| Effect of Ramadan fasting on fuel oxidation during exercise in trained male rugby players. | |
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MedLine Citation:
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PMID: 17296516 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The aim of this study was to assess the effect of Ramadan fasting on substrate oxidation in trained athletes during moderate-intensity exercise. METHODS: Nine trained men (age: 19+/-2 yr, Height: 1.78+/-0.74 m) were tested on three occasions: during a control period immediately before Ramadan (C), at the end of the first week (Beg-R), and during the fourth week of Ramadan (End-R). On each occasion, they performed submaximal cycle ergometer exercise, with work-rates that were increased progressively (loadings corresponding to 20, 30, 40, 50, 60% of Wmax). Steady-state substrate oxidation was evaluated by indirect calorimetry. RESULTS: Participants showed significant decreases in body mass and body fat at the end of Ramadan, relative to initial control values (P<0.001). The daily food intake was also reduced during Ramadan (P<0.01). Haemoglobin concentrations and hematocrit were significantly higher at the end-Ramadan, both at rest (P<0.001 and P<0.0001 respectively) and after exercise, (P<0.05 and P<0.01 respectively) compared to control measurements made before Ramadan. At the end of Ramadan, our subjects had increased their fat utilization during exercise. The cross-over was observed at a higher intensity at the End-R (35% vs. 30% of Wmax, P<0.001). For the same power output, the Lipox max was also higher at the End-R, compared to control value (265+/-38 vs. 199.1+/-20 mg/min, P<0.001). CONCLUSION: Ramadan fasting increases the lipid oxidation of trained athletes during submaximal exercise. The increased fat utilisation may be related to decreases in body mass and body fat content. |
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Authors:
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E Bouhlel; Z Salhi; H Bouhlel; S Mdella; A Amamou; M Zaouali; J Mercier; X Bigard; Z Tabka; A Zbidi; R J Shephard |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Diabetes & metabolism Volume: 32 ISSN: 1262-3636 ISO Abbreviation: Diabetes Metab. Publication Date: 2006 Dec |
Date Detail:
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Created Date: 2007-02-13 Completed Date: 2007-04-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9607599 Medline TA: Diabetes Metab Country: France |
Other Details:
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Languages: eng Pagination: 617-24 Citation Subset: IM |
Affiliation:
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Unité de Recherche de l'Institut Supérieur du Sport et de l'Education Physique, Kef, Tunisie. e.bouhlel@wanadoo.tn |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Glucose / metabolism Energy Intake* Exercise* Exercise Test Fasting / physiology* Football* Hemoglobin A, Glycosylated / analysis Humans Islam* Male Tunisia |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Hemoglobin A, Glycosylated |
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