Ekelund, U., Poortvliet, E., Yngve, A., Nilsson, A., Hurtig-Wennlof, A., & Sjostrom, M. (2001). Heart rate as an indicator of physical activity intensity in adolescents. Medicine and Science in Sports and Exercise, 33(5), Supplement abstract 1406.

This study identified absolute and relative oxygen uptakes corresponding to heart rates of 120, 140, and 160 bpm in adolescent boys (N = 60) and girls (N = 67). A possible effect of fitness and fatness on the relation between heart rate and oxygen uptake was also investigated.

Fitness significantly affected the prediction of oxygen uptake at all heart rates. Heart rate was not related to activity levels. The use of absolute heart rates for defining activity levels is invalid.

Implication. Do not use absolute heart rates when prescribing activity levels for adolescents.

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