How is VO₂max measured?

VO₂max is usually measured during an incremental exercise test using a treadmill or cycle ergometer. Oxygen use is measured using a specialized instrument attached to a mouthpiece or mask that the participant wears. The participant then increases the exercise intensity over time. VO₂max is the rate of oxygen consumption at the point at which the oxygen uptake rate no longer increases (or only increases marginally) even with an increase in workload.

Why does VO₂max matter?

An improvement in cardiorespiratory fitness increases the chances of survival and decreases the likelihood of long-term problems. VO₂max is also related to cardiorespiratory endurance, which indicates how active someone can be without getting exhausted.

What are the benefits of a higher VO₂max?

The amount of oxygen used by cells in the body is critical for health and performance. The body needs oxygen for typical daily functions including moving muscles and organ function. People with higher a VO₂max generally have a decreased risk of dying early and developing a range of chronic illnesses.

How does VO₂max change as we age?

As we age, the function of our heart, muscles, and lungs declines, which ultimately results in a decreased VO₂max. On average, there is around a 5-10% drop every ten years.