The findings suggest that having a more physically active lifestyle may improve sperm quality, said study researcher Audrey Gaskins, a doctoral student at Harvard School of Public Health. Previous studies have found that being obese and eating a high-fat die are risk factors for lower sperm counts.

However, the new study only found an association, and cannot prove that a sedentary lifestyle lowers sperm count. The researchers also don't know if the lower sperm counts seen in the study would have an effect on the men's fertility.

Given the benefits of a healthy lifestyle, the findings make sense, said Dr. Andrew Kramer, a urologist at the University of Maryland Medical Center, who was not involved in the study. But future studies will be needed to determine if increasing exercise in sedentary men will actually improve their sperm counts, Kramer said.

All the men involved in the study were enrolled at the University of Rochester in N.Y. in 2009 and 2010. They were asked about their levels of physical activity and TV watching during the previous three months. More than half of the men were of normal weight, and 75 percent were nonsmokers.

The study is published today (Feb. 4) in the British Journal of Sports Medicine.

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