VO₂ Max in Elite Endurance and Hybrid Athletes: Research & Applications
Introduction
Maximal oxygen uptake (VO₂ max) represents the highest rate at which an individual can consume oxygen during intense exercise. It is a cornerstone metric in exercise physiology, historically viewed as a “ceiling” for aerobic energy delivery and endurance capacity[1][2]. A.V. Hill’s early 1920s work introduced the VO₂ max concept, framing it as a fundamental limit of the cardiorespiratory system’s ability to deliver O₂ to working muscles[3][4]. For decades, VO₂ max has been used to characterize athletes’ cardiovascular fitness and to gauge training effects[5]. However, while a high VO₂ max is generally necessary for elite endurance performance, it is not sufficient on its own – factors like exercise efficiency, lactate threshold (fractional utilization of VO₂ max), and movement economy also critically determine race outcomes[1][2]. This review presents an up-to-date analysis of VO₂ max research, with emphasis on recent findings (2023–2025) and their practical implications for HYROX athletes – competitors in a hybrid endurance-strength event that combines running and functional exercises. We compare the latest VO₂ max data from elite endurance athletes (highlighting a new study on Tour de France champion Tadej Pogačar) to both contemporary and foundational studies, and examine how these insights translate to elite vs. intermediate HYROX athletes. We also contrast HYROX athletes’ profiles with those of runners and CrossFit athletes, where appropriate, to delineate how sport-specific demands influence the role of VO₂ max. Finally, we discuss the practical applications of VO₂ max data in training, performance prediction, and recovery strategies for HYROX, and review the reliability of VO₂ max measurement techniques – from gold-standard laboratory tests to emerging portable devices – including their limitations and field usefulness.
VO₂ Max Research Highlights (2023–2025)
Record-Setting Aerobic Capacities in Cycling: A headline discovery in recent VO₂ max research comes from a 2025 analysis of Tour de France winner Tadej Pogačar. In this study, Berg et al. reverse-engineered Pogačar’s physiological demands during several major mountain climbs in the 2024–2025 Tours[6][7]. By inputting Pogačar’s publicly available climbing times, estimated power outputs, and known relationships between sustained power (critical power) and VO₂ max, the authors calculated that Pogačar sustained ≈80 mL·kg⁻¹·min⁻¹ O₂ uptake for ~40 minutes on key ascents[8][7]. Extrapolating from this, his maximal oxygen uptake during the race was likely in the high 90s mL·kg⁻¹·min⁻¹ – potentially as high as ~96 mL·kg⁻¹·min⁻¹[7][9]. For context, this would place Pogačar among the most aerobically gifted athletes ever documented. The highest directly recorded VO₂ max in the literature is about 97.5 mL·kg⁻¹·min⁻¹ (achieved by a young Norwegian cyclist, O. Svendsen)[10]. Even renowned champions like Greg LeMond had VO₂ max values in the mid-90s, and Chris Froome’s was estimated around 88 mL·kg⁻¹·min⁻¹ at peak[11]. Pogačar’s data underscore how modern training, technology, and perhaps genetics are pushing VO₂ max boundaries in cycling to unprecedented levels[12][13]. These findings also reinforce the long-held notion that Grand Tour success demands an extraordinary VO₂ max – on the order of ~85–90 mL·kg⁻¹·min⁻¹ for the very best[8][7].
Trends in Recent VO₂ Max Studies: Beyond this high-profile case study, recent research (2023–2024) has explored VO₂ max in various contexts: from training interventions to sport-specific observations. Meta-analyses in 2023 have examined how different training intensity distributions affect VO₂ max development in endurance athletes, finding that both polarized (high-volume low-intensity some high-intensity) and pyramidal training can yield comparable VO₂ max improvements in well-trained cyclists[14]. High-intensity interval training (HIIT) and even sprint-interval protocols continue to be confirmed as potent stimuli for raising VO₂ max in athletes[15], with one 2023 study suggesting repetitive sprint training may have slightly higher efficacy for VO₂ max gains in already-trained individuals[15]. There is also growing interest in functional fitness and hybrid sports, prompting studies on CrossFit and HYROX populations (discussed below) which consistently highlight VO₂ max as a key performance discriminator in these multi-modal events[16][17]. Furthermore, “big data” and wearable tech have entered VO₂ max research: for example, a 2024 validation study assessed the Apple Watch’s VO₂ max estimation against lab measurements[18], reflecting the demand for accessible field monitoring of aerobic fitness. In summary, the latest research confirms VO₂ max’s importance across disciplines while also emphasizing that context matters – the implications of a given VO₂ max differ for a cyclist, a marathoner, or a hybrid athlete, as each sport requires different degrees of sustained utilization, strength, and technique.