Can cycling damage sperm?

Spanish researchers have found that serious cycle training seems to damage sperm. They looked at a group of triathletes, and found that those who focused on cycling in their training had the poorest sperm quality. Apparently the time spent training and the distance cycled could be seen to have direct links with the quality of sperm. It isn't clear why this should be, although it is possible that it is due to heat damage or compression. You can read more on the report released at ESHRE this week at www.eshre.com