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Muscle-strengthening activity and its association with insulin sensitivity

¹Diabetes Translation Centers for Disease Control and Prevention Atlanta, GA

ycc1{at}cdc.gov

ABSTRACT

Objective -: Muscle-strengthening activity (MSA) may increase insulin sensitivity, thereby reducing the risk of diabetes. The purpose of this study was to assess the relationship between MSA and insulin sensitivity among American adults.

Research Design and Methods -: We analyzed data on 4,504 adults without diabetes aged 20 to 79 years who participated in the National Health and Nutrition Examination Survey 1999-2004 and had information on MSA. Self-reported frequency (times/week) of MSA was grouped as low (<1), moderate (1-2.9), or high ( 3). Insulin sensitivity was measured by the fasting Quantitative Insulin Sensitivity Check Index x 100 (QUICKI).

Results -: After adjustment for age, race/ethnicity, physical activity other than MSA, body mass index, smoking, alcohol consumption, and daily total caloric intake, the mean values for QUICKI by low, moderate, and high MSA were, respectively, 33.6, 33.9, and 34.2 (P for linear trend = 0.008) for men, and 34.2, 34.6, 34.6 (P for linear trend = 0.009) for women. Mean fasting insulin (pmol/l) concentrations were 75.0, 68.9, and 65.9 (P for linear trend = 0.017) for men, and 66.9, 63.3, 61.2 (P for linear trend = 0.007) for women. There were no significant differences across MSA groups for fasting glucose among men or women.

Conclusions -: MSA is independently associated with higher insulin sensitivity among U.S. adults. Efforts to increase MSA may be a realistic, feasible, and effective method of reducing insulin resistance among the U.S. population.

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