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Cycling May Take Toll on Sperm Quality

By Harry Kimball,  Newser Staff

Posted Jul 11, 2009 12:25 PM CDT

(Newser) – Men who train vigorously on bicycles have low sperm quality verging on infertility, LiveScience reports. A recent study of Spanish triathletes found that those who rode more than 180 miles a week saw the percentage of healthy sperm drop from a group average of 10% to 4%. “We found a statistically adverse correlation between sperm morphology and the volume of cycling training undertaken per week,” the lead researcher says.

“Moreover,” the researcher says ominously, “normal physiological homeostasis—the body’s ability to regulate its own environment—may become irreversibly altered, therefore resulting in complex anomalies.” The researchers surmise that the heat and vigor of the exercise, coupled with “repeated mechanical trauma to the testicles,” are responsible. Casual riders need not worry—only the extreme cases have been linked to low count and irreparable damage.

Riders compete in an indoor event.
Riders compete in an indoor event.   (AP Photo)
Gustav Larsson of Sweden rides in the Tour de France.
Gustav Larsson of Sweden rides in the Tour de France.   (AP Photo)
Mountain bikers are also adversely effected.
Mountain bikers are also adversely effected.   (AP Photo)
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