A study of more than 3,000 Long Island women found that those who did 10 to 19 hours of exercise a week had about a 30 percent lower risk of getting breast cancer than those who were sedentary.
The study, published Monday in the journal Cancer , also found that gaining a substantial amount of weight after menopause may eliminate the benefits of exercise.
The study used data from 1,504 Long Island women ages 20-98 with breast cancer and 1,555 similar women without the disease. They were part of the Long Island Breast Cancer Study Project, government-funded studies designed to look at possible environmental causes of breast cancer on Long Island .
The studies haven’t identified any environmental factors that could be responsible for the incidence of the disease. The women were interviewed in the early 1990s about their exercise habits and other lifestyle factors, such as smoking and drinking, over their lifetime.
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