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

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    Author
    Huffman, Kim M.; Slentz, Cris A.; Johnson, Johanna L.; Samsa, Gregory P.; Duscha, Brian D.; Tanner, Charles J.; Annex, Brian H.; Houmard, Joseph A.; Kraus, William E.
    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 sampled 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 correlated 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
    URI
    http://hdl.handle.net/10342/3271
    Subject
     Hormone replacement therapy; Exercise training; Insulin action; Gender; Subcutaneous adiposity 
    Date
    2008-07
    Citation:
    APA:
    Huffman, Kim M., & Slentz, Cris A., & Johnson, Johanna L., & Samsa, Gregory P., & Duscha, Brian D., & Tanner, Charles J., & Annex, Brian H., & Houmard, Joseph A., & Kraus, William E.. (July 2008). Impact of Hormone Replacement Therapy on Exercise Training-Induced Improvements in Insulin Action in Sedentary Overweight Adults. Metabolism, 57(7), 888- 895. Retrieved from http://hdl.handle.net/10342/3271

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    MLA:
    Huffman, Kim M., and Slentz, Cris A., and Johnson, Johanna L., and Samsa, Gregory P., and Duscha, Brian D., and Tanner, Charles J., and Annex, Brian H., and Houmard, Joseph A., and Kraus, William E.. "Impact of Hormone Replacement Therapy on Exercise Training-Induced Improvements in Insulin Action in Sedentary Overweight Adults". Metabolism. 57:7. (888-895), July 2008. September 21, 2023. http://hdl.handle.net/10342/3271.
    Chicago:
    Huffman, Kim M. and Slentz, Cris A. and Johnson, Johanna L. and Samsa, Gregory P. and Duscha, Brian D. and Tanner, Charles J. and Annex, Brian H. and Houmard, Joseph A. and Kraus, William E., "Impact of Hormone Replacement Therapy on Exercise Training-Induced Improvements in Insulin Action in Sedentary Overweight Adults," Metabolism 57, no. 7 (July 2008), http://hdl.handle.net/10342/3271 (accessed September 21, 2023).
    AMA:
    Huffman, Kim M., Slentz, Cris A., Johnson, Johanna L., Samsa, Gregory P., Duscha, Brian D., Tanner, Charles J., Annex, Brian H., Houmard, Joseph A., Kraus, William E.. Impact of Hormone Replacement Therapy on Exercise Training-Induced Improvements in Insulin Action in Sedentary Overweight Adults. Metabolism. July 2008; 57(7): 888-895. http://hdl.handle.net/10342/3271. Accessed September 21, 2023.
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    • Kinesiology
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    East Carolina University

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