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Overtraining and low testosterone levels...

Five endurance-trained men were studied before, immediately after, and 3 months after overtraining, which was defined as twice the previous average weekly training volume with unchanged intensity.

Basal testosterone levels decreased to 5.37 +/- 67 ng/mL from 8.68 +/- 93 ng/mL immediately after overtraining and basal cortisol levels increased to 215.3 +/- 31 ng/mL from 145.7 +/- 27 ng/mL.

Both cortisol and testosterone levels returned to pretraining values 3 months after resumption of previous training volume.

Sperm count decreased significantly by 43% immediately after overtraining and by 52% 3 months after overtraining.

These results indicate that overtraining reduces testosterone levels, which is highly correlated with an increase in levels of cortisol.

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References
Roberts AC, McClure RD, Weiner RI, Brooks GA. (1993). Overtraining affects male reproductive status. Fertility and Sterility, 60, 686-692

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