VO₂ max is the single best measure of aerobic fitness. It represents the maximum volume of oxygen your body can use per minute during intense exercise.
Average Values
- Untrained males: 35–40 mL/kg/min
- Untrained females: 27–31 mL/kg/min
- Elite endurance athletes: 70–85 mL/kg/min
How to Improve
High-intensity interval training (HIIT) and sustained aerobic exercise (running, cycling, swimming) improve VO₂ max by 15–20% over 8–12 weeks.
How VO₂ Max Is Actually Measured
Lab testing uses a metabolic cart during a graded treadmill or bike test to directly measure oxygen consumption at maximal effort. Consumer wearables (smartwatches) estimate VO₂ max using heart rate and pace data rather than measuring gas exchange directly — useful for tracking trends, but typically less accurate than a lab test.
VO₂ Max and Longevity
Large cohort studies have linked higher VO₂ max to significantly lower all-cause mortality risk, independent of other fitness markers — some research places cardiorespiratory fitness among the strongest predictors of longevity, ahead of traditional risk factors like blood pressure or cholesterol.