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Clinical cardiopulmonary exercise testing measuring your maximal oxygen uptake — the strongest predictor of all-cause mortality.

What is a good VO2 max score for my age?
VO2 max naturally declines with age at roughly 10% per decade after age 30. For men aged 40-49, a score above 40 mL/kg/min is considered "good" and above 48 is "excellent." For women of the same age, above 33 is "good" and above 40 is "excellent." However, longevity research suggests you should aim to be in the top 25% for your age and sex — the mortality benefit is dramatic.
How is a clinical VO2 max test different from what my Apple Watch shows?
Smartwatch VO2 max estimates are calculated from heart rate algorithms and are typically accurate only within 10-15%. A clinical test directly measures oxygen consumption and carbon dioxide production from every breath, providing true VO2 max along with anaerobic thresholds, fat oxidation rates, and ventilatory data that wearables cannot capture.
Can I improve my VO2 max at any age?
Yes. Research consistently shows that VO2 max is trainable at any age. High-intensity interval training (HIIT) and zone 2 endurance training are the most evidence-based approaches. Improvements of 15-20% are common within 8-12 weeks of structured training, even in previously sedentary individuals over 60.
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