Physical exercise has generally been associated with reduced risk of breast cancer. However, evidence of this association in African Americans women is limited. Now results from a study funded by the National Cancer Institute (NCI) published in Cancer Epidemiology, Biomarkers & Prevention, researchers from Boston University’s Slone Epidemiology Center demonstrates that there is indeed ample evidence linking physical exercise to a lower rate of breast cancer in African American women, a group in which previous evidence has been lacking.
According to the study, regular exercise, including brisk walking, is associated with a decrease in the incidence of breast cancer in African American women.
… Although the link between physical exercise and breast cancer incidence has been recognized, most study participants have been white women… This is the first large scale study to support that vigorous exercise may decrease incidence of breast cancer in African American women…
The large prospective study of the health of black women, the Black Women’s Health Study(BWHS), researchers collected information about exercise habits, such as time spent exercising per week and type of exercise. They followed more than 44,000 African American women over a span of 16 years and observed whether they developed breast cancer.
Less likely to develop breast cancer
The researchers found that women who exercised vigorously for seven or more hours each week were 25% less likely to develop breast cancer, compared to those who exercised less than one hour each week. Examples of vigorous activity include basketball, swimming, running and aerobics. The results were similar if women walked briskly, but there was no benefit for walking at normal pace. The results did not differ by the estrogen receptor status of the breast cancer.
Lynn Rosenberg, ScD, professor of Epidemiology at Boston University School of Public Health and principal investigator of the Black Women’s Health Study, states, “Although expert review panels have accepted a link between physical exercise and breast cancer incidence, most study participants have been white women. This is the first large scale study to support that vigorous exercise may decrease incidence of breast cancer in African American women.”
For more information:
Rosenberg L, Palmer JR, Bethea TN, Ban Y, Kipping-Ruane K, Adams-Campbell LL. A prospective study of physical activity and breast cancer incidence in African American women. Cancer Epidemiol Biomarkers Prev. 2014 Aug 7. pii: cebp.0448.2014. [Article][PubMed]
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