| Effects of carbohydrate and caffeine ingestion on performance during a rugby union simulation protocol. | |
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MedLine Citation:
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PMID: 20521199 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this study, we investigated the effect of ingesting carbohydrate alone or with caffeine on performance of a rugby union-specific shuttle running protocol. On three occasions, at least one week apart in a counterbalanced trial order, eight male rugby union forwards ingested either placebo or carbohydrate (1.2 g x kg(-1) body mass x h(-1)) before and during a rugby union-specific protocol, with pre-exercise caffeine ingestion (4 mg x kg(-1)) before one of the carbohydrate trials (carbohydrate + caffeine). The intermittent exercise protocol included walking, jogging, and cruising at pre-determined intensities, simulated contact events, a sustained high-intensity test of speed and agility (Performance Test), and a 15-m sprint. Ratings of perceived exertion (RPE) were recorded every 5 min and a motor skills test was performed after each 21-min block. Performance Test times were not significantly different between trials but the likelihood of 2% improvements for carbohydrate + caffeine over placebo and carbohydrate were 98% and 44%, respectively. For carbohydrate + caffeine, 15-m sprints were faster than for placebo (P=0.05) and the motor skills test was performed faster in the carbohydrate + caffeine trial than the carbohydrate and placebo trials (P < 0.05), while RPE was lower in the carbohydrate + caffeine trial than the carbohydrate and placebo trials (P < 0.05). The results indicate a likely benefit to rugby performance following co-ingestion of carbohydrate and caffeine. |
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Authors:
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Simon P Roberts; Keith A Stokes; Grant Trewartha; Jenny Doyle; Patrick Hogben; Dylan Thompson |
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Publication Detail:
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Type: Clinical Trial; Journal Article |
Journal Detail:
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Title: Journal of sports sciences Volume: 28 ISSN: 1466-447X ISO Abbreviation: J Sports Sci Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-14 Completed Date: 2010-12-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8405364 Medline TA: J Sports Sci Country: England |
Other Details:
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Languages: eng Pagination: 833-42 Citation Subset: IM |
Affiliation:
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Sport and Exercise Science Research Group, School for Health, University of Bath, Bath, UK. spsspr@bath.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Athletic Performance / physiology* Caffeine / pharmacology* Coffea / chemistry Dietary Carbohydrates / pharmacology* Football / physiology* Humans Male Motor Skills / drug effects* Physical Exertion / drug effects* Plant Extracts / pharmacology Running / physiology Time Factors Walking / physiology Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Dietary Carbohydrates; 0/Plant Extracts; 58-08-2/Caffeine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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