Table 1—

Classification of physical activity intensity, based on physical activity lasting up to 60 min

Relative intensity
IntensityVo2max (%)Maximal heart rate (%)*RPE
Very light<20<35<10
Very hard>85>9017–19
  • Modified by Haskell and Pollock from Physical Activity and Health: A Report of the Surgeon General (4).

  • *

    * Maximal heart rate (HRmax) = 220 − age (Note: It is preferable and recommended that HRmax be measured during a maximal graded exercise test when possible);

  • Borg rating of relative perceived exertion (RPE) 6–20 scale;

  • maximal values are mean values achieved during maximal exercise by healthy adults.