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1 Human Performance Laboratory, Department of Exercise and Sports Science, East Carolina University, Greenville, North Carolina, United States
2 Nutritional Sciences and Internal Medicine, University of Missouri, Columbia, Missouri, United States; Research, Harry S. Truman VA Hospital, 800 Hospital Drive, Columbia, 65211, United States
3 Human Performance Laboratory, Department of Exercise and Sports Science, East Carolina University, Greenville, North Carolina, United States; Department of Physiology, Brody School of Medicine, Greenville, North Carolina, United States
* To whom correspondence should be addressed. E-mail: hicknerr{at}mail.ecu.edu.
The purpose of this study was to investigate the effect of acute resistance exercise (RE) on lipolysis and substrate oxidation in adipose tissue. Lipolysis and blood flow were measured in subcutaneous abdominal adipose tissue via microdialysis before, during, and 5 h following RE as well as on a non-exercise control day (C) in 8 young (24 ± 0.7 years), active male participants. Fat oxidation was measured immediately before and after RE via indirect calorimetry for 45 min. Glycerol concentration was higher during (C: 112.4 ± 13.1 vs. RE: 200.4 ± 38.6 micromol/L, 78% difference, p=.02) and immediately following RE (C: 105 ± 14.6 vs. RE: 184 ± 41 micromol/L, 75% difference, p=.03). Energy expenditure was elevated in the 45 min after RE compared to the same time period on the control day (C: 94.5 ± 4.0 vs. RE: 104.4 ± 6.0 kcal/hr, 10.5% difference, p=.03). Respiratory exchange ratio (RER) was lower (C: 0.85 ± .03 vs. RE: 0.71 ± .004, 16.5% difference, p=.004) and fat oxidation was higher (C: 5.0 ± 1.0 vs. RE: 10.2 ± 0.8, 105% difference, p=.004) following RE compared to the same time period on the control day. Therefore, the mechanism behind RE contributing to improved body composition is in part due to enhanced abdominal subcutaneous adipose tissue lipolysis and improved whole body fat oxidation and energy expenditure in response to RE.
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