Heart rate increases proportionately with oxygen uptake, so HR can be used to gauge the intensity of exercise in place of VO₂max testing.

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This is true. Heart rate is a good indicator of exercise intensity and can be used as an alternative to V02max testing. As the body requires more oxygen during exercise, the heart rate will increase to supply the muscles with the necessary oxygen. By monitoring heart rate during exercise, one can gauge the intensity level and adjust accordingly.

Heart Rate Increases Proportionately with Oxygen Uptake, So HR Can