Final answer:
The heart rate reserve can be calculated by subtracting the resting heart rate from the maximum heart rate. In this case, the maximum heart rate is given as 200 bpm and the resting heart rate is 65 bpm. To find the heart rate reserve, subtract 65 bpm from 200 bpm:
Heart rate reserve = Maximum heart rate - Resting heart rate
Heart rate reserve = 200 bpm - 65 bpm = 135 bpm
Step-by-step explanation:
The heart rate reserve is calculated by subtracting the resting heart rate from the maximum heart rate. In this case, with a 200 bpm maximum heart rate and a resting heart rate of 65 bpm, the heart rate reserve would be 200 bpm - 65 bpm, which equals 135 bpm. This number represents the range within which the heart rate can increase during physical exertion above the resting level before reaching the maximum heart rate.