body in a hot tub, heated Jacuzzi or bath at a temperature warmer than body temperature for 30 minutes or more per week for at least three months prior to participation in the study. Patients were excluded from the study if they had received infertility treatments in the previous year, or if female infertility was a co-existing factor.

The only previously published study to examine this link was performed in 1965, according to the research paper. In that study, 20 men were exposed to direct scrotal wet heat for 30 minutes on six alternating days. The findings showed a temporary decline in sperm production during the treatments, but there were no details of semen quality before and after the study. An unpublished Swiss study in the 1940s had also linked wet heat to temporary male infertility.

Concern about wet heat effects on infertility crosses many cultures, Turek said, citing a centuries-old practice in Japan of barring childless men from conducting business deals in hot tubs, due to its believed effect on fertility.

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Contact: Kristen Bole
kbole@pubaff.ucsf.edu
415-476-2557
University of California - San Francisco
2-Mar-2007


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