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American Journal of Epidemiology Advance Access originally published online on December 4, 2008
American Journal of Epidemiology 2009 169(4):428-434; doi:10.1093/aje/kwn344
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American Journal of Epidemiology © The Author 2008. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

ORIGINAL CONTRIBUTIONS

Physical Activity and Television Watching in Relation to Risk of Type 2 Diabetes

The Black Women's Health Study

Supriya Krishnan, Lynn Rosenberg and Julie R. Palmer

Correspondence to Dr. Julie R. Palmer, Slone Epidemiology Center, 1010 Commonwealth Avenue, 4th Floor, Boston, MA 02215 (e-mail: jpalmer{at}slone.bu.edu).

Received for publication March 24, 2008. Accepted for publication October 1, 2008.

Few modifiable risk factors for type 2 diabetes have been documented in the high-risk population of US black women. The authors used data from 45,668 black women aged 21–69 years, followed biennially from 1995 to 2005 in the Black Women's Health Study, to estimate incidence rate ratios for type 2 diabetes comparing various levels of physical activity and television watching. Cox proportional hazards models were used to control confounding factors. During 10 years of follow-up, 2,928 incident cases of type 2 diabetes were identified. Vigorous activity was inversely associated with type 2 diabetes risk (Ptrend < 0.0001); the incidence rate ratio for ≥7 hours per week was 0.43 (95% confidence interval (CI): 0.31, 0.59) relative to no activity. Brisk walking for ≥5 hours per week was associated with reduced type 2 diabetes risk (incidence rate ratio = 0.67, 95% CI: 0.49, 0.92) relative to no walking. Television watching was associated with an increased type 2 diabetes risk: The incidence rate ratio was 1.86 (95% CI: 1.54, 2.24) for ≥5 hours relative to <1 hour of television per day, independent of physical activity. These observational data suggest that black women might reduce their risk of developing type 2 diabetes by increasing their time spent walking or engaged in vigorous physical activity and by limiting television watching.

African continental ancestry group; diabetes mellitus, type 2; exercise; incidence; motor activity; television; walking; women's health

Abbreviations: BWHS, Black Women's Health Study; CI, confidence interval; MET, metabolic equivalent


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