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dx9.0c官方下载2011最新版，魔术英语网最新英语新闻推荐阅读：Sex and exercise can roughly triple the risk of having a heart attack, especially in people who do not get regular exercise, a U.S. study reported Wednesday.

Doctors have long known that physical activity can cause serious heart problems, but the new study helps to quantify that risk, said lead author Dr. Issa Dahabreh of Tufts Medical Center in Boston, whose study appears in the Journal of the American Medical Association.

The researchers found people are 3.5 times more likely to get a heart attack or have sudden cardiac death when they are exercising compared to when they are not.

And they are 2.7 times more likely to get a heart attack when they are having sex or immediately afterward compared with when they are not.

People who exercise regularly have a much smaller risk of having a heart attack immediately after sexual or physical activity, said Dahabreh.

"It would be really bad if someone thought our paper means people should not exercise," Dahabreh said. "If anything, it's the opposite."

The researchers said the period of increased risk is brief, and the risk for any one person is extremely low.

"These elevated risks are only for a short period of time (1 to 2 hours) during and after the physical or sexual activity," said Jessica Paulus, another Tufts researcher who worked on the study.
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