Changes in Androstenedione, Testosterone and Protein Metabolism as a Result of Exercise

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Abstract
The effects of endurance training on urea excretion and plasma androgen concentrations were investigated in male, female and castrated male rats. Training increased urea excretion in male rats but not in female rats. Castration of male rats increased urea excretion to levels like those observed in trained rats and training did not further increase urea excretion. The level of testosterone in trained rats was lower than that of untrained rats. In trained rats there was a slight (P > 0.05) increase in testosterone immediately after exercise but the concentration of testosterone was significantly (P < 0.05) lowered 6 h after exercise. Plasma testosterone was also significantly lowered after an exhaustive exercise run. These results suggest that an alteration in plasma androgen levels may be responsible for the increased urea excretion that we observed in trained rats.