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Vigorous Exercise Associated With Reduced Breast Cancer Risk

October 8, 2009.  October is Breast Cancer Awareness Month and there’s good news for post-menopausal women.  Engaging in moderate to vigorous exercise may result in a reduced risk of breast cancer.

Nearly 700,000 American women are diagnosed with cancer according to the American Association for Critical Illness Insurance.  About one quarter (26%) have breast cancer recognized as the most common cancer affecting U.S. women,

Researchers writing the open access journal BMC Cancer investigated the link between breast cancer and exercise.  According to the international team of researchers headed by the U.S. National Cancer Institute, Bethesda, Maryland, this new study is one of the first prospective investigations to look at the importance of various intensities of exercise at different stages in an individual’s life. 

Over 110,000 post menopausal women were asked to rate their level of physical activity at ages 15-18, 19-29, 35-39, and in the past 10 years. It was found, over 6.6 years of follow up, that women who engaged in more than 7 hours per week of moderate-to-vigorous exercise for the last ten years were 16% less likely to develop breast cancer than those who were inactive. 

No link was observed between breast cancer risk and physical activity in women who were active at a younger age.  The findings could help inform the mechanisms of the physical activity-breast cancer relationship.

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