Example 2.1.6 Target heart rate

According to the American Heart Association, a person's maximum heart rate, in beats per minute (bpm), is given by \(220 - a\text{,}\) where \(a\) is their age in years.

  1. Determine the maximum heart rate for someone who is \(31\) years old.

  2. A person's target heart rate for moderate exercise is \(50\%\) to \(70\%\) of their maximum heart rate. If they want to reach \(65\%\) of their maximum heart rate during moderate exercise, we'd use the expression \(0.65(220-a)\text{,}\) where \(a\) is their age in years. Determine the target heart rate at this \(65\%\) level for someone who is \(31\) years old.

Explanation
in-context