VO₂ Max: The Single Number That Predicts How You Will Age
No biomarker — not LDL, not HbA1c, not blood pressure — predicts all-cause mortality as well as VO₂ max.
Why VO₂ max wins
A 2018 JAMA Network Open paper followed 122,000 adults across two decades. The bottom 25% by VO₂ max had a 5× higher mortality rate than the top 2.5%. Even moving from "low" to "below-average" cut the risk in half. No drug has that effect size at population scale.
What good looks like
"Above-average" for sex and age is the floor to aim for. By 40, that's roughly 35 ml/kg/min for women and 40 for men; "elite" begins around 50–55 for women and 55–60 for men. Numbers decline ~10% per decade by default — and the steepness of the decline is mostly under your control.
How to grow it
80% of your weekly cardio in Zone 2 (conversational pace) builds the aerobic base. 20% in Zone 4/5 intervals (4×4 minute hard efforts) pushes the ceiling. Three to four sessions per week, with progressive overload over months, is enough to move VO₂ max by 10–20% in a year for most untrained adults.
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