Question

which describes how to determine a persons target heart rate (thr) zone for exercise?
the thr zone is based on the rates of perceived exertion (rpe).
the thr zone is determined by subtracting the individuals age from 220.
the thr zone is the zone number on the training zone table.
the thr zone is calculated as a range between 50 - 85% of the maximum heart rate (mhr).

Explanation:

The target - heart - rate (THR) zone for exercise is commonly calculated as a range between 50 - 85% of the maximum heart rate (MHR). Subtracting age from 220 gives an estimate of MHR, but the THR is a percentage - based range of this MHR. The Ratings of Perceived Exertion (RPE) is a different measure of exercise intensity. And the zone number on a training zone table is based on the percentage - based calculation of MHR for THR.

Answer:

The THR zone is calculated as a range between 50 - 85% of the maximum heart rate (MHR).