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Effects of Ramadan Intermittent Fasting on Middle-Distance Running Performance in Well-Trained Runners.
MedLine Citation:
PMID:  21857506     Owner:  NLM     Status:  Publisher    
OBJECTIVE:: To assess whether Ramadan intermittent fasting (RIF) affects 5000-m running performance and physiological parameters classically associated with middle-distance performance. DESIGN:: Two experimental groups (Ramadan fasting, n = 9, vs control, n = 9) participated in 2 experimental sessions, one before RIF and the other at the last week of fasting. SETTING:: For each session, subjects completed 4 tests in the same order: a maximal running test, a maximal voluntary contraction (MVC) of knee extensor, 2 rectangular submaximal exercises on treadmill for 6 minutes at an intensity corresponding to the first ventilatory threshold (VT1), and a running performance test (5000 m). PARTICIPANTS:: Eighteen, well-trained, middle-distance runners. MAIN OUTCOME MEASURES:: Maximal oxygen consumption, MVC, running performance, running efficiency, submaximal &OV0312;O2 kinetics parameters (&OV0312;O2, &OV0312;O2b, time constant τ, and amplitude A1) and anthropometric parameters were recorded or calculated. RESULTS:: At the end of Ramadan fasting, a decrease in MVC was observed (-3.2%; P < 0.00001; η, 0.80), associated with an increase in the time constant of oxygen kinetics (+51%; P < 0.00007; η, 0.72) and a decrease in performance (-5%; P < 0.0007; η, 0.51). No effect was observed on running efficiency or maximal aerobic power. CONCLUSIONS:: These results suggest that Ramadan changes in muscular performance and oxygen kinetics could affect performance during middle-distance events and need to be considered to choose training protocols during RIF.
Jeanick Brisswalter; Ezzedine Bouhlel; Jean Marie Falola; Christopher R Abbiss; Jean Marc Vallier; Christophe Hauswirth
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-19
Journal Detail:
Title:  Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine     Volume:  -     ISSN:  1536-3724     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9103300     Medline TA:  Clin J Sport Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
From the *Laboratory of Human Motricity, Education Sport and Health, University of Nice Sophia Antipolis, Nice, France; †Medicine Faculty, Laboratory of Physiology, University of Sousse, Sousse, Tunisia; ‡University of d'Abomey-Calavi, Porto Novo, Benin; §School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, Australia; ¶Laboratory of Human Motricity, Education Sport and Health, University of South France Toulon Var, Toulon, France; and ‖National Institute of Sport Expertise and Performance, Paris, France.
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