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Postprandial triglyceride and free fatty acid metabolism in obese women after either endurance or resistance exercise.
MedLine Citation:
PMID:  23580597     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We investigated the effects of two exercise modalities on postprandial triglyceride (TG) and free fatty acid (FFA) metabolism. Sedentary, obese women were studied on 3 occasions in randomized order: Endurance exercise for 60 min at 60-65% VO2peak (E), ~60 min high-intensity resistance exercise (R), and a sedentary control trial (C). After exercise, a liquid mixed meal containing [U-(13)C]palmitate was consumed and subjects were studied over 7 hours. Isotopic enrichment (IE) of plasma TG, plasma FFA, and breath carbon dioxide, compared with meal IE, indicated contribution of dietary fat to each pool. Total and endogenously derived plasma TG content was significantly reduced in both E and R compared to C (P<0.05) with no effect of exercise on circulating exogenous (meal-derived) TG content. Exogenous plasma FFA content was significantly increased following both E and R compared with C (P<0.05), while total and endogenous FFA concentrations were elevated only in E (P<0.05) compared with C. Fatty acid oxidation rates were significantly increased after E and R as compared with C (P<0.05) with no difference between exercise modalities. The present results indicate that E and R may be equally effective in reducing postprandial plasma TG concentration and enhancing lipid oxidation when the exercise sessions are matched for duration rather than for energy expenditure. Importantly, tracer results indicated that the reduction in postprandial lipemia after E and R exercise bouts is not achieved by enhanced clearance of dietary fat, but rather is achieved by reduced abundance of endogenous fatty acids in plasma TG.
Authors:
Patrick M Davitt; Shawn M Arent; Marc A Tuazon; Devon L Golem; Gregory C Henderson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-4-11
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  -     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-4-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Rutgers University.
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