Heart rate reserve (HRR) is the difference between a person's measured or predicted maximum heart rate and resting heart rate. Some methods of measurement of exercise intensity measure percentage of heart rate reserve. Additionally, as a person increases their cardiovascular fitness, their HRrest will drop, thus the heart rate reserve will increase. Percentage of HRR is equivalent to percentage of VO2 reserve.
- HRR = HRmax − HRrest
This is often used to gauge exercise intensity (first used in 1957 by Karvonen).
Karvonen's study findings have been questioned, due to the following:
- The study did not use VO2 data to develop the equation.
- Only six subjects were used, and the correlation between the percentages of HRR and VO2 max was not statistically significant.
Read more about this topic: Heart Rate
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