In more detail
It can be estimated from a timed run or from heart rate (maximum heart rate is roughly 220 − age). Training zones are set as percentages of heart-rate reserve: (max − rest) × intensity + rest.
VO₂ max is the maximum rate at which the body can use oxygen during hard exercise, a standard measure of aerobic fitness in mL per kg per minute.
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It can be estimated from a timed run or from heart rate (maximum heart rate is roughly 220 − age). Training zones are set as percentages of heart-rate reserve: (max − rest) × intensity + rest.