A therapist determines the target heart rate of a 45-year-old patient using the age-adjusted target heart rate formula. Which of the following heart rates would fall within the patient's normal training range?

To determine the target heart rate for a 45-year-old patient, the age-adjusted target heart rate formula typically involves calculating a percentage of the patient's maximum heart rate, which is commonly estimated as 220 minus the patient's age. In this case, the maximum heart rate would be calculated as 220 - 45, which equals 175 beats per minute.

For typical cardiovascular training, the target heart rate zones usually fall within 50% to 85% of the maximum heart rate. Therefore, to derive the training range for the patient:

1. Calculate 50% of the maximum heart rate: 0.50 x 175 = 87.5 beats per minute.

2. Calculate 85% of the maximum heart rate: 0.85 x 175 = 148.75 beats per minute.

Thus, the patient's normal training range would be approximately 88 to 149 beats per minute. The heart rate of 145 beats per minute falls within this training range, making it the correct answer. It indicates that the patient is training at an intensity that should effectively promote cardiovascular fitness without exceeding safe limits.

The other heart rates listed either fall below or above this calculated range, indicating levels of exertion that are not optimal for