What is heart rate reserve used for?

HRR is used to calculate target heart rate training zones for exercise prescription using the Karvonen formula: Target HR = HRR × %intensity + HRrest.

What is a normal resting heart rate?

Normal resting HR is 60-100 bpm; athletes may have resting HR 40-60 bpm due to increased stroke volume.

How accurate is the 220-age formula?

The 220-age formula has ±10-12 bpm standard deviation. The Tanaka formula (208 - 0.7×age) is more accurate for middle-aged adults.

Heart Rate Reserve Calculator

Calculate heart rate reserve (HRR = HRmax - HRrest) using the Karvonen method to set training target zones.

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