Exercise Physiology: Theory and Application to Fitness and Performance 9th Edition by Scott Powers, Edward Howley

Exercise 8

Graph the changes that occur in heart rate, stroke volume, and cardiac output during prolonged exercise. What happens to these variables if the exercise is performed in a hot/humid environment?

Step 1 of 3

Heart rate is the number of heart beats per minute. It is the speed at which the heart beats. The normal adult heart beat at resting stage is 60 – 100 bpm. During exercise, the heart rate changes and the change depends on the type of work involved. During prolonged exercise, the cardiac output remains at a constant level throughout the duration of exercise. This is represented in the graph given below.

Figure 1: Changes in heart rate with prolonged exercise