50 of THRZ using the Karvonen Formula is 118 X 50 72 131 bpm. The maximal heart rate is commonly assumed to be 220age in years. Heres a simple but less accurate formula.
The difference between the maximum and resting heart rate is called the residual or reserve heart rate.
Solving Equations Video Lesson Khan Academy Video. Example A Patient performs Exercise Tolerance Test ETT with values as follows. 220 - 50 170 for HRmax 170 - 65 105 for RHR. Post author By Run and Beyond.