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Heat Exposure
Title:Occupational heat exposure and male fertility
Author: P. Thonneau et al.
Address: Toulouse, France
Source: Human Reproduction 13:2122-2125(August) 1998
Summary: The role of occupational heat exposure and male fertility is reviewed by examining the nine existing published reports with the authors paying attention to methodology and design of these limited studies. Normal testicular function requires a temperature of 2-4 degrees celsius below body temperature. This testicular temperature is regulated by: the ability of the scrotum to dissipate heat, no subcutaneous fat, the total surface area of the scrotum changes with temperature and the counter current heat exchange in the spermatic cord. Examples of occupational heat exposure and male infertilty are discussed ranging from parapalegic men with scrotal temperatures 0.9 degrees celsius higher than average to bakers in France, who achieved pregnancy in three months at a rate of 14% compared to 55% of the control group. The authors conclude that occupational heat exposure is a significant risk for male infertilty, affecting sperm morphology and results in delayed conception.
Comment: A question which is commonly asked, but one for which the data previously had been speculative. Not conclusive, but thoroughly believable.
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