| Effects of dietary glycaemic response after exercise on blood concentrations of substrates used indirectly for muscle glycogenesis. | |
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MedLine Citation:
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PMID: 17402488 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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REASONS FOR PERFORMING STUDY: Exercise depletes muscle glycogen stores, which could subsequently impair performance. Muscle glycogen replenishment is determined by substrate availability. OBJECTIVES: To study the effects of feeding meals of varying glycaemic responses on blood concentrations of substrates used for glycogenesis in horses with exercise-induced glycogen depletion. METHODS: In a 3-way crossover study, 7 horses received each of 3 isocaloric diets for 72 h after undergoing glycogen-depleting exercise: 1) a high soluble-carbohydrate diet, which induced a high-glycaemic (HGI) response; 2 and 3) a low soluble-carbohydrate or a mixed soluble-carbohydrate diet (control group), which both induced a similar low-to-moderate glycaemic (LGI) response. Muscle biopsies and venous samples were collected before and up to 72 h after exercise. RESULTS: Feeding HGI diet resulted in a higher (P<0.001) rate of muscle glycogenesis over 72 h compared to LGI diets. Plasma glycerol, triglyceride, lactate, serum NEFA and total protein concentrations, and haematocrit were significantly (P<0.001) higher after compared to before exercise. Whereas no significant overall dietary effect was observed on these metabolites over 72 h, there was a tendency for glycerol, NEFA and triglyceride concentrations to be lower for LGI compared to HGI diets over 6 h after exercise (P<0.05; 1, 6 and 4-6 h after exercise, respectively). CONCLUSIONS: These data suggest that horses fed LGI meals after exercise had limited lipid utilisation without any significant shift of substrate utilisation toward gluconeogenesis, which could have contributed to the slower rate of muscle glycogenesis compared to horses fed HGI diets. |
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Authors:
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V A Lacombe; K W Hinchcliff; C W Kohn; S M Reed; L E Taylor |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Equine veterinary journal. Supplement Volume: - ISSN: - ISO Abbreviation: Equine Vet J Suppl Publication Date: 2006 Aug |
Date Detail:
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Created Date: 2007-04-03 Completed Date: 2007-05-02 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9614088 Medline TA: Equine Vet J Suppl Country: England |
Other Details:
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Languages: eng Pagination: 585-9 Citation Subset: IM |
Affiliation:
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Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio 43210, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed
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analysis,
classification Animal Nutritional Physiological Phenomena* Animals Area Under Curve Cross-Over Studies Dietary Carbohydrates / administration & dosage, classification, metabolism* Glycemic Index Glycogen / biosynthesis* Horses / metabolism*, physiology Male Muscle, Skeletal / metabolism* Physical Conditioning, Animal / physiology* Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Dietary Carbohydrates; 9005-79-2/Glycogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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