| When energy balance is maintained, exercise does not induce negative fat balance in lean sedentary, obese sedentary, or lean endurance-trained individuals. | |
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MedLine Citation:
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PMID: 19833807 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Fat oxidation during exercise is increased by endurance training, and evidence suggests that fat oxidation during exercise is impaired in obesity. Thus the primary aim of this study was to compare the acute effects of exercise on 24-h fat oxidation and fat balance in lean sedentary [LS, n = 10, body mass index (BMI) = 22.5 +/- 6.5 kg/m(2)], lean endurance-trained (LT, n = 10, BMI = 21.2 +/- 1.2 kg/m(2)), and obese sedentary (OS, n = 7, BMI = 35.5 +/- 4.4 kg/m(2)) men and women. Twenty-four-hour energy expenditure and substrate oxidation were measured under sedentary (control; CON) and exercise (EX) conditions while maintaining energy balance. During EX, subjects performed 1 h of stationary cycling at 55% of aerobic capacity. Twenty-four-hour fat oxidation did not differ on the CON or EX day in LS (43 +/- 9 vs. 29 +/- 7 g/day, respectively), LT (53 +/- 8 vs. 42 +/- 5 g/day), or OS (58 +/- 7 vs. 80 +/- 9 g/day). However, 24-h fat balance was significantly more positive on EX compared with CON (P < 0.01). Twenty-four-hour glucose, insulin, and free fatty acid (FFA) profiles were similar on the EX and CON days, but after consumption of the first meal, FFA concentrations remained below fasting levels for the remainder of the day. These data suggest that when exercise is performed with energy replacement (i.e., energy balance is maintained), 24-h fat oxidation does not increase and in fact, may be slightly decreased. It appears that the state of energy balance is an underappreciated factor determining the impact of exercise on fat oxidation. |
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Authors:
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Edward L Melanson; Wendolyn S Gozansky; Daniel W Barry; Paul S Maclean; Gary K Grunwald; James O Hill |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2009-10-15 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 107 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-12-02 Completed Date: 2010-02-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1847-56 Citation Subset: IM |
Affiliation:
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Division of Endocrinology, Metabolism, and Diabetes, Center for Human Nutrition, University of Colorado Denver, School of Medicine, Denver, Colorado 80045, USA. Ed.melanson@ucdenver.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Blood Glucose / metabolism Body Composition / physiology Body Weight / physiology* Calorimetry Diet Energy Metabolism / physiology* Exercise / physiology* Fatty Acids / blood Female Glycerol / blood Humans Insulin / blood Lipid Metabolism / physiology* Male Middle Aged Obesity / metabolism* Oxygen Consumption / physiology Patient Selection Physical Exertion / physiology Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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1UL1-RR-025780/RR/NCRR NIH HHS; K01-DK-061348/DK/NIDDK NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Fatty Acids; 11061-68-0/Insulin; 56-81-5/Glycerol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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