Impact of Hormone Replacement Therapy on Exercise Training-Induced Improvements in Insulin Action in Sedentary Overweight Adults

ECU Author/Contributor (non-ECU co-authors, if there are any, appear on document)

Brian H. Annex (Creator)

Brian D. Duscha (Creator)

Josep A. Houmard (Creator)

Kim M. Huffman (Creator)

Johanna L. Johnson (Creator)

William E. Kraus (Creator)

Gregory P. Samsa (Creator)

Cris A. Slentz (Creator)

Charles J. Tanner (Creator)

Institution

East Carolina University (ECU )

Web Site: http://www.ecu.edu/lib/

Abstract: Exercise training (ET) and hormone replacement therapy (HRT) are both recognized influences on insulin action but the influence of HRT on responses to ET has not been examined. In order to determine if HRT use provided additive benefits for the response of insulin action to ET we evaluated the impact of HRT use on changes in insulin during the course of a randomized controlled aerobic ET intervention. Subjects at baseline were sedentary dyslipidemic and overweight. These individuals were randomized to six months of one of three aerobic ET interventions or continued physical inactivity. In 206 subjects an insulin sensitivity index (SI) was obtained with a frequently ampled intravenous glucose tolerance test pre- and post-ET. Baseline and post-intervention fitness regional adiposity general adiposity skeletal muscle biochemistry and histology and serum lipoproteins were measured as other putative mediators influencing insulin action. Two-way analyses of variance were used to determine if gender or HRT use influenced responses to exercise training. Linear modeling was used to determine if predictors for response in SI differed by gender or HRT use. Women who used HRT (HRT+) demonstrated significantly greater improvements in SI with ET than women not using HRT (HRT-). In those HRT+ women plasma triglyceride change best orrelated with change in SI. For HRT- women capillary density change and for men subcutaneous adiposity change best correlated with change in SI. In summary in an ET intervention HRT use appears associated with more robust responses in insulin action. Also relationships between ET induced changes in insulin action and potential mediators of change in insulin action are different for men and for women on or off HRT. These findings have implications for the relative utility of ET for improving insulin action in middle-aged men and women particularly in the setting of differences in HRT use. Address Originally published Metabolism Vol. 57 No. 7 July 2008

Additional Information

Publication

Other

Metabolism. 57:7(July 2008) p. 888-895.

Language: English

Date: 2011

Keywords

hormone replacement therapy, Exercise training, insulin action, Gender, subcutaneous adiposity

Email this document to