Men who spend more time riding a bicycle could be pedalling their fertility away, suggests a new study.The research showed that those riding more than 180 miles a week had fewer than four per cent normal sperm. It means their chance of fatherhood is extremely low.The research was presented at the 25th annual conference of the European Society of Human Reproduction and Embryology.Professor Diana Vaamonde, from the University of Cordoba Medical School, Cordoba, Spain, said that the triathletes who did the most cycling training had the worst sperm morphology.Vaamonde and team had previously shown that both high exercise intensity and high exercise volume may be detrimental to sperm quality. They decided to take a more profound look at the sportsmen who seemed to show the greatest alteration - the triathletes - and assess the correlation between the volume of training in each activity and sperm quality.
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