How do you calculate the Karvonen target heart rate for a 40-year-old man with a resting heart rate of 70?

To calculate the Karvonen target heart rate, you use the formula that incorporates both the maximum heart rate and the resting heart rate. The formula can be summarized in the following steps:

1. Determine the Maximum Heart Rate (MHR): This can typically be estimated by subtracting the individual's age from 220. For a 40-year-old man, the maximum heart rate would be 220 - 40 = 180 bpm.

2. Determine the Resting Heart Rate (RHR): In this case, the resting heart rate is given as 70 bpm.

3. Calculate the Heart Rate Reserve (HRR): The heart rate reserve is found by subtracting the resting heart rate from the maximum heart rate. So, for this individual: HRR = MHR - RHR = 180 bpm - 70 bpm = 110 bpm.

4. Determine the Target Heart Rate (THR): To find the target heart rate, you select a desired intensity level (usually expressed as a percentage, such as 60% to 85% of HRR), then add the resting heart rate back to this calculated reserve. If we assume a common intensity level of 75% for moderate exercise,