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Effect of exercise training on metabolic flexibility in response to a high-fat diet in obese individuals

Obese individuals typically exhibit a reduced capacity for metabolic flexibility by failing to increase fatty acid oxidation (FAO) upon the imposition of a high-fat diet (HFD). Exercise training increases FAO in the skeletal muscle of obese individuals, but whether this intervention can restore metabolic flexibility is unclear. The purpose of this study was to compare FAO in the skeletal muscle of lean and obese subjects in response to a HFD before and after exercise training. Twelve lean (means ± SE) (age 21.8 ± 1.1 yr, BMI 22.6 ± 0.7 kg/m 2 ) and 10 obese men (age 22.4 ± 0.8 yr, BMI 33.7 ± 0.7 kg/m 2 ) consumed a eucaloric HFD (70% of energy from fat) for 3 days. After a washout period, 10 consecutive days of aerobic exercise (1 h/day, 70% V̇ o 2peak ) were performed, with the HFD repeated during days 8–10 . FAO and indices of mitochondrial content were determined from muscle biopsies. In response to the HFD, lean subjects increased complete FAO (27.3 ± 7.4%, P = 0.03) in contrast to no change in their obese counterparts (1.0 ± 7.9%). After 7 days of exercise, citrate synthase activity and FAO increased ( P < 0.05) regardless of body habitus; addition of the HFD elicited no further increase in FAO. These data indicate that obese, in contrast to lean, individuals do not increase FAO in skeletal muscle in response to a HFD. The increase in FAO with exercise training, however, enables the skeletal muscle of obese individuals to respond similarly to their lean counterparts when confronted with short-term excursion in dietary lipid. skeletal muscle fat oxidation mitochondria physical activity Copyright © 2012 the American Physiological Society « Previous | Next Article » Table of Contents This Article Published online before print October 9, 2012 , doi: 10.​1152/​ajpendo.​00355.​2012 AJP - Endo December 15, 2012 vol. 303 no. 12 E1440-E1445 » Abstract Full Text Full Text (PDF) All Versions of this Article: ajpendo.00355.2012v1 303/12/E1440 most recent Classifications Article Services Email this article to a friend Alert me when this article is cited Alert me if a correction is posted Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Download to citation manager Citing Articles Load citing article information Citing articles via Web of Science Google Scholar Articles by Battaglia, G. M. Articles by Houmard, J. A. PubMed PubMed citation Articles by Battaglia, G. M. Articles by Houmard, J. A. Related Content Load related web page information Current Content December 15, 2012 Alert me to new issues of AJP - Endo About the Journal Calls for Papers Information for Authors Submit a Manuscript Ethical Policies AuthorChoice PubMed Central Policy Reprints and Permissions Advertising Press Copyright © 2012 the American Physiological Society Print ISSN: 0193-1849 Online ISSN: 1522-1555 var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-2924550-1"); pageTracker._trackPageview(); } catch(err) {} var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-189672-30"); pageTracker._setDomainName(".physiology.org"); pageTracker._trackPageview(); } catch(err) {} http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Endocrinology and Metabolism The American Physiological Society

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