VO2 Max — The One Number That Predicts How Long You Live
Stanford and Mayo Clinic research confirms VO2 max is a stronger mortality predictor than smoking status. Here is why.
Track This Biomarker Free → ← All BiomarkersWhat Is VO2 Max — The One Number That Predicts How Long You Live?
VO2 max measures how efficiently your cardiovascular system delivers oxygen to working muscles at peak effort. It declines approximately 10% per decade after age 30 without intervention. A 2018 JAMA Network Open study of 122,000 patients found that low cardiorespiratory fitness carried higher mortality risk than hypertension, diabetes, smoking, or elevated cholesterol combined.
What Causes VO2 Max to Change
The most common drivers behind a change in VO2 Max are:
- Sedentary behavior — VO2 max declines rapidly without aerobic stimulus
- Aging — approximately 1% per year after 30 without training
- Overweight — VO2 max is body-weight normalized; fat mass reduces the score
- Smoking — reduces oxygen-carrying capacity
- Sleep deprivation — impairs cardiac output and recovery
- Overtraining without adequate recovery — suppresses adaptation
How Hunuu Tracks VO2 Max
Hunuu calculates VO2 max estimates from Apple Watch, Garmin, and Polar device data using validated submaximal models. Longitudinal VO2 max trend analysis flags cardiovascular risk trajectories 6–12 months before clinical presentation.
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