3 hours of vigorous exercise may cut heart attack risk

October 5, 2011

That's the finding of a study in the Journal of American College of Sports Medicine. It also found that about 38 percent of the decreased risk was due to the beneficial effects of exercise on a man's levels of good cholesterol.

The study also found those who exercised had higher levels of vitamin D, probably from being out in the sun more.

Vigorous exercise included running, jogging, playing basketball or soccer for three or more hours a week.

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