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Diabetes Care, Vol 21, Issue 4 555-562, Copyright © 1998 by American Diabetes Association
Physical activity and NIDDM in African-Americans. The Pitt County Study
SA James, L Jamjoum, TE Raghunathan, DS Strogatz, ED Furth and PG Khazanie
Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor 48109, USA. sjames@umich.edu
OBJECTIVE: Studies directly examining the association between physical
activity and NIDDM in African-Americans are rare. Consequently, the
strength of this association in this ethnic minority group remains unclear.
The current study broadly characterizes the types of physical activity
engaged in by a community sample of working-class African-Americans and
then quantifies the association between physical activity and NIDDM risk in
this population. RESEARCH DESIGN AND METHODS: During the 1993 reexamination
of participants in the Pitt County Study in North Carolina, data on NIDDM
history, current use of insulin or oral hypoglycemic drugs, and
approximately 12-h overnight fasting blood glucose (FBG) were obtained from
598 women and 318 men, ages 30-55 years. The presence of NIDDM was
determined by current insulin or medication use and FBG > or = 140
mg/dl. Study participants were assigned to one of four categories of
physical activity: strenuous, moderate, low, or inactive. RESULTS: The
weighted prevalence of NIDDM in the sample was 7.1%. After adjustment was
made for age, sex, education, BMI, and waist-to-hip ratio, NIDDM risk for
moderately active subjects was one-third that for the physically inactive
subjects (odds ratio [OR], 0.35; 95% CI, 0.12-0.98). The ORs for low (OR,
0.51; 95% CI, 0.20-1.29) and strenuous (OR, 0.65; 95% CI, 0.26-1.63)
activity also tended to be lower. A summary OR that contrasted any activity
versus no activity was 0.51 (95% CI, 0.23-1.13). CONCLUSIONS: Moderate
physical activity was strongly associated with reduced risk for NIDDM in
this sample. While replication of these findings is needed, public health
interventions designed to increase moderate (leisure-time) physical
activity in black adults should be strongly encouraged.

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Copyright © 1998 by the American Diabetes Association.
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