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    Recreational physical activity and the risk of breast cancer in postmenopausal women: the Women's Health Initiative Cohort Study

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    Authors
    McTiernan, Anne
    Kooperberg, Charles L.
    White, Emily
    Wilcox, Sara
    Coates, Ralph
    Adams-Campbell, Lucile L.
    Woods, Nancy F.
    Ockene, Judith K.
    UMass Chan Affiliations
    Department of Medicine, Division of Preventive and Behavioral Medicine
    Document Type
    Journal Article
    Publication Date
    2003-09-10
    Keywords
    Aged
    Breast Neoplasms
    *Exercise
    Female
    Humans
    Incidence
    Middle Aged
    Postmenopause
    Prospective Studies
    Recreation
    Risk
    Life Sciences
    Medicine and Health Sciences
    Women's Studies
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    Link to Full Text
    http://dx.doi.org/10.1001/jama.290.10.1331
    Abstract
    CONTEXT: Women who are physically active have a decreased risk for breast cancer, but the types, amounts, and timing of activity needed are unknown. OBJECTIVE: To prospectively examine the association between current and past recreational physical activity and incidence of breast cancer in postmenopausal women. DESIGN, SETTING, PATIENTS: Prospective cohort study in 74 171 women aged 50 to 79 years who were recruited by 40 US clinical centers from 1993 through 1998. MAIN OUTCOME MEASURE: Incident invasive and in situ breast cancer. RESULTS: We documented 1780 newly diagnosed cases of breast cancer over a mean follow-up of 4.7 years. Compared with less active women, women who engaged in regular strenuous physical activity at age 35 years had a 14% decreased risk of breast cancer (relative risk [RR], 0.86; 95% confidence interval [CI], 0.78-0.95). Similar but attenuated findings were observed for strenuous physical activity at ages 18 years and 50 years. An increasing total current physical activity score was associated with a reduced risk for breast cancer (P =.03 for trend). Women who engaged in the equivalent of 1.25 to 2.5 hours per week of brisk walking had an 18% decreased risk of breast cancer (RR, 0.82; 95% CI, 0.68-0.97) compared with inactive women. Slightly greater reduction in risk was observed for women who engaged in the equivalent of 10 hours or more per week of brisk walking. The effect of exercise was most pronounced in women in the lowest tertile of body mass index (BMI) (CONCLUSIONS: These data suggest that increased physical activity is associated with reduced risk for breast cancer in postmenopausal women, longer duration provides most benefit, and that such activity need not be strenuous.
    Source
    JAMA. 2003 Sep 10;290(10):1331-6. Link to article on publisher's site
    DOI
    10.1001/jama.290.10.1331
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/50882
    PubMed ID
    12966124
    Related Resources
    Link to article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1001/jama.290.10.1331
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