Three hours of vigorous exercise a week can reduce a man's heart attack risk by 22%, a new study suggests.
The Harvard School of Public Health researchers also found that about 38% of that decreased risk was due to the beneficial effects of exercise on a man's levels of "good" high-density lipoprotein (HDL) cholesterol.
The findings were published Oct. 4 the journal Medicine & Science in Sports & Exercise.
The study included 1,239 men in the Health Professionals Follow-Up Study who provided information on their weekly amount of exercise. The researchers also analyzed the men's cholesterol levels, as well as biomarkers of inflammation and insulin sensitivity.
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