Discussion
Calculate THR at 85% intensity for a 24 year old Kho-Kho player whose RHR is 64 bpm and who wants to perform 20 min. aerobic activity :
Answer: A
The target heart rate is 176.2 bpm.
Use the Karvonen (heart rate reserve) method.
\[ \begin{aligned} HR_{max} &= 220 - 24 = 196 \\ HRR &= 196 - 64 = 132 \\ THR &= 0.85 \times 132 + 64 \\ &= 112.2 + 64 = 176.2 \end{aligned} \]
So the player should work at about 176 beats per minute.
The other values do not follow from these data. Taking 85 percent of the maximum heart rate alone, which ignores the resting heart rate, would give 166.6, and 175.2 and 177.2 are one beat away from the correct result.
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