VO₂ Max Testing
Confirms your cardiorespiratory fitness baseline — the strongest single predictor of all-cause mortality.
What it does
Confirms your cardiorespiratory-fitness baseline — among the most robust predictors of all-cause mortality in the literature, stronger than smoking, diabetes, or hypertension in several large cohorts.
Measures maximal oxygen uptake during graded exercise — directly, via cardiopulmonary exercise testing, or estimated from a submaximal protocol.
What the evidence shows
Overall evidence strength: High certainty
Who it's for, who should skip
Anyone wanting a true fitness baseline. Lab-measured is the gold standard; a wearable estimate can be off by a meaningful margin, so don't treat the two as clinically equivalent.
Running it
Measuring it
Retest VO₂ max — No guideline interval — retest after a significant training or fitness change..
Stacking & alternatives
Access & cost
Prescription or clinician order — typically via exercise physiology lab (CPET).
Last reviewed 27 August 2026.