A cyclist crosses Southwark Bridge commuter route "Highway" bicycle at the Centre of London, July 30, 2010.
Credit: Reuters/Toby MelvilleNEW YORK | Thursday, December 9, 2010 10: 14 pm EST
NEW YORK (Reuters) - exercise more seems to have little relation to the quality or quantity of sperm, but men who have less than five hours per week of cycling active sperm less and less than the men who exercise, a study said.
Research among competitive athletes has linked to bike in genital or urinary tract problems and poor sperm quality, said Lauren Wise, Boston University, who led the study, published in "Fertility and Sterility.
"However, we uncertain whether we would find an association between a sample of men engaged in concentrations moderate physical activity," she told Reuters Health, it is still too early to tell regular bike caused problems of semen in custody.
Previous research suggested that competitive athletes may have problems with sperm. But the study focused on the relationship between sperm health and exercise 2 200 men mean attending fertility clinics.
Every man has provided a sample of semen and answered questions about their general State of health and physical activity.
After adjusting for the use of multivitamins, body weight, blood pressure, choice of underwear and other variables, the authors found that men who exercised regularly – even vigorously - were more likely to have problems with the quality or quantity of their sperm than men who have never exercised.
However, when the wise and his colleagues looked for specific types of exercise, they saw that the men who said they spent at least five hours a week bike were twice as likely to have a low number of sperm and relatively poor sperm motility.
Men who did not have regular exercise, 23 per cent had low sperm counts – but has more than 31% of those who bike at least five hours a week.
Almost 40% of frequent cyclists had low number of spermatozoa with good motility, compared to 27% of men who exercise.
Trauma or temperature increases in the scrotum may explain the relationship between bike and sperm health said Wise.
She also noted that it was possible that men included in the study can not step representative of the population, since they were all attending them a fertility clinic and therefore more likely to have problems with sperm.
«More studies are needed to replicate the results until they can be regarded as causal,» she says.
SOURCE: link.reuters.com/qaq49q (report by Alison McCook Reuters Health; editing by Elaine Lies)
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