Using the Karvonen method, what would be the target heart rate for a 22-year-old male with a resting heart rate of 66 beats per minute, prescribed an exercise intensity of 70%?

To determine the target heart rate using the Karvonen method, you first need to calculate the Heart Rate Reserve (HRR). The HRR is found by subtracting the resting heart rate from the maximum heart rate. The maximum heart rate is commonly estimated using the formula: 220 minus the person's age.

For the 22-year-old male in this scenario:

• Maximum heart rate = 220 - 22 = 198 beats per minute.

• Heart Rate Reserve (HRR) = Maximum heart rate - Resting heart rate = 198 - 66 = 132 beats per minute.

Next, to find the target heart rate at 70% intensity, you take 70% of the HRR and then add the resting heart rate back in to find the final target heart rate.

• 70% of HRR = 0.70 x 132 = 92.4 beats per minute.

• Target heart rate = 70% HRR + Resting heart rate = 92.4 + 66 = 158.4 beats per minute.

This calculation shows that the target heart rate, rounded to the nearest whole number, would actually be approximately 158 beats per minute, not 132 beats per minute.