Heart rate is a key variable in the prediction of maximal oxygen uptake in many tests of cardiorespiratory fitness.

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Heart rate is commonly used as a predictor of maximal oxygen uptake (VO2 max) which is a measure of cardiorespiratory fitness. In fact, many fitness tests such as the Bruce Treadmill Test and the 20-meter shuttle run test use heart rate as a variable to predict VO2 max.

Heart Rate Is a Key Variable in the Prediction of Maximal