Reduce Breast Cancer Risk by Exercising "Context: Women who are physically active have a decreased risk for breast cancer but the types, amounts, and timing of activity needed 'have been] unknown.

"Objective: To ...examine the association between current and past recreational activity and incidence of breast cancer in postmenopausal women.

"Design...74,171 women aged 50 to 79 years were recruited by 40 US clinical centers...

"Results: We documented 1780 newly diagnosed cases of breast cancer...Compared with less active women, women who engaged in regular strenuous physical activity at 50 'had a similarly reduced risk as younger women.]...Women who engaged in the equivalent of 1.25 to 2.5 hours a week of brisk walking had an 18% decreased risk of breast cancer compared with inactive women."

"Conclusions: These data suggest that increased physical activity is associated with reduced risk of breast cancer in postmenopausal women..." Emphasis added.

Reduce Breast Cancer Risk by Exercising Bibliography

McTiernan, Kooperberg, White, Ockene, et al., Div. of Public Health Sciences, Fred Hutchinson Cancer Res. Ctr.; Dept. of Exercise Science, U. of S. Carolina; Div. of Cancer Preventive Control; Centers of Dis. Control and Prevention, Atlanta; School of Nursing, U. of Washington; Div. of Preventive & Behav. Med., U of Mass. Med. School.

Journal of the AM.A., vol. 290, 2003.