–2.0 g/kg/day, to ensure muscle recovery from heavy lifts and high-intensity intervals. For example, a 60 kg female athlete might target ~95 g to 120 g of protein daily. During periods of intense training or when in a calorie deficit (if trying to lose body fat), protein needs could skew higher (even 2.3 g/kg or more) to prevent muscle loss, but in general 2.0 g/kg is plenty for most female athletes when energy intake is adequate.

Importantly, research has not found women to need less protein; in fact, some studies suggest women might oxidize less amino acids during exercise (estrogen's protein-sparing), but when energy is low or in luteal phase, protein breakdown can rise[56]. Thus the margin of safety by aiming for ~1.6 g/kg is prudent. Distributing protein evenly is also key – female athletes should consume protein in moderate doses (20–30 g) every 3–4 hours, including in the pre- and post-workout windows[57][58]. This stimulates muscle protein synthesis (MPS) repeatedly and effectively supports training adaptations.

During the taper week, protein intake should remain in this optimal range. There is a misconception that one should cut protein when carb-loading (to make room for carbs). While it's true the percentage of calories from protein will drop when eating 70% carbs, the absolute protein grams should stay constant or even slightly elevated to aid in muscle recovery as training load decreases. Aiming for the higher end (e.g. ~2.0 g/kg) during taper ensures muscles have all they need to repair micro-damage from the preceding training block and be ready for race strain[53]. For instance, if an elite female normally ate ~1.6 g/kg, she might bump to 1.8–2 g/kg in taper (mostly by inclusion of protein in each meal) which also can help control appetite on lower training days while carbs are very high.

On race day, protein plays a minor role in energy but is still important in meals to prevent hunger and provide amino acids for any muscle stress. The pre-race breakfast should have some protein (15–25 g, like eggs or yogurt) – this helps with satiety and can stabilize blood sugar[17]. Avoiding excessive protein right before exercise is recommended solely because it can cause GI delay, not because protein itself harms performance. During the race, protein intake is not needed (and not recommended, as it could cause GI issues at high intensity with no immediate benefit). One exception might be ultra-endurance scenarios or a multi-event day where some protein in between events could aid in staving off muscle breakdown – but in ~2-hour races, focus on carbs during the event and save protein for recovery.

Post-race (Recovery) Protein: Consuming protein soon after the race is crucial for muscle recovery. Aim for about 0.25–0.4 g/kg of protein in the recovery meal/snack[59] – roughly 15–25 g for most women, as part of that 3:1 or 4:1 carb:protein intake[32][33]. This amount maximally stimulates muscle protein synthesis. There is no added benefit to extremely large protein doses (>40 g at once) for MPS; rather, it's better to spread protein feedings. So, a female athlete could have ~20 g protein at 30 min post-race (e.g. a protein shake or chocolate milk) and another ~20 g at 2 hours post (a full meal with chicken or tofu, etc.).

One female-specific consideration: women in luteal phase or on certain contraceptives might have elevated protein breakdown; ensuring protein in the recovery phase helps counter that. Also, vegetarian or vegan female athletes should be particularly mindful to get high-quality protein (rich in essential amino acids, especially leucine which triggers MPS). Plant proteins are often less bioavailable, so a vegan might aim for the higher end (2.0 g/kg) and include leucine-rich sources (soy, quinoa, or supplementation with branched-chain amino acids if needed). Overall, though, the protein requirements for female athletes are not lower than for males, and per weight, they should target the same optimal ranges[53].

Fat Requirements and Female Metabolism

Daily Fat Intake: Dietary fat is an essential component of an athlete's diet, needed for absorption of fat-soluble vitamins (A, D, E, K) and providing essential fatty acids (omega-3, omega-6) that support inflammation resolution and cell membrane health. For female athletes, adequate fat is also critical for hormonal function – very low-fat diets can contribute to hormonal disturbances (e.g. amenorrhea). General sports nutrition guidelines suggest fat intake around 20–35% of total calories, or roughly 1–2 g/kg body weight per day, tailored to individual preference and energy demands[12]. In practice, many endurance athletes consume ~1 g/kg (which for a 60 kg woman might be ~60 g fat/day, about 30% of a 3000 kcal diet). During heavy training, females shouldn't let fat drop too low (<~0.8 g/kg) for prolonged periods, as it might impair vitamin absorption and could affect mood and satiety.

Fat intake can be periodized with training to some extent: on ultra high-carb load days, fat might naturally be at the lower end (~20% of calories) to accommodate all the carbs, as seen in taper week guidelines where one might temporarily reduce added fats[60][61]. That's fine for a couple of days, but not as a long-term diet. During normal training, including healthy fats (avocado, nuts, seeds, olive oil, fatty fish) in meals helps female athletes meet caloric needs and support recovery (omega-3 fats, for instance, have anti-inflammatory effects that may aid recovery from intense workouts).

Fat Oxidation in Females: As noted, women tend to oxidize a bit more fat at a given intensity than men. This is partly advantageous in endurance – sparing glycogen for later – but it doesn't replace the need for carbs in high-intensity bursts. Some coaches might think, “Women burn more fat, should they eat more fat?” The evidence does not support high-fat, low-carb diets for female performance; actually, low-carb high-fat diets have been shown to impair the ability to train at high intensities in both women and men[62][63]. A short-term study in female athletes found that 10% reduction in carbs hurt performance in a time trial[64], whereas raising carbs improved it[65], highlighting that carbs remain the limiting fuel for intense efforts. So while a female body is metabolically adept at utilizing fat, athletes shouldn't switch to a ketogenic or very high-fat diet if performance is the goal – it would blunt the high power output needed in CrossFit WODs or sprint between HYROX stations.

That said, within a balanced diet, women can trust their hunger for fats. Some female athletes naturally consume slightly more fat than male counterparts (possibly due to gender differences in food preferences or satiety responses). As long as total energy and carbs are sufficient, a moderate fat intake is absolutely fine. For instance, an elite female doing heavy training might eat 90 g of fat on a 3000 kcal diet (~27%), whereas a smaller recreational female on 2200 kcal might have ~70 g (also ~28%). These are within healthy ranges.

Race Day Fat: On race day itself, immediate pre-race and during-race intake should be low in fat, because fat lingers in the stomach and can cause GI issues when combined with intense jostling. Athletes avoid foods like cheese, bacon, sausage, fried items, creamy sauces, etc. in the pre-race meal, sticking instead to low-fat choices (e.g., if having oatmeal, maybe use a little skim milk or almond milk rather than whole milk and save the peanut butter for post-race). During the race, avoid fats entirely (no nut butter or chocolate bars mid-race!). After the race, once intensity has ceased, reintroducing some fat in the next big meal is fine – it can help satiety and taste, ensuring the athlete eats enough overall. For example, post-race dinner might include a hearty serving of salmon or a drizzle of olive oil on pasta for flavor and nutrients.

Realistic Examples: Elite vs Recreational

To illustrate, consider two athletes:

• Elite HYROX Athlete (Level 3): 65 kg body weight, training ~15 hours/week (mix of running, strength, HIIT). She might consume ~3000 kcal/day. Using the guidelines: perhaps ~7 g/kg carbs during regular training (~450 g/day), ~1.8 g/kg protein (≈120 g/day), and ~1.2 g/kg fat (~80 g/day) which is ~30% of calories. During taper, she increases carbs to ~10 g/kg (650 g/day = ~2600 kcal from carbs) for two days, dropping fat to ~50 g (to keep total kcal reasonable) and keeping protein ~110–120 g. On race day, she eats a high-carb breakfast (~150 g carb, 25 g protein, <10 g fat), fuels mid-race with ~40–50 g carbs (since she's done in an hour), then afterward diligently gets 70–80 g carb 20 g protein in recovery and resumes a normal balanced diet by evening. This athlete likely has very little fat during the 24h around the race (maybe 15% of intake on race morning) but returns to ~30% fat diet in the following days.
• Recreational Athlete (Level 1-2): 60 kg body weight, training 5–6 hours/week. Suppose she eats ~2100 kcal/day normally. If she follows sports nutrition advice, that might be ~5 g/kg carbs (≈300 g = ~1200 kcal), ~1.5 g/kg protein (≈90 g = 360 kcal), and the rest from fat (~600–700 kcal, ~65–75 g fat). In reality, many recreational athletes under-eat carbs – perhaps only 3–4 g/kg – which could leave her low on glycogen. By learning from performance nutrition, she could increase to ~5–6 g/kg on heavy training days (ensuring recovery) and plan a carb-load of ~8 g/kg (≈480 g) for 1–2 days pre-race[9]. That's ~1920 kcal from carbs; if she keeps protein ~90 g (360 kcal) and lowers fat to ~40 g (360 kcal) during carb-load, her total intake might be ~2640 kcal those days – higher than usual, but appropriate for saturating glycogen. This might cause a slight weight uptick from water, but she'll feel the benefit in the latter part of her 2-hour race. During the race, she aims for ~30–40 g carb/hour since her intensity is a bit lower (she might only manage 1 gel per hour plus sports drink sips). Post-race, she focuses on ~1.0 g/kg carb (60 g) 20 g protein immediately[32][33], knowing she might not have much appetite, she chooses a fruit smoothie with whey or a recovery shake. Later, when celebrating finishing, she can resume her normal diet (which includes healthy fats and proteins).

In both examples, note that protein is fairly constant (the range 1.5–2 g/kg) and fat intake is adjusted mainly to allow high carbs when needed but otherwise kept moderate. Female athletes should avoid chronically low-fat diets (<20% kcal) as that can interfere with menstrual hormones and recovery[12]. Including sources of omega-3 (flaxseed, chia, fish) is beneficial for anti-inflammatory effects and possibly menstrual pain reduction.

Finally, women often ask, “Won't eating all these carbs make me gain weight?” It's crucial to clarify the difference between acute glycogen-water weight and actual fat gain. Carb-loading can add 1–2 kg of water weight (each gram of glycogen stored binds ~3 g of water). This is not fat and will be utilized during the race (hence weight often drops after the race). Skipping the carb-load might keep the scale number slightly lower, but at the cost of performance and potentially greater fatiguing (and ironically, poorly fueled athletes sometimes overeat sugary cravings later due to low glycogen, which can contribute to fat gain). Well-fueled female athletes can train harder and lean out through increased training intensity if needed, rather than by restrictive dieting. So, meeting protein and fat needs while not skimping on carbs is actually conducive to optimal body composition and performance.

Supplementation

Beyond whole foods, certain dietary supplements can provide performance benefits for hybrid athletes. It's important that any supplement use be evidence-based, properly dosed, and tested for personal tolerance (especially for female athletes, who may have different sensitivities or smaller body size requiring dose adjustments). Here we review key ergogenic aids relevant to HYROX/CrossFit, focusing on caffeine, beta-alanine, creatine, sodium bicarbonate, and nitrates. We also address hydration and electrolytes in this context. These supplements have been selected because they have substantial scientific support and practical applicability. Each can be used by elite and recreational athletes, though the need and extent of benefit may vary by level (elites often search for marginal gains, whereas recreational athletes should cover basic nutrition first and use supplements as a bonus).

A quick note on safety: Female athletes should ensure any supplement is third-party tested (NSF Certified for Sport or similar) to avoid contaminants or banned substances. Also, certain supplements (like high-dose caffeine or bicarbonate) can have side effects – starting at a lower dose and trialing them in training is essential. The following are general recommendations with typical effective doses.

Caffeine

Caffeine is one of the most well-established performance enhancers. It is a stimulant that works by blocking adenosine receptors in the brain, reducing perceived exertion and pain, and increasing alertness[66][67]. For endurance exercise and repeated high-intensity efforts, caffeine reliably improves performance in both men and women[67][68]. It can help athletes sustain target pace longer and may also aid in activities requiring concentration and coordination (helpful in complex CrossFit movements under fatigue).

Dosing: The consensus effective dose is 3–6 mg per kg body weight, taken about 30–60 minutes before exercise[67][21]. Higher doses (9 mg/kg) do not confer greater benefits and carry a much higher risk of side effects[69][70]. In fact, studies indicate that even low to moderate doses (~2–3 mg/kg) can be ergogenic for many individuals, with less jitteriness[70]. For a 60 kg female, 3 mg/kg is 180 mg of caffeine (roughly the amount in a strong 12 oz coffee). 6 mg/kg would be 360 mg (like a very large coffee or two caffeine pills). Many female athletes find ~3–4 mg/kg sufficient to get a boost without feeling overly stimulated.

Timing: Consuming caffeine ~1 hour pre-event is standard[22], as caffeine reaches peak blood levels in 45–60 min[21]. If using tablets or concentrated caffeine (anhydrous), 40–60 min is adequate. If drinking coffee, one might take it ~60 min prior to account for slower absorption from a beverage (plus the potential diuretic effect – though caffeine's diuresis is mild during exercise). In longer events (>1.5–2h), some athletes ingest caffeine during (e.g. caffeinated gels or coke) to maintain its effect later. However, for ~1–2h races, a single pre-race dose is usually enough to cover the event.

Women-Specific Considerations: Research shows caffeine is effective in women too, improving endurance and high-intensity performance[71][70]. There is no evidence women need a different mg/kg than men. One consideration is body mass – since women on average weigh less, the absolute dose in mg will be less (e.g. a 50 kg woman at 5 mg/kg is 250 mg; a 80 kg man is 400 mg). Another factor: oral contraceptives (and the luteal phase's high progesterone) can slow caffeine metabolism, meaning the stimulant effect might last longer in those cases[72]. Thus, a female athlete on the Pill or in luteal phase might want to avoid an extremely late dose that could affect sleep after an evening event, and be cautious with stacking caffeine (taking more during event) as it might accumulate.

Female athletes also need to be mindful of side effects: too much caffeine can cause jitters, increased heart rate, anxiety, or GI upset (since it can increase gut motility). If an athlete has a history of anxiety or palpitations, starting with a low dose (e.g. 2 mg/kg) is prudent. The good news is that caffeine at moderate doses is generally safe (up to 400–500 mg/day for adults)[73] and does not cause dehydration or diuresis in exercise to a degree that harms performance[74].

Practical use: A common protocol for a HYROX athlete might be: wake up, eat breakfast, and consume ~200 mg caffeine (via coffee or caffeine capsule) about 60–90 min before start. Some might use an energy drink or pre-workout product – but watch the sugar alcohols or excess ingredients that could cause GI issues. Others take a caffeine gel 15 minutes prior (absorption might be slightly faster sublingually or through cheeks). All approaches can work if tested. It's not necessary for an athlete to abstain from caffeine entirely prior to comp; habituated caffeine users still get performance benefits, though some research suggests a short caffeine deload (3–7 days off) might enhance responsiveness[75]. This is optional – many athletes (especially if they train early morning) prefer not to deal with caffeine withdrawal.

In multi-event competitions (CrossFit), athletes might take caffeine before the first event of the day, then possibly a smaller “top-up” (maybe 2–3 mg/kg) before a later final event, being cautious not to overdo total intake. Female athletes should also time it so it doesn't interfere with night sleep, as sleep is critical for recovery. Too much caffeine late in the day can hurt sleep quality, which is worse for performance next day than any acute benefit.

In summary, caffeine (3–6 mg/kg) is a proven aid that female athletes can harness to increase endurance, intensity, and focus[22][76]. It should be tailored to individual sensitivity: use the lowest effective dose that provides a boost. And always trial the chosen dose in a hard training session – e.g., take 200 mg before a simulated run/WOD and note how you feel – to ensure on race day it's a friend, not a foe.

Beta-Alanine

Beta-alanine is a non-essential amino acid that, when ingested, helps synthesize carnosine in muscle cells[77][78]. Carnosine is an intramuscular buffer – it soaks up hydrogen ions (H⁺) produced during high-intensity exercise, thereby delaying the drop in muscle pH (acidosis) that contributes to fatigue. Events like repeated sprints, heavy lifting circuits, or the latter half of a 1k run (when legs start to burn) are exactly when buffering H⁺ can enhance performance. By increasing muscle carnosine content, beta-alanine supplementation has been shown to improve performance in exercise bouts predominantly 1 to 10 minutes in duration[79][80], as well as to help sustain high-intensity outputs in repeated-effort sports.

Dosing: Beta-alanine is not an acute-performance supplement; it's taken chronically to load muscles with carnosine, somewhat analogous to creatine. The typical regimen is 4–6 grams of beta-alanine per day, divided into 2 or more smaller doses, for at least 2–4 weeks[81][82]. Studies have used protocols like 6 g/day for 4 weeks or 4–5 g/day for 8 weeks, and found significant increases in muscle carnosine (up to 40–80%)[83][78]. A practical approach is to take ~1.6 g, 4 times per day (total ~6.4 g) or 2 g 3 times per day, etc. Many supplement products come in 0.8–1.6 g capsules or powders to facilitate this.

Why split doses? Beta-alanine can cause a harmless side effect: paresthesia, a tingling or flushing sensation (often in the face, neck, or hands) when a large dose is taken. Doses ≥~800 mg at once may provoke noticeable tingling[84]. Splitting into ≤800 mg or using sustained-release formulations mitigates this[85][82]. The tingling isn't dangerous – some athletes even don't mind it – but it can be distracting or uncomfortable. So it's best to spread out the intake (e.g., morning, midday, evening) and/or take with food, which can also reduce the sensation.

Effects for Women: Beta-alanine research has historically involved both men and women, though fewer female-only studies exist. There's no reason to believe women respond differently biologically – muscle carnosine increases similarly given the same dose, though baseline levels can differ. One study on masters female cyclists (Baum et al. 2015) showed beta-alanine improved their cycling performance, indicating efficacy in women[86]. Carnosine levels might naturally be a bit lower in women (some limited data suggests estrogen could influence levels, but unclear). If anything, women who rely on high-intensity work could benefit just as much, for example in CrossFit WODs like “Fran” (~5 min all-out) or in repeated sled pushes in HYROX.

Beta-alanine might be particularly helpful for an athlete who finds that muscle “burn” is a limiting factor. In HYROX, events like the 100 wall balls at the end cause severe burn in legs and shoulders; having higher muscle carnosine could allow a few more reps before fatigue. In CrossFit, beta-alanine could aid short to mid-length metcons and recovery between repeats.

Usage strategy: Since it requires a loading phase, an athlete should start supplementing about 4–8 weeks before a target competition. A female athlete could take, say, 5 g/day for 5 weeks leading into the race. There's no need to take beta-alanine on race day specifically (though some pre-workout mixes include an acute dose that will cause tingles but that dose is only helping if she already loaded prior). Instead, it's about consistent daily intake. After a loading period, maintaining a lower dose (~1.5–2 g/day) can sustain elevated carnosine stores if desired.

Safety: Apart from tingling, beta-alanine is very safe. Studies up to 8 weeks show no adverse health effects besides that sensory side effect[87]. Long-term data (several months) is limited, but many athletes use it cyclically around competition seasons. Female athletes with a history of paresthesia anxiety can be reassured it's benign – and they can minimize it by dosing small and perhaps choosing a sustained-release BA product.

Who benefits most? Elite female athletes who do a lot of anaerobic work (800m runners, rowers, CrossFitters) often use beta-alanine as one of their supplements. A recreational athlete might notice less dramatic effects unless her race strategy is such that she's accumulating lots of lactic acid. However, even recreational HYROX athletes will face muscle burn in later stations. Beta-alanine's percentage improvements are generally “small to moderate” but meaningful at the margins[88][79] – on the order of ~2–3% improvement in high-intensity exercise capacity on average, with responders maybe more[79]. For an elite, 2% could be winning vs. podium. For a recreational person, 2% might be a couple minutes in a 2-hr race, which could still be the difference between feeling strong at the finish versus stumbling. So it's certainly an option, keeping in mind the commitment to a loading regimen.

Creatine

Creatine monohydrate is another extensively researched supplement that is highly relevant to the strength and power aspects of hybrid events. Creatine stored in muscles (as phosphocreatine) serves as a rapid phosphate donor to regenerate ATP during high-power, short-duration efforts (seconds to under 1 minute). By supplementing creatine, athletes can increase their muscle phosphocreatine stores, which can improve performance in repeated sprint or heavy lift scenarios and support gains in muscle mass and strength from training[22][76]. For HYROX and CrossFit athletes, creatine can help with explosive movements (e.g. sled push power, box jumps) and with repeated high-intensity intervals (less performance drop-off set to set). It may also aid in recovery between events by ensuring quick ATP replenishment.

Dosing: The standard dosing strategies are either: - Loading: ~20 g per day (split into 4 doses of 5 g) for 5–7 days, then 3–5 g/day maintenance[22]. This saturates muscles quickly (within a week). - No load: ~5 g per day consistently for ~3-4 weeks will also reach saturation, just more gradually.

Both achieve similar endpoint; the loading phase just does it faster[89][90]. Many athletes opt to load if they have a specific competition in a couple weeks; others just take 5 g/day as part of routine. For female athletes of smaller size, 3 g/day might suffice for maintenance after a load, but 5 g is a commonly used dose regardless of sex because it's easy measuring (creatine has a large safety margin, slight overconsumption isn't harmful).

Timing: Creatine timing is flexible – it doesn't provide an acute boost from a single dose; it's the saturation that matters. Some evidence suggests taking creatine with a carb/protein meal (like post-workout) may enhance uptake due to insulin spike. It's a minor detail; adherence is more important (take it when you remember daily, often post-exercise with recovery shake or at breakfast). On race day, taking creatine that morning doesn't acutely enhance performance (if you're already loaded, your muscles have it; if you're not, one dose does little). So focus on the chronic supplementation.

Effects in Women: There is strong evidence that creatine benefits women similarly to men. It's sometimes underutilized among female athletes due to misconceptions about weight gain or not wanting to “bulk up.” Creatine does typically cause a small increase in body mass (1–2% of body weight) in the initial phase, largely from water retention as muscles uptake more creatine and draw water with it[71]. For a 60 kg woman, that could be ~0.6–1.2 kg. This is not fat – it's intramuscular water and actually contributes to cell hydration (which may be beneficial in exercise, possibly even thermoregulatory). Still, some women may worry about this weight. In sports with weight classes, timing creatine loading carefully is necessary. In HYROX/CrossFit, there are no weight classes; a bit of extra water in muscles is usually not a problem and could even improve appearance of muscle fullness. The performance gains (increased strength, better repeated sprint ability) usually outweigh carrying a bit more water.

Additionally, creatine might confer some other benefits particularly relevant to women: emerging research suggests it could have cognitive benefits (improving memory, mental fatigue) and even potentially mitigate some symptoms of depression or brain fog, which is interesting for women who experience mood dips in certain cycle phases or who are vegetarian (vegetarian athletes often have lower baseline creatine stores, so they respond strongly to supplementation). Creatine also may help with bone density by allowing heavier lifting and muscle support – potentially indirectly aiding skeletal health, an area of concern if a woman has had menstrual irregularities.

Protocol for Athletes: An elite female CrossFit athlete likely is already on creatine: she might load with 20 g/day for 5 days before starting a training cycle or just take 5 g every day year-round. A recreational athlete could consider an 8-week trial: e.g., take 5 g/day for 8 weeks leading up to and through a competition and see if she notices improvement in her training (like maybe she can eke out an extra rep on heavy lifts or recover slightly faster between intervals). Most do notice improvements, especially on maximal strength and high-power endurance (like more reps before fatigue sets in).

Safety: Creatine is one of the safest supplements available. Extensive research has found no adverse effects on kidney function in healthy individuals at recommended doses[91]. The myths about kidney or liver issues have been debunked in the context of normal dosage. The only considerations: ensure adequate hydration (creatine users should drink plenty of water, which athletes generally do anyway), and some people report minor stomach upset if taking a large dose at once – if that happens, splitting the daily dose or using micronized creatine (which dissolves better) helps.

One more note: some female athletes avoid creatine fearing it will make them look bloated. The water retention from creatine is intracellular (inside muscle cells), not subcutaneous (under skin), so it typically doesn't cause a puffy look – muscles hold more water, which if anything makes them a bit larger and can enhance a “toned” look. It's not water under the skin, so it shouldn't blur definition. Of course, each body is unique, but on balance creatine's effect on body composition tends to be increased lean mass.

Thus, creatine monohydrate (3–5 g/day) is strongly recommended for athletes aiming to improve strength and repeated high-intensity performance[22][76]. Both research and anecdotal evidence show it's as effective for women as for men[71]. It's inexpensive, and for a competition like HYROX, it could help with those heavy sleds and explosive burpees when ATP demands are high.

Sodium Bicarbonate (Buffering Soda)

Sodium bicarbonate (NaHCO₃), commonly known as baking soda, is an alkalinizing agent that can enhance the body's extracellular buffering capacity. In simple terms, ingesting bicarbonate raises blood pH and bicarbonate concentration, which allows muscles to offload excess H⁺ (acid) into the blood more readily during intense exercise, thereby delaying the onset of fatigue from acidosis. This is specifically useful for exercises that rely heavily on anaerobic glycolysis – typically efforts lasting 30 seconds to 8 minutes of continuous high intensity, or sports with repeated anaerobic bursts with short recovery[92][93]. For example, an 500m all-out row, a 2-minute maximal sled push, or repeated 1-minute intervals with short rests could all produce lactic acid buildup that bicarbonate might help buffer. In HYROX, even though it's an endurance event, there are segments (like a 1 km run after a hard station) where lactate accumulates and a buffer might help maintain power. In CrossFit, events like a 3-minute Fran or repeated heats of effort definitely fall in the range where buffering is beneficial.

Dosing: The typical dose is 0.2 to 0.3 grams of sodium bicarbonate per kg of body weight[92]. For a 60 kg athlete, 0.3 g/kg is ~18 g of baking soda – a substantial amount (for reference, a teaspoon is ~5 g, so ~3.5 teaspoons worth). Some studies even use up to 0.4–0.5 g/kg in larger athletes, but 0.3 g/kg is the upper end of what is generally recommended to balance benefits vs. side effects[93].

Timing: Bicarbonate should be taken about 60–120 minutes before exercise[92]. Individuals vary in when blood bicarbonate peaks; many aim for ~90 min pre-event as a middle ground. It can be ingested all at once or split into two smaller doses separated by ~30 minutes if that improves tolerance.

The BIG Caveat – GI Side Effects: Sodium bicarbonate often causes gastrointestinal distress – common issues include bloating, stomach pain, gas, and diarrhea[93]. This is because in the stomach, bicarb reacts with stomach acid to produce CO₂ (burping) and can speed up gut motility (leading to urgency). This is the primary barrier to use. Strategies to mitigate GI upset include: - Splitting the dose (e.g., 0.15 g/kg 0.15 g/kg, 30 min apart). - Taking it with a small meal or plenty of water (to dilute it). - Using enteric-coated bicarbonate capsules (which delay release until it's past the stomach). - Using sodium citrate as an alternative (citrate also acts as a buffer with slightly less risk of GI issues, though a larger dose in grams is needed). - Some athletes “train” with bicarb in practice to adapt (some evidence suggests repeated use might improve tolerance slightly).

It's absolutely crucial that any athlete trial this in training – taking a full dose cold-turkey on race day can result in an emergency dash to the porta-potty (or worse). With practice and the above strategies, many athletes can find a protocol that is tolerable. Also, consuming the dose slowly (sipping over 10–20 minutes) rather than all at once can help.

Effectiveness: When tolerated, bicarbonate can meaningfully improve performance in high-intensity efforts. Meta-analyses show it can increase time-to-exhaustion or output in the 1–7 min range by a small-to-moderate amount (a few percent)[92]. For example, it has helped 800m runners take a second or two off, swimmers improve a 200m time, etc. In CrossFit-style workouts, studies are limited but anecdotally many athletes report being able to hang on longer in a set or feeling less burn in later rounds. For HYROX, one might expect it to help particularly in the latter stations (when acidosis is accumulating from prior work) or to enable maintaining speed in the final kilometer run.

Women-specific notes: There's no difference in mechanism for women; bicarbonate works the same physiologically. If anything, smaller individuals might better tolerate a given absolute dose because they need less (e.g., an 18 g dose for a 60 kg woman vs maybe 30 g for a 100 kg man – the man has to swallow more substance). So female athletes might find it a bit easier to ingest because their dose is, in grams, lower. That said, 18–20 g of baking soda is still quite a lot – often mixed in maybe ~500 mL of water or a flavored beverage to choke down. It has a very salty, soapy taste. Some mix it with a sports drink or something like Crystal Light to mask flavor.

Protocol example: A female athlete (60 kg) decides to use bicarbonate for a HYROX race. She has in training done a trial: taking 12 g 90 min before a 20-minute hard circuit and noticed some burping but was okay, then tried the full ~18 g split into 2 doses of 9 g at T-120 and T-90 minutes, along with a small carb snack, and got only minor cramping but performed well. So on race day, she dissolves ~9 g bicarb in a sports drink and starts drinking it 2 hours before, finishes it in 15 minutes, then takes another ~9 g in capsule or drink by 1.5 hours before. She avoids large meals in that window (just a light carb snack at 2.5h prior) to reduce GI load. She also ensures a good warm-up and a last bathroom stop before the race (sodium bicarb can cause the need to void). If all goes well, she might feel a bit of extra “buffer” during the race – perhaps she can push harder in the sled push without the same burn, or her 500m row in mid-race doesn't spike her acidity as badly, leaving her fresher for the next run.

Risk vs Reward: For recreational athletes, bicarbonate might be more trouble than it's worth unless they specifically struggle with the “lactic burn” and are chasing a performance improvement. For elites, any edge is worthwhile and many do incorporate buffering agents. It's noteworthy that a subset of people are “non-responders” or “poor responders” – they either don't see performance gain or just cannot handle the GI issues. For women with sensitive stomachs or a history of IBS, this supplement might be too risky. There's also the sodium load: ~0.3 g/kg bicarb contains about 3.5 mmol sodium per gram – in 18 g, that's ~63 mmol, roughly 1450 mg of sodium. That can contribute to bloating or elevated blood pressure transiently (not an issue if healthy, and could even help hydration-wise). But it's something to note (it's like taking a fairly sodium-rich drink; one could even count it toward electrolyte intake).

In conclusion, sodium bicarbonate (0.2–0.3 g/kg) can enhance performance in intense efforts by buffering acid[92], but it must be used carefully due to GI side effects[93]. For female hybrid athletes, it's an option to consider for competitions that have very intense components. Thorough testing and individualized titration are key – when it works, it might allow you to push through that burning sensation and keep output high in the critical moments of a race.

Dietary Nitrates (Beetroot Juice and Others)

Dietary nitrates, found richly in beetroot, arugula, spinach and others, are converted in the body to nitric oxide (NO), a molecule that causes vasodilation (widening of blood vessels) and can enhance muscle efficiency. Supplementation with nitrates (commonly via beetroot juice or concentrates) has been shown to improve performance in endurance and high-intensity continuous exercise, especially in activities lasting 5–30 minutes and in individuals who are not already highly trained in endurance[94][95]. NO can improve exercise economy (you use slightly less oxygen for a given output) and might improve blood flow to muscles, potentially aiding performance in both endurance and repeated sprint contexts.

Dosing: An effective dose of nitrate is around 6–8 millimoles (mmol) of nitrate ion per day. In practical terms, one typically consumes: - ~500 mL of natural beetroot juice (~NO₃ ~ 6 mmol), or - ~70 mL of a concentrated beetroot shot (often labeled as 400–800 mg nitrate, equating ~6–12 mmol), or - Nitrate capsules that provide standardized amounts.

Protocols vary, but two common strategies: 1. Acute: Take ~6–8 mmol NO₃ 2–3 hours before exercise (to allow plasma nitrite to peak)[95]. Most beet products are taken ~2 h prior. 2. Loading: Ingest ~6 mmol per day for 3 days up to an event (sometimes even 5–7 days for a loading phase)[95], with the last dose ~2 h before competition. Some evidence shows performance benefits from pre-loading for multiple days, potentially saturating muscle with nitrite stores.

Given HYROX is an endurance-strength mix ~60–120 min, nitrate could plausibly help the aerobic efficiency during the running segments and recovery between stations. For CrossFit, nitrates might be less directly beneficial in short events, but if there's a longer chipper or overall improvement in recovery between multiple events (there's some suggestion nitrates aid recovery of power in repeated sprints).

Women and Nitrates: Interestingly, recent research indicates there may be sex differences. For example, a 2023 study (Ortiz de Zevallos et al.) found that nitrate supplementation improved exercise economy and endurance capacity in male subjects but not in female subjects[95][96]. The female participants in that study did not see the same improvements in time-to-exhaustion. The reasons aren't fully clear – hypotheses include that pre-menopausal women might naturally have higher NO availability (perhaps due to estrogen's influence on endothelial function) or differences in oral bacteria activity that reduce nitrate, or muscle fiber type differences. Another review noted mixed results in women and that trained women might not benefit as much as men[94][97]. That said, other research has shown benefits in women, particularly if they are less well-trained or post-menopausal (when baseline NO is lower). Therefore, it's not a guarantee that nitrates will help every female athlete, but they could, and they generally won't harm performance (the exception: some highly trained athletes paradoxically didn't benefit or even had slight decrements in a few studies, possibly due to already optimized NO levels or muscle efficiency).

Protocol for female athletes: Given the uncertainty, a female athlete should trial nitrates in training to see how she feels. Many anecdotal reports from female athletes: some feel a tangible boost (e.g. “my pace at a given HR was faster after beet shots”), others notice no change. There is also the placebo effect; beet juice is famous for its red color and “superfood” image, which can psychologically boost confidence.

If she chooses to use it, a typical regimen: - Loading: drink ~250 mL beet juice (~3 mmol) twice a day for 2 days before race, and another ~500 mL (or a concentrated shot) on race morning ~2 hours prior. Or use 1 beet concentrate shot each day for 3 days, plus one before event. - Acute only: take a double-shot (~8 mmol) 2–3 h pre-event (this often suffices if she is going for simplicity).

It's important to avoid antibacterial mouthwash and gum especially around the time of ingestion, because oral bacteria are needed to reduce nitrate to nitrite in the mouth as part of the absorption pathway[95]. So an athlete should refrain from using strong mouthwash on event day or in the loading days, as that can diminish the conversion to NO (some studies showed that using antiseptic mouthwash abolished the blood pressure-lowering effect of nitrates).

Side effects: Beetroot supplements are generally safe. They can cause beeturia (red/pink urine) or red stool in many people – harmless but one should be warned (so she doesn't think she's suddenly bleeding internally!). Some people experience mild GI discomfort from the high volume of juice or the earthy taste. If prone to kidney stones, note that beets are high in oxalates – but occasional use is likely fine. The products like Beet-It shots are concentrated so less volume needs to be consumed, which helps with GI tolerance (they're about 70 mL vs 500 mL for equivalent nitrate).

Performance context: For an elite HYROX woman who's already very fit, nitrates might shave a little off her run splits or lower her RPE on the row/ski erg. For a recreational athlete who isn't as efficient, nitrates often have a bigger relative effect (studies show greater improvements in less trained subjects)[98]. So it's certainly something a recreational athlete could benefit from as well, potentially improving their aerobic capacity to get through the race with less fatigue. Given the low risk, it's worth a try.

One consideration: nitrates might slightly lower blood pressure (that's part of how they work). For an athlete with already low blood pressure or who tends to get light-headed, monitor that. Typically it's a modest effect.

In summary, dietary nitrate supplementation (~6–8 mmol via beetroot juice) is a promising strategy to improve endurance by enhancing NO availability, though results in female athletes are mixed[95][96]. It's easy to use and safe, so a female athlete can experiment with beetroot shots to see if she perceives improvements in her training. If she does, implementing a loading regimen before competition could help her eke out a better performance, particularly in the endurance aspects of hybrid racing. If she doesn't notice benefit (or finds the taste awful), she can skip it without major loss.

Hydration and Electrolytes

Though not a “supplement” in the traditional sense, a discussion of performance nutrition is incomplete without addressing hydration and electrolyte strategies, as they are fundamental to both health and performance. In fact, most sports nutrition guidelines treat fluid and sodium intake as crucial components of race prep and execution. For female athletes, considerations around hydration may include typically lower sweat rates, risk of hyponatremia if over-drinking, and potential menstrual cycle influences on fluid balance.

Pre-Race Hydration: As noted earlier, a general guideline is to ensure euhydration by consuming ~5–7 mL/kg of fluids about 4 hours before exercise[18], with additional 2–3 mL/kg at 2 hours if needed[18]. For a 60 kg woman, that's ~300–420 mL at 4h prior, and another ~150–180 mL by 2h prior if urine is still concentrated. Including sodium (~400–700 mg) in these fluids or food is wise to help retain the water and expand blood volume[20]. For example, the athlete could drink 500 mL of a sports drink or water with an electrolyte tablet (which often have ~300–500 mg sodium per tablet) with breakfast. The goal is to start the race fully hydrated but not over-hydrated (over-hydration can lead to needing to urinate frequently and even dilute blood sodium too much if extreme).

Female athletes should be aware that in the luteal phase, baseline body temperature is slightly elevated and thirst may increase; also progesterone causes some fluid to shift to tissues (bloating) and can reduce plasma volume[14]. So if a woman is in luteal phase (or on a high-hormone phase of birth control) during competition, she might need to be extra careful to pre-hydrate and perhaps consume a bit more salt to counter the progesterone-induced diuresis. Additionally, some women feel more bloated or have breast tenderness from water retention in luteal phase – although paradoxical, staying hydrated and having adequate sodium can actually alleviate some fluid retention by encouraging proper fluid turnover (dehydration can cause the body to hold onto water in tissues).

During Race Hydration: For a ~1 hour race, as mentioned, sipping water when possible is often enough. But for 90–120 min, an athlete should plan to drink. A common recommendation for endurance athletes is to aim for ~0.4 to 0.8 liters per hour of fluid, adjusting for thirst, sweat rate, and environmental conditions[30]. In cooler indoor conditions, the lower end may suffice; if it's warm or the athlete is a heavy sweater, the upper end might be needed. Women generally have smaller body mass and lower sweat outputs than men doing the same exercise, but there are female heavy sweaters too. The best way to personalize is by doing a sweat rate test in training (weighing before and after a similar workout with known fluid intake). For instance, if a woman finds she loses ~0.5 kg per hour in training, that's ~500 mL/h sweat rate; she could aim to drink ~400 mL/h (to limit dehydration to <2% body mass). If she loses 1 kg/h, that's higher (1000 mL/h), she might try to drink ~600–700 mL/h if her stomach tolerates it.

Electrolytes are critical because when you sweat, you lose not just water but sodium, chloride, and to lesser degrees potassium, magnesium, etc. Sodium is the main one to replace to avoid hyponatremia. A rough guideline is ~500–700 mg of sodium per liter of fluid for moderate sweating, and up to ~1000 mg/L for very heavy salty sweaters or in hot conditions[99]. Many sports drinks provide in the range of 300–800 mg/L. For women who often eat less salty foods, they might not have as high sodium reserves, so using a sports drink or electrolyte supplement can be beneficial. Signs of insufficient sodium during exercise include headaches, muscle cramps, nausea, or in severe cases confusion (which could be hyponatremia if over-drinking water without salt). Women have indeed been shown in some endurance events to be at higher risk of hyponatremia, possibly because they may stick to hydration plans even when their smaller bodies don't need as much, and/or they may be more cautious about drinking (some evidence from marathon data suggests female runners had higher hyponatremia incidence, often those who were slower and drank too much). To avoid that, drink to thirst plus a plan, and include electrolytes.

For HYROX specifically: Because it's often indoors and about ~1.5h max for most, a reasonable strategy is to have an electrolyte-carb drink (even a half-strength sports drink or a hydration formula) at a transition area. The athlete could quickly take a few gulps after certain stations (maybe after a draining one like sled push). Many will simply rely on aid stations if provided. But bringing one's own drink (if allowed) ensures getting both fluid and some sodium. For CrossFit comps, between WODs they should sip on electrolytes to rehydrate, especially if they sweat a lot in events (like a long chipper in the sun or an event in a sweaty indoor arena).

Post-Race Rehydration: The target is to fully restore fluid balance and electrolytes. The guideline of ~150% of weight lost (with sodium) is effective[20]. Practically, if an athlete is 60 kg before and 59 kg after (1 kg loss), she'd aim for ~1.5 L over the next few hours with some salt. Drinking too much plain water immediately can lead to rapid dilution; better to spread it out and include snacks or fluids with sodium (like a recovery drink, broth, salted pretzels, etc.). Women in general might have to be reminded to rehydrate because some are so focused on carb/protein intake that they forget fluid, or if they are petite and not feeling thirsty after an event, they might inadvertently under-drink. Monitoring urine color is an easy self-check (it should go back to light yellow within a few hours post-race).

In terms of specific products: electrolyte tablets (like Nuun, Precision Hydration, etc.) can be added to water if one prefers not to take extra carbs in fluid. Or a typical sports drink (Gatorade, Powerade, etc.) provides both (~20–30 g carb per 500 mL and ~220 mg sodium per 500 mL for Gatorade). Some newer products allow customizing sodium. For example, if a female athlete knows from a sweat test she loses a lot of salt, she might use a higher sodium mix (like 1000 mg/L). If not, a standard 18–20 mmol/L (approximately 400–500 mg/L) solution is fine.

One more female-specific note: Menstrual cramps and hydration – anecdotal but some women find being well-hydrated and having sufficient magnesium/potassium in diet can lessen menstrual cramp severity. While not directly performance-related, it's worth noting that magnesium is often lost in sweat too (in small amounts) and many women have marginal magnesium intake. Ensuring a balanced diet or a multivitamin can help there.

Overall, the hydration strategy for female athletes is not fundamentally different, but it emphasizes listening to one's body (thirst), adjusting for body size, and maintaining electrolyte balance. Women should neither under-drink (for fear of bloating) nor over-drink (due to anxiety). A good plan combined with intuitive thirst can ensure they hit the sweet spot of hydration, which supports optimal cardiac output, thermoregulation, and mental acuity during competition. It's often said: even 2% dehydration can impair performance, so this is as important as fueling[100]. Conversely, proper hydration can improve how one feels – less perception of effort, better endurance.

Finally, because hybrid events mix bursts and endurance, dehydration not only would slow running pace but could also increase injury risk (tired, cramping muscles on strength stations). Therefore, staying on top of fluids/electrolytes is part of a smart female athlete's toolkit for success.

Food Sources and Practical Fueling Strategies

Translating all these guidelines into real-world practice means choosing the right foods and products at the right times. Female athletes often juggle busy schedules, sensitivity to certain foods, or preferences for “real food” vs. engineered products. The good news is that performance nutrition can be achieved with a variety of approaches. Here we'll discuss using whole foods versus commercial sports nutrition products, give examples of each for pre-, during-, and post-race, and provide some practical tables for carbohydrate content and fueling timelines.

Real Food vs. Sports Nutrition Products

Whole Foods: These include fruits, grains, dairy, etc., that one could use to meet carb needs – bananas, dates, raisins, rice cakes, jam sandwiches, applesauce, potatoes, etc. Whole foods have the advantage of being familiar, often cheaper, and providing micronutrients and fiber (beneficial in general diet, though fiber avoided right around competition). Many female athletes appreciate the “real food” approach because it can be tastier, less processed, and avoids flavor fatigue from too many sugary gels. For example, ultra-runners often eat dried fruit or baby food pouches for variety. In HYROX/CrossFit, because events are shorter, there's less opportunity (and need) to eat a wide variety mid-event, but real foods can shine in pre-race meals and between events.

Sports Products (Gels, Drinks, Bars): These are formulated for convenience and rapid absorption. Gels and chews deliver compact carbs with minimal fiber/protein, making them easy to digest during high intensity. Sports drinks serve dual roles of hydration and fueling. Bars can be useful as pre- or post-event snacks (and some high-carb, low-fiber bars can even be nibbled during long events). The big advantage is practicality: you can carry a gel in your bra or pocket, whereas carrying a banana mid-race is less convenient. Also, products have known nutrient content – you can precisely quantify intake (e.g., one gel = 25 g carb, one packet chews = 30 g, etc.), which helps in executing a fueling plan. Many products also combine glucose and fructose in optimal ratios to maximize absorption, something not guaranteed with random foods.

Digestibility and Osmolality: Engineered products are designed to be easy on the stomach (most of the time). For example, isotonic gels (like SiS) have water in them to make them ~6-8% solutions so they empty quickly[101]. Some drinks use maltodextrin (a glucose polymer) to pack carbs with lower osmolality than simple sugar solutions. Real foods vary; something like a banana is usually well tolerated (it's mostly carbs and some fiber), whereas something like trail mix (nuts raisins) would be a bad idea mid-event due to fats/protein slowing digestion. The rule of thumb: during exercise, avoid significant fat, fiber, protein because they delay gastric emptying[102]. This is why even “natural” fueling tends to revolve around high glycemic, low-fiber items (ripe bananas, peeled peaches, boiled potatoes with salt, honey, etc.). Bars marketed for during exercise (e.g., Clif Bloks or Enervit bars) are formulated to be low in fat/fiber so they act more like concentrated carbs[102].

Taste and Preferences: Female athletes should choose flavors and textures they can consume even when heart rate is high. Some find thick gels gag-inducing – an easy fix is to go for more liquid gels or chews or a drink. Others get “flavor fatigue” with sweet stuff – sometimes a mildly salty or bland carb can be a relief (e.g., pretzels or plain rice ball during ultras). In a 2-hr race, flavor fatigue is less of an issue than in ultra events, but having a favorite gel flavor can be a small morale boost mid-race. It's often said: the best fuel is the one you will actually consume when needed. So whether that's a commercial gel or a spoonful of honey with a dash of sea salt (which some DIY athletes use), as long as the composition is right, it's fine.

Let's break down fueling by phase with examples:

• Pre-Race (night before and breakfast): Stick to familiar, carb-rich staples. For dinner, examples: a plate of pasta with a simple tomato sauce and a bit of chicken (mostly carb, moderate protein, low fat), or a rice bowl with teriyaki chicken (easy on the veggies for fiber control), or even something like pancakes with syrup if that sits well. These are high in carbs and low in fiber. Many female athletes enjoy adding some protein (tofu, chicken, fish) but keep portions moderate. Avoid super fatty foods (pizza with extra cheese, creamy Alfredo sauce, etc.) because they can cause GI sluggishness next day. For breakfast 3 hours out, something like oatmeal (made with water or low-fat milk) topped with banana and honey provides ~100 g carb, ~10 g protein, very little fat – an ideal composition[103]. Other options: bagel with a thin spread of peanut butter and jam (mostly carb, a little fat/protein), white toast with jam and a few egg whites, a smoothie with fruits and a scoop of protein (if solid food is hard). The 1–4 hours pre guideline allows flexibility: if a woman's wave is at 11 am, she might have a substantial breakfast at 7 am (e.g. cereal yogurt fruit = ~80 g carb, 15 g pro) and maybe a small snack at 10 am (like half a sports bar ~20 g carb) to top off[104].
• During Race: If using products, an athlete might take one gel around 30–45 min in and another by 75–90 min if needed. With water, of course. Or if she doesn't like gels, she could sip a carbohydrate-electrolyte drink throughout (e.g., 500 mL of Gatorade Endurance formula per hour provides ~30 g carb, 300 mg sodium). Some athletes might alternate – say drink sports drink early on, then take a gel later when intensity ramps up and mouth is too dry to chew anything. Chews or gummies are basically semi-solid gels; some find them easier to portion (you can take one chew at a time). For example, Skratch Labs chews or Clif Bloks provide ~4 g carb per chew; taking 4–5 of those over a half hour is like a gel. If one prefers more natural mid-race, small bites of a very ripe banana (maybe available at aid stations) could work – a banana ~27 g carb, but one must chew and that could be tough at high intensity. Some triathletes use baby food pouches (pureed fruit) as a natural gel alternative – those can have ~15–20 g carb per pouch. It's doable if carrying isn't an issue. In CrossFit between WODs, something like a piece of fruit or half an energy bar 30 min before next event can serve as “during-event fueling” for the day.
• Recovery: Real food shines here. A classic recovery combo is chocolate milk, which is indeed supported by research as effective for glycogen resynthesis and muscle recovery due to ~4:1 carb:protein ratio[92]. For women who may be lactose sensitive, a smoothie with almond milk, banana, and protein powder can mimic that. Other options: Greek yogurt with berries and granola (carb protein), turkey sandwich and sports drink, rice with eggs and fruit – basically a mix of carbs with some protein. If an athlete doesn't feel like eating solid food immediately, a commercial recovery shake (with ~20 g protein, ~60-80 g carb) is convenient. Some products target that, or one can DIY (e.g., blend whey protein with banana and honey). The aim is to get that 1.2 g/kg carb ~20 g protein within first 1–2 meals[31].

Let's integrate these into a table for clarity, including brand or food examples:

Table: Example Fueling Options (by timing and type):

• Night Before (Carb-Loading Dinner):
• Real Food: White pasta with marinara and 1 chicken breast (80–100 g carb, 30 g pro, low fat). Or stir-fried rice with a bit of soy sauce, veggies, and tofu (lots of rice, minimal oil).
• Note: Aim for a full plate of grains/starch. Add a little lean protein. Minimal salad or fibrous veggies. Salt the food to taste (aids hydration).
• 3–4 Hours Pre-Race (Breakfast):
• Real Food: Oatmeal made with milk, topped with banana and honey[103] (~100 g carb, 15 g pro). Plus water or sports drink.
• Real Food: Two white bagels with jam (~90 g carb, 12 g pro).
• Combo: Pancakes (3 medium) with syrup (90 g carb) and a scrambled egg or two (12 g pro).
• Sports Product: Meal-replacement shake (Ensure, Boost) that's high in carbs, plus a banana. (E.g., Ensure carbo-loaded version has ~50 g carb, add fruit for ~30 g more).
• Sports Product: UCAN superstarch shake (for those who use slow-release carbs) – some athletes prefer a formula like UCAN that gives steady glucose without insulin spike; one might mix it with almond milk. [This is a specific strategy some adopt].
• 1 Hour Pre-Race (Top-Up Snack):
• Real Food: Applesauce cup (15 g carb) 1 fig bar (20 g carb). Easily digested.
• Real Food: Half a banana (15 g) a small handful of pretzels (15 g, plus sodium).
• Sports Product: 1 sleeve of energy chews (~30 g carb) or a sports drink ~250 mL (20 g carb).
• Sports Product: Caffeine source if desired – e.g., caffeine tablet (100–200 mg) or caffeinated energy chew (like Clif Bloks with caffeine)[67].
• During Race (During Exercise Fueling for 90 min):
• Real Food: 1 ripe banana eaten in thirds (each ~9 g carb) over 30 min, plus water. (More feasible for recreational pace where one can chew).
• Real Food: Raisins (~30 g or 2 tablespoons = 20 g carb) carried in a small pack – chew a few at a time (sticky though).
• Sports Product: Energy gel (20–30 g carb each) at the targeted times (e.g., 45 min and 75 min marks)[26]. Brands: GU, SIS, Maurten (40 g carb but pricey), Honey Stinger (uses honey electrolytes). Choose flavor and caffeine as per preference.
• Sports Product: Sports drink sipped throughout, totaling ~500 mL per hour (with ~30 g carb, plus 300 mg sodium per 500 mL)[101]. E.g., Gatorade Endurance Formula or Powerade Ion4.
• Sports Product: Electrolyte drink (zero-carb) plus energy chews for carb – e.g., drink plain Nuun (no carbs) for fluid, while eating chews for carbs.
• Sports Product: Tailwind or Skratch Labs drink mix – these newer gen mixes provide ~60–80 g carb per liter with ~700 mg sodium, known to be gentle on stomach. One could fill a 500 mL bottle with it (~30–40 g carb) and aim to finish it by race end.
• Sports Product: None for <60 min events – just water or a quick swill of sports drink for mouth sensing[24] (for a 1h all-out, some elites might not consume anything, perhaps just mouth rinse with a carb solution which can trick the brain into improved performance).
• Immediately Post-Race (0–30 min):
• Real Food: Chocolate milk, 16 oz (50 g carb, 16 g pro) – a nearly ideal ratio and easy to drink.
• Real Food: Greek yogurt (170 g) with honey and a small banana (≈30 g carb, 15 g pro).
• Real Food: PB&J sandwich on white bread (40 g carb, 10 g pro, some fat – fat is okay after finish, though too much might delay carb absorption slightly; but one sandwich is fine).
• Sports Product: Recovery shake powder (e.g., Endurox R4, or MyProtein Recovery) with water – typically ~40–50 g carb, 10–15 g protein per serving.
• Sports Product: Protein bar sports drink (e.g., 20 g protein bar and 16 oz Gatorade = 36 g carb, making ~60 g carb, 20 g pro combo).
• Sports Product: Fruit smoothie from vendor – often races have food stalls; a smoothie with yogurt, fruit, and maybe whey added can give needed nutrients. Or something like Jamba Juice's recovery smoothie.
• Later Post-Race Meal (2 hours post):
• Real Food: Burrito with rice, beans, chicken (recovery and refuel – plenty of carbs in the rice & tortilla, protein in chicken and beans).
• Real Food: Pasta with lean ground turkey tomato sauce, side of chocolate milk (carb heavy and protein).
• Real Food: Stir-fry with lots of rice, veggies, tofu, and a moderate oil (carb protein, plus micronutrients).
• Sports Product: Not usually needed if normal meal is available; maybe just ensure continued hydration with an electrolyte beverage if the athlete still feels dehydrated or if she has another training/event the next day and wants to maximize glycogen (some might continue using high-carb drinks between meals).
• Sports Product: For appetite suppressed athletes, commercial high-carb recovery drinks (like Gatorade Recovery which includes some protein) can help get enough calories until hunger returns.

Finally, to help planning, here's a quick conversion chart of common carb sources:

• 1 medium banana ~ 27 g carb[104].
• 1 medium apple ~ 25 g carb.
• 1 cup cooked white rice ~ 45 g carb.
• 1 cup cooked pasta ~ 40 g carb.
• 1 slice white bread ~ 15 g, 1 bagel ~ 50 g.
• 8 oz (240 ml) sports drink ~ 15 g carb (typical 6% solution).
• 1 standard energy gel ~ 22–25 g carb (some newer ones up to 30 g).
• 1 pack of 6–8 energy chews ~ 24–30 g carb (depending on brand).
• 1 cup low-fat yogurt ~ 15–20 g carb (plus protein).
• 2 Tbsp honey or table sugar ~ 30 g carb (for mixing into fluids if needed).
• 16 oz (500 ml) cola ~ 50 g carb (some use flat Coke as a quick sugar source in ultras, though not typical for these events).
• 1 serving oatmeal (1/2 cup dry) ~ 27 g carb (plus whatever added like fruit or milk).
• 3 medjool dates ~ 45 g carb (dates are very high GI, good quick fuel if one likes them, but super sweet).
• 1 oz pretzels ~ 23 g carb (and ~500 mg sodium) – a savory carb source for after or potentially during if chewing is okay.

Female athletes can use tables like this to mix and match fueling choices. Some prefer all liquid (if GI is sensitive, liquid may empty faster, though be mindful of volume sloshing). Others get “sugar overload” and appreciate a mix of sweet and lightly salty (hence pretzels or broth in ultras, though in a ~2h race maybe not needed).

Brand Recommendations by Use-Case:

• Pre-Race: If solid food nerves are an issue, something like Ensure Pre-sport carb drink (which is essentially maltodextrin and a little protein) can be sipped. Or Maurten Drink Mix 320 (very high carb drink, 80 g per packet) consumed ~2 hours out can top off stores without bulk.
• In-Race Gels: Popular ones include SIS Isotonic (no extra water needed, good for those who can't grab water easily), GU Energy (small volume, many flavors, some with caffeine), Maurten Gel 100 (45 g carb, uses hydrogel tech; pricier but gentle on stomach – used by many elites in marathons).
• In-Race Chews: Clif Bloks (each blok ~8g carb, easy to portion), Honey Stinger chews (natural flavor, about 4g each piece, plus they have some sodium).
• Drinks: Gatorade Endurance (used in many races, higher sodium than regular Gatorade), Tailwind Endurance (a favorite among female trail runners, light taste, all-in-one carb electrolyte, customizable concentration), Skratch Labs Hydration (moderate carb, high sodium, known for real fruit flavor and lower sugar per sip so easy on gut).
• Recovery: Chocolate Milk (can't beat it for simplicity), Endurox R4 (classic 4:1 carb:pro powder), NBS Recovery or Momentous Recovery (for those who like specialized formulas with perhaps creatine, etc. included). Protein powders mixed with carb sources (like whey Gatorade, an old bodybuilder trick, effectively makes a DIY recovery drink).

One should tailor to personal tolerance: for example, if a woman finds Gatorade too sweet, she can dilute it to half strength and complement with a gel to reach carb targets, as long as she still gets some electrolytes in.

Lastly, consider packaging and convenience: women's clothing often has less storage pockets, so a strategy might be e.g. pinning a gel to waistband or using a lightweight running belt. There are gels one can tape to equipment if allowed (some triathletes tape gels to bikes; maybe a HYROX athlete can leave one at their station if rules permit).

In sum, practical fueling means planning out what you will eat and drink, and when, using a combination that suits your GI comfort and taste, while meeting the carb, protein, and fluid targets outlined. There's flexibility – e.g., 60 g carbs/hour could be 1 gel 500 ml sports drink, or 2 gels water, or a handful of dates electrolyte water, etc. Female athletes should practice with multiple options to have a toolkit: maybe in cool conditions she prefers solid chews, but in a really intense hot race she'll do just liquids and gels.

To illustrate coherence of all this information, the following table summarizes a recommended race-week and race-day nutrition timeline, integrating carbs, protein, fluids, and supplements we've discussed:

[22][76]

Time (relative to race) and Nutrition Plan & Examples

T-48 to 24 hours (Carb Load)

Emphasize high-CHO intake (~8-10 g/kg/day)[9]. Base meals on starches: e.g., pasta, rice, bread, potatoes. Reduce high-fiber veggies, opt for easily digestible carbs (pancakes, rice crackers, etc.). Keep protein moderate (~1.5 g/kg) and fats low (<20% kcal) to aid glycogen storage. Ensure total sodium ~3-5 g over the day (e.g., salted meals, sports drink) to support hydration. Example day menu: Oatmeal with banana (breakfast), sandwich pretzels (lunch), pasta with lean meat sauce (dinner), plus fruit juice and sports drink as snacks – yielding ~500 g carb for a 60 kg athlete.

T-24 hours (Evening Before)

Aim for a carbohydrate-rich dinner[9]: e.g., white pasta with marinara and a bit of chicken, a bread roll. No heavy fats (skip extra cheese, creamy sauces). Drink fluids to ensure pale urine by bedtime. If prone to night hunger or early morning race, consider a late-evening carb snack (low-fat yogurt honey, or a bowl of cereal).

Race Morning (3-4h prior)

Eat a familiar pre-race meal ~3 h before[16]. Target ~1-2 g/kg of carbs (~60–120 g for 60 kg) and ~15-20 g protein, low in fiber/fat. Example: 2 cups of cereal with skim milk and a banana, or bagel with jam and a little peanut butter[103]. Include ~5-7 mL/kg fluid with this meal (~300-400 mL)[18] – e.g., water or sports drink. If you have a caffeine routine, consume caffeine (~3 mg/kg) 60–90 min pre-start[21][22] (this may coincide with this meal or a bit after, depending on race time).

T-2h (if race start > 3h post-meal)

Top off fluids: ~3 mL/kg (~180 mL for 60 kg) if urine still dark[18]. Continue sipping an electrolyte drink. This is a good time for a nitrate supplement if using (e.g., 1 beetroot shot ~2-2.5h prior)[95]. Avoid fiber now to prevent pit stops.

T-60 min (Final hour)

Take a small carb snack ~0.5-1 g/kg[104] to stabilize blood glucose. Example: 1 energy gel (if tolerable on semi-empty stomach) or a low-fiber granola bar (~20-25 g carb). Alternatively, sip 8 oz of sports drink (provides ~15 g carb) over the last 45 minutes. If prone to “jitters” or reactive hypoglycemia, some athletes prefer a few sips of carb drink or just a mouth rinse rather than a full snack – adjust based on practice. Ensure final hydration: ~200-250 mL in this last hour, but stop drinking heavy volumes ~15 min out to avoid a sloshy stomach.

T-15 min (Warm-up end)

Gel or carb boost now if needed – many athletes take a fast-acting gel 10-15 min pre-gun for an extra 20-25 g glucose availability by mid-race[105]. This is optional if the meal and snack covered you, but for 90 min races it can help. Wash it down with a few swallows of water. If not taking a gel, you can do a carbohydrate mouth rinse (swill a sports drink for 5-10s and spit) to stimulate the brain[24]. Finish any caffeine (e.g., last sips of coffee or caffeinated chew) by now so it kicks in during race.

Race Start (0 min)

You should be well-fueled, hydrated, but not over-full. Adrenaline is high – trust your training and fueling plan. During race, aim for ~30–60 g carb per hour[26] (if >60 min event) and ~400-600 mL fluid per hour[30], with ~300-600 mg sodium/L. During-race plan example: At 30 min, take 1 gel (with water at a drink station); at 60 min, sip ~150-200 mL of sports drink; at 75-80 min, optionally take a second gel if still going (for 90 min races). Adjust timing to the course layout (e.g., take fuel right before a running segment where it's easier to consume). If using sodium bicarbonate, you'd have taken it ~90 min pre-race[92]; by race start you might burp a bit but hopefully GI is settled – do not take any during, just rely on its preloaded effect.

During Race (every 15-20 min)

Hydration: Use opportunities (between stations, before/after intense obstacles) to grab fluid. Aim ~100-150 mL each time (couple of good gulps) so that over an hour you drink ~500 mL. If very sweaty conditions, drink more and ensure the drink has electrolytes. Many HYROX races have self-serve water tables – consider pre-mixing a bottle with sports drink to pick up (if allowed) to get both fluid and carb conveniently. Listen to thirst; don't over-drink, but don't ignore thirst either.

Post-Race (within 30 min)

Recovery nutrition begins immediately: Consume ~1.0–1.2 g/kg of carbs plus ~0.3 g/kg protein[31]. For a 60 kg female, that's ~60-70 g carb and ~15-20 g protein. Quick options: Chocolate milk 500 mL (about 55 g carb, 18 g pro) plus a banana (30 g carb)[92]; or a recovery shake; or a couple slices of white bread with deli turkey and an electrolyte drink. Also start rehydrating: aim to drink ~500 mL fluid in first 30 min (especially if you couldn't drink much during event). Include sodium either via a sports drink or salty snack to expedite rehydration[20]. If you feel too queasy to eat solid food, choose liquids or high-GI easy carbs (sports drink, gummy candies, etc.) to hit that carb target and get protein in soon (protein shake or bar).

1-2 hours Post-Race

Full meal: Eat a balanced meal with ample carbs, protein, and some fat once appetite returns. This helps complete muscle glycogen restoration and initiates muscle repair fully[59][58]. Aim for another ~1-2 g/kg carbs in this meal (e.g., rice, potatoes, bread) and ~20-30 g protein. Don't neglect veggies for micronutrients (your gut can handle fiber again now). Continue to rehydrate – total fluid intake should be about 1.5 times the weight you lost[20] (so if down 1 kg, drink ~1.5 L over next few hours). Use thirst and urine color as guides. If it's a multi-event competition, also consider creatine (if not already taking) and anti-inflammatory foods (tart cherry juice, omega-3 rich foods) in this phase to aid recovery for the next event.

Evening Post-Race

Monitor recovery: Many female athletes have suppressed appetite after intense races, but it usually normalizes by evening. Ensure you eat enough dinner – include quality protein (to further muscle recovery overnight) and healthy carbs to top off any remaining glycogen deficit. For example, a stir-fry with chicken, plenty of rice, and vegetables. If you had taken supplements like caffeine, be mindful that it might disrupt sleep – try to wind down, perhaps with a decaf herbal tea. Good sleep is the best recovery tool! By following these nutrition steps, you'll have maximized your performance and set yourself up for optimal recovery.

This detailed timeline shows how the various pieces (carb loading, meal timing, hydration, supplements, during-race fueling, recovery) come together for a female athlete. It's academically grounded in sports nutrition principles, yet practically oriented with real examples. Following such a plan, individualized through practice, helps female athletes toe the start line with full glycogen stores, well-hydrated cells, and a GI tract that's ready for the challenge – and finish the race with strong performance and a faster path to recovery for the next challenge.

[1][106]

[1] HYROX beginner guide: Format, stations, times, and first-race tips (2026)

https://www.rezerv.co/blogs/hyrox-beginner-guide-format-stations-times-and-first-race-tips-2026

[2] [6] [7] [8] [14] [15] [46] [48] [49] [51] [52] [53] [56] FUELING THE FEMALE ATHLETE: BRIDGING THE GAP FROM RECOMMENDATIONS TO CHANGING BEHAVIOR - Gatorade Sports Science Institute

https://www.gssiweb.org/sports-science-exchange/article/fueling-the-female-athlete-bridging-the-gap-from-recommendations-to-changing-behavior

[3] [9] [12] [13] [31] [45] [50] [106] Practical Approaches to Nutrition for Female Athletes - Gatorade Sports Science Institute

https://www.gssiweb.org/sports-science-exchange/article/practical-approaches-to-nutrition-for-female-athletes

[4] [62] [63] performancepartner.gatorade.com

https://performancepartner.gatorade.com/content/resources/pdfs/science-of-carbohydrate-2024.pdf

[5] [26] [32] [33] [57] [58] [59] International society of sports nutrition position stand: nutrient timing - PMC 

https://pmc.ncbi.nlm.nih.gov/articles/PMC5596471/

[10] Carbohydrate Loading and Female Endurance Athletes: Effect of ...

https://journals.humankinetics.com/downloadpdf/journals/ijsnem/17/2/article-p189.pdf

[11] Carbohydrate Loading Effects In Males and Females

http://trailandultrarunning.com/carbohydrate-loading-effects-in-males-and-females/

[16] Carbohydrates and Endurance Exercise: A Narrative Review of a Food First Approach - PMC 

https://pmc.ncbi.nlm.nih.gov/articles/PMC10054587/

[17] [23] [100] [103] [104] [105] What to Eat Before Hyrox

https://home-cooks.co.uk/pages/learn-eat-before-hyrox?srsltid=AfmBOop1-ZqXYY1DEIivS0tHfQWceFCmRWFiOXdaeA0AqAFVdYdVL_af

[18] [19] [20] [22] [60] [61] [64] [65] [68] [70] [76] Nutritional needs in the professional practice of swimming: a review - PMC 

https://pmc.ncbi.nlm.nih.gov/articles/PMC5772075/

[21] [66] [67] [69] [72] [73] [74] [75] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [92] [93] Dietary Supplements for Exercise and Athletic Performance - Health Professional Fact Sheet 

https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-HealthProfessional/

[24] [25] [27] [28] [29] Recommendations for carb intake during exercise

https://www.mysportscience.com/post/2015/05/27/recommendations-for-carb-intake-during-exercise

[30] Hydration Status Calculator 2025 - 1000 Calculators

https://1000calculators.com/calculators/health/medical/hydration-status.html

[34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] gssiweb.org

https://www.gssiweb.org/docs/default-source/sse-docs/jeukendrup_sse_178.pdf?sfvrsn=2

[47] Women's Sports Nutrition & The Female Hormone Cycle - WHOOP

https://www.whoop.com/us/en/thelocker/sports-nutrition-menstrual-cycle?srsltid=AfmBOorDSL4LRfp1iu8kMMWSZQ4vAjR8xeYsfbyUn-zcTS1AYMjdIZj1

[54] [55] [89] [90] [91] International Society of Sports Nutrition position stand: protein and exercise - PMC 

https://pmc.ncbi.nlm.nih.gov/articles/PMC2117006/

[71] nutritional concerns of the female athlete - PubMed

https://pubmed.ncbi.nlm.nih.gov/37221858/

[94] [95] [96] Sex differences in the effects of inorganic nitrate supplementation on ...

https://pubmed.ncbi.nlm.nih.gov/37823208/

[97] Sex differences in the nitrate-nitrite-NO• pathway - ScienceDirect.com

https://www.sciencedirect.com/science/article/abs/pii/S0891584918312486

[98] Dietary Supplements for Athletic Performance in Women: Beta ...

https://journals.humankinetics.com/view/journals/ijsnem/32/4/article-p311.xml

[99] Sports Nutrition Exam 4 Flashcards | Quizlet

https://quizlet.com/751159962/sports-nutrition-exam-4-flash-cards/

[101] [102] Drinks, Gels, Bars or "Real Food?" What Should I Use? – NEVERSECOND 

https://never2.com/blogs/guides/drinks-gels-bars-or-real-food-what-should-i-use-on-race-day