VO2max (maximal oxygen consumption) is the maximum rate at which the body can absorb, transport, and utilize oxygen during intense exercise. It is widely considered the gold standard measure of cardiovascular fitness and aerobic endurance capacity.
What does VO2max tell you?
VO2max is expressed in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min). Elite male endurance athletes typically have values between 70-85 mL/kg/min, while elite female athletes range from 60-75 mL/kg/min. For recreational athletes, values between 40-60 mL/kg/min are common. A higher VO2max indicates a greater capacity to perform sustained aerobic work.
How is VO2max measured?
The gold standard measurement uses a ramp or incremental exercise protocol on a bike ergometer or treadmill while the subject breathes through a mask connected to a gas analyzer (spirometer). OpenSpiro connects to portable analyzers like Calibre Bio and VO2Master to measure breath-by-breath oxygen consumption and carbon dioxide production. The test continues until the subject reaches volitional exhaustion or a plateau in oxygen uptake is observed.
Best practices for VO2max testing
Most invalid VO2max results come from poor preparation, not bad hardware. OpenSpiro solves this with integrated pre-test checklists that walk you through every step: rest status verification, nutrition timing, hydration, equipment calibration, and warm-up protocol. The ramp test uses individual watt thresholds calculated from the athlete's profile - no more generic 'start at 100W' for everyone. Stage progression is automatic, and the app monitors for test validity criteria in real time so you know immediately if something went wrong.
References & further reading
- Maximal oxygen uptake: classical versus contemporary viewpoints — Levine BD, Med Sci Sports Exerc 2008
- VO2max: what do we know, and what do we still need to know? — Poole DC et al., J Physiol 2017
- Criteria for maximal oxygen uptake: review and commentary — Edvardsen E et al., Med Sci Sports Exerc 2014