Increases in VO_2max to a physical fitness standard are best realized for fit individuals at an intensity of:

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Increases in VO2 max, a measure of aerobic fitness, are most effectively achieved at higher exercise intensities, particularly around 85% of Heart Rate Reserve (HRR) for fit individuals. This intensity level pushes the cardiovascular system to adapt and improve more than lower intensity levels.

Increases in VO2max to a Physical Fitness Standard Are Best

Increases in VO_2max to a Physical Fitness Standard Are Best