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Long-distance Biking Linked to Infertility in Males
A team led by Diana Vaamonde of the University of Cordoba Medical School in Spain looked at triathletes, athletes who run, swim and cycle, to further a probe into a long-suspected link between male infertility and long-distance biking.
They looked at semen provided by 15 healthy Spanish triathletes whose training routines were known in detail.
The more time the triathletes spent in the saddle, the worse their sperm morphology, or appearance, looked.
"While all triathletes had less than 10 percent of normal-looking sperm, the men with less than four percent, at which percentage they would generally be considered to have significant fertility problems, were systematically covering over 300 kilometres (180 miles) per week on their bicycles," Vaamonde said.
No such link was seen for running and swimming.
The study was released in Amsterdam at the annual conference of the European Society of Human Reproduction and Embryology (ESHRE).
The association between endurance cycling and male infertility first surfaced half a dozen years ago, in research among mountain bikers.
The suspected causes include irritation and compression of the testes against the saddle and localised heat caused by tight clothing. Sperm production is affected by excess heat.
But Vaamonde said there could be additional reasons, including rogue oxygen molecules that are boosted by local stress and which damage cell structures.
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More News on: In Vitro Fertilization (IVF), Infertility, Vaginitis, Egg Donation, Artificial Insemination , Polycystic Ovarian Syndrome, Dilatation and Curettage, Varicocele, Drugs Causing Sexual Problems
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