What is Heart Rate Reserve?

Better Workouts uses Heart Rate Reserve to calculate TRIMP or TRaining IMPulse.

Heart Rate Reserve is a how much your Heart Rate can speed up with exercise. It's the difference between the fastest heart rate (Maximum Heart Rate) and the slowest (Resting Heart Rate.)

Heart Rate Reserve (HRR) is normally calculated as the difference between your Maximum Heart Rate (HRmax) and Resting Heart Rate (HRrest). Exercise intensity can be evaluated by calculating your heart rate as a percentage of HRR. The calculation to work out %HRR is:

%HRR = (HRex – HRrest)/(HRmax – HRrest)

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