Heart rate zones
Five zones by max heart rate and by Karvonen reserve
Formula and method
Karvonen method: target HR = resting HR + percentage × (max HR − resting HR). Using the reserve accounts for fitness, so people with a low resting pulse get higher zones than a plain percentage of max would give.
Sources
- Karvonen M.J. et al. The effects of training on heart rate. Ann Med Exp Biol Fenn, 1957.
- Tanaka H. et al. Age-predicted maximal heart rate revisited. J Am Coll Cardiol, 2001.