Longevity Medicine
What Is VO2 Max?
Last reviewed: May 2026 · Haute MD Editorial Team
VO2 max is the maximum rate of oxygen consumption during maximal exercise — a measure of cardiorespiratory fitness and aerobic capacity. It is the single strongest predictor of all-cause mortality according to multiple large studies, outperforming all other biomarkers including blood pressure, cholesterol, blood glucose, and smoking status.
Why VO2 max predicts longevity
A landmark 2018 JAMA study of 122,000 patients found that low cardiorespiratory fitness was associated with higher mortality risk than smoking, diabetes, or hypertension. Moving from the lowest to below-average fitness category reduced mortality risk by 50%. Moving to above-average reduced risk by 70%.
How VO2 max is measured
Gold standard: VO2 max testing on a treadmill or bike with a metabolic cart measuring exhaled gas analysis. Estimation: many consumer wearables (Garmin, Apple Watch, WHOOP) estimate VO2 max from heart rate data during exercise. Less accurate than direct measurement but useful for tracking trends.
How to improve VO2 max
Zone 2 training (sustained exercise at 60-70% maximum heart rate for 30-60 minutes, 3-4 times per week) is the most effective approach. High-intensity interval training (HIIT) and Norwegian 4x4 intervals are also highly effective.
Frequently Asked Questions
What is a good VO2 max by age?
For men at 40: excellent >52 ml/kg/min; good 44-51; average 37-43. For women at 40: excellent >46; good 38-45; average 31-37. Target the 75th-90th percentile for your age.
Can VO2 max be improved at any age?
Yes. VO2 max is highly trainable at all ages. A 2019 study showed older sedentary adults improved VO2 max by 18% in 8 weeks of structured training.
How does VO2 max decline with age?
VO2 max declines approximately 10% per decade after age 25-30 without training. Regular aerobic exercise significantly slows this decline.
Does VO2 max affect cognitive function?
Yes. Higher VO2 max is strongly associated with better cognitive function, larger hippocampal volume, and reduced dementia risk.
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