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

Exercise 7

Draw a summary graph of the changes in the following hormones with exercise of increasing intensity or duration: epinephrine, norepinephrine, cortisol, growth hormone, insulin, and glucagon.

Step 1 of 7

Though the body utilizes glucose as the immediate energy source, the metabolism alters during strenuous exercise. The type of substrate and rate of the utilization of the substrate depends on the intensity and duration of the exercise. While strenuous exercise requires immediate energy supplied from carbohydrate oxidation, prolonged and moderate exercise requires oxidation of fat reserves. The substrate mobilization is under hormonal control. Therefore, depending on the duration and intensity of exercise, the plasma concentration of various hormones varies.