VO2 max, or maximal oxygen uptake, represents the highest volume of oxygen your body can consume per minute during all-out exercise. It is expressed in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min). The higher your VO2 max, the more efficiently your cardiovascular and respiratory systems deliver oxygen to working muscles.
This metric matters because it directly correlates with endurance performance and overall cardiovascular health. Research has consistently linked higher VO2 max values with reduced risk of heart disease, lower all-cause mortality, and better metabolic health. It is one of the strongest predictors of longevity, making it relevant for everyone — not just competitive athletes.
VO2 max is influenced by genetics, age, sex, and training status. While genetics set a ceiling, consistent aerobic training — especially a mix of steady-state Zone 2 work and high-intensity intervals — can significantly improve your VO2 max. Most people can increase theirs by 15–20% with structured training over several months.
You can estimate VO2 max through lab-based protocols like a graded treadmill test or through field tests such as a timed mile run. Many wearables, including those integrated with Vora, now provide estimated VO2 max using heart rate data and workout intensity. While estimates are not as precise as lab tests, they are useful for tracking trends and ensuring your training is moving your fitness in the right direction.