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Power
VO2 max
The maximum volume of oxygen your body can consume and use during intense exercise.
VO2 max is the maximum rate, in milliliters of oxygen per kilogram of body weight per minute, that you can consume during intense exercise. It represents the upper limit of your aerobic system.
How it is measured
- Lab test: Treadmill or bike ramp test with a metabolic cart. The gold standard.
- Estimation: Power at 5-minute maximum effort, divided by body weight, gives a rough estimate (typically around 75–85% of true VO2 max in watts).
- Wearable estimates: Garmin, Apple, and others estimate VO2 max from HR and pace. Useful for trend, weak for absolute value.
Why it matters
VO2 max is a ceiling on your aerobic capacity. Two riders with the same FTP but different VO2 max will respond differently to training and tolerate hard surges differently. It is trainable, though gains slow significantly after the first 1–2 years.
Common misconceptions
- A high VO2 max does not guarantee a high FTP. The percentage of VO2 max you can sustain matters too.
- VO2 max is partly genetic but absolutely trainable — 10–20% gains in untrained athletes are common.
- "Z5" or "VO2 work" intervals on Strava are not the same as actually working at VO2 max.
Related concepts
FTP, Critical Power, Max HR.