Hormones play important roles in providing energy to the muscles and nerves. They are also involved in replacing that energy. In addition, they play roles in repairing and building tissues. The following are some of the most important functions that hormones perform for athletes.
Endurance work increases the use of glucose by muscles. The following hormones facilitate the use and replacement of muscle glucose. An increase in secretion of the hormone glucagon facilitates the movement of glucose from the liver to the blood, which carries it to the working muscles. The hormones epinephrine (adrenaline) and norepinephrine are also secreted in additional amounts. They aid in the movement of liver glucose to the blood. The secretion of cortisol facilitates the conversion of liver glycogen to glucose. The increased secretion of the hormone insulin, is directly involved in transferring blood glucose into the working muscle fibers.
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