Warrior Lab app
Keep workouts, nutrition and daily feedback together. Use the available performance, readiness and movement tools to review progress.
Explore Free + Pro →WPL WHOLE-ATHLETE CONTEXT
THE ENGINE IS ONE PART OF PERFORMANCE.
Your metabolic profile helps explain the engine. WPL considers movement quality, station endurance, fueling, recovery and race execution, plus running economy and body composition where suitable measurements are available.
An INSCYD analysis does not measure all eight WPL performance pillars. The whole-athlete conclusion is a WPL coaching interpretation built from the evidence available.
EDUCATION HUB
UNDERSTAND YOUR ENGINE
Clear definitions matter because the source of every conclusion changes how confidently it should guide training.
What is PPD-R?
PPD-R is the current official INSCYD running field protocol used for the remote pathway. It combines assigned maximal efforts with the original GPS activity file to generate a model-derived metabolic profile. It does not directly measure oxygen uptake.
VO₂max: the aerobic ceiling
VO₂max describes the upper limit of oxygen use. It matters, but it does not by itself reveal economy, glycolytic cost, durability, pacing or how a station changes the next run.
VLamax: glycolytic power
VLamax is a protocol-dependent estimate related to maximal lactate formation and glycolytic capacity. Its value depends on the event and the whole profile. Lower is not automatically better, and there is no established ideal HYROX value in the studies reviewed here.
LT1 and MLSS
LT1 and MLSS describe different intensity boundaries. Their estimates depend on the method; a modeled MLSS is not a direct steady-state verification. WPL checks prescribed zones against effort, training response and sport-specific demands.
FatMax and fuel use
The profile estimates fuel use across intensity. FatMax is not a fat-loss prescription, and estimated carbohydrate use is not the amount you must eat each hour. Fueling is refined through training, tolerance, duration and race conditions.
Lactate is not simply waste
Blood lactate is a useful marker when sampled at defined times and interpreted with workload and recovery. It is not a standalone diagnosis of fitness or fatigue.
Fresh speed vs. compromised speed
A fresh run and a run after sleds, burpees, carries or lunges can expose different constraints. WPL checks whether the cost is metabolic, local muscular, technical, pacing-related or mixed.
How data changes training
The useful outcome is a hierarchy: primary limiter, secondary constraint, strength to protect, next training priority and the marker that determines progression.
Why matched-condition retesting matters
Comparable route, device, surface, shoes, preparation and environmental context make it easier to judge whether the targeted quality improved without sacrificing a current strength.
EVIDENCE REVIEWED · OCTOBER 24, 2026
SCIENCE INFORMS THE PLAN. YOUR RESPONSE GUIDES IT.
Recent HYROX research supports looking at running and stations together. Validation of a metabolic model applies to the specific output, protocol and population studied.
39,696 race results. A strong case for running.
Rappelt and colleagues analyzed PRO and ELITE results across seven seasons. Running occupied about half of race time; station performance also mattered.
WPL application: Review running capacity alongside station strength endurance and execution.
Study context + source
Retrospective race-result analysis, not a training intervention or a validation of metabolic predictions. The dataset contains race results, not necessarily unique athletes.
Rappelt et al., 2026 · Read study ↗Aerobic capacity matters. One score is not the race.
In a simulated Open event with 11 recreational participants, higher VO₂max was associated with faster completion.
WPL application: Assess aerobic capacity within the full performance picture.
Study context + source
Small sample, including three women, and an observational association. It cannot establish causation, an individual finish time or the best training plan.
Brandt et al., 2025 · Read study ↗Threshold estimates need protocol context.
A study of 29 cyclists supported INSCYD estimates of MLSS power using laboratory VO₂max and sprint/lactate inputs.
WPL application: Label calculated thresholds and review them against training response.
Study context + source
Cycling validation does not validate every remote running output, fuel-use estimate or HYROX application. One author disclosed an INSCYD consultancy.
Poffé et al., 2024 · Read study ↗New VO₂max evidence, with clear limits.
A cycling study compared model-calculated VO₂max with gas-exchange measurements in 11 trained men.
WPL application: Keep calculated oxygen uptake clearly labeled as an estimate.
Study context + source
All authors were affiliated with INSCYD. The small male cycling sample does not establish accuracy for every runner or HYROX athlete; broader independent validation is needed.
Van Schuylenbergh et al., 2026 · Read study ↗Running protocol information: INSCYD’s PPD-R overview ↗ is a manufacturer description, distinct from the studies above. Test preparation and data requirements are confirmed for your assigned protocol.
COACH-INTERPRETED RESULTS
DATA ONLY MATTERS WHEN IT CHANGES THE DECISION.
Ayda Page brings more than 25 years of coaching experience to WPL’s Test–Analyze–Train–Retest process. Every accepted profile is reviewed for evidence quality, translated into athlete-friendly priorities and connected to a clear retest strategy.
Analyzed with INSCYD. Interpreted by Warrior Performance Lab.