Discussion
Calculate the THR at 75% intensity for a 22 year old handball player whose RHR is 60 bpm and who wants to perform 30 min cardio activity.
Answer: B
The target heart rate is 163.5 bpm.
The Karvonen formula uses the heart rate reserve, the difference between maximum and resting heart rate:
\[ THR = (HR_{\max} - RHR) \times I + RHR \]
\[ \begin{aligned} HR_{\max} &= 220 - 22 = 198 \\ HRR &= 198 - 60 = 138 \\ THR &= 138 \times 0.75 + 60 \\ &= 103.5 + 60 = 163.5 \end{aligned} \]
None of the other options follows from the formula: taking 75 percent of the maximum heart rate alone gives 148.5, near option A, and the 30-minute duration does not enter the calculation.
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