VO2max is the strongest mortality predictor we have. Here is why.
A landmark 2018 Cleveland Clinic study found the mortality gap between low-fit and elite-fit is larger than between smokers and non-smokers. VO2max is the metric behind it.
In 2018, Mandsager and colleagues published a study of 122,007 patients in JAMA Network Open. The finding was stark: cardiorespiratory fitness, measured as VO2max, was inversely associated with all-cause mortality with no observed upper limit of benefit.
What is VO2max?
VO2max is the maximum volume of oxygen your body can use per minute, per kilogram of body weight, during intense exercise. It is the single best lab measure of aerobic fitness.
How big is the effect?
The mortality hazard difference between the low-fit and elite-fit groups exceeded the difference between smokers and non-smokers. Being unfit, in other words, carried a risk comparable to — or greater than — established disease states.
How to measure it without a lab
The Cooper 12-minute test estimates VO2max from the distance you cover in 12 minutes of maximum effort. Our free VO2max calculator turns that distance into your VO2max and a fitness rating against age and sex norms in seconds.
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- PhenoAge Calculator — Biological age from a standard blood panel (Levine 2018).
- VO2max Calculator — Cooper 12-minute test → VO2max + fitness age + mortality hazard.
- TDEE & Macro Calculator — Mifflin-St Jeor maintenance calories + protein/fat targets.