| Effects of ingesting protein in combination with carbohydrate during exercise on endurance performance: a systematic review with meta-analysis. | |
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MedLine Citation:
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PMID: 20683237 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Coingestion of protein with carbohydrate has been shown to enhance muscle recovery, particularly after intense bouts of exercise. However, performance benefits of ingesting a protein-carbohydrate drink during exercise remains unclear. Therefore, we used a systematic review with meta-analysis to examine the influence of protein ingestion during exercise on subsequent endurance performance. Eleven qualifying studies were included that contained 3 time-trial and 8 time-to-exhaustion cycling protocols. Only 3 of these studies controlled for caloric content and contained an isocaloric trial. Of the 11, 4 reported significant differences between a control and protein trial; however, none of these were isocaloric studies. The 3 time-trial protocols showed no significant improvement with protein. The meta-analysis of the time-trial studies revealed no significant overall effect (p = 0.73), whereas meta-analysis of time-to-exhaustion studies revealed a significant effect (p = 0.008). Of the time-to-exhaustion trials, the isocaloric studies found no significant effect (p = 0.71), whereas the isocarbohydrate studies revealed a significant effect (p = 0.05). The average percent improvement with ingestion of protein was 9.0%. The isocarbohydrate studies reported an improvement of 10.5%, whereas the isocaloric studies revealed a 3.4% improvement. We conclude that compared to carbohydrate alone, coingestion of protein and carbohydrate during exercise demonstrated an ergogenic effect on endurance performance when assessed by time to exhaustion and also where supplements were matched for carbohydrate (isocarbohydrate). Thus, the ergogenic effect of protein seen in isocarbohydrate studies may be because of a generic effect of adding calories (fuel) as opposed to a unique benefit of protein. Further research is warranted before a clear conclusion can be drawn. |
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Authors:
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Rebecca L Stearns; Holly Emmanuel; Jeff S Volek; Douglas J Casa |
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Publication Detail:
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Type: Journal Article; Meta-Analysis; Review |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 24 ISSN: 1533-4287 ISO Abbreviation: J Strength Cond Res Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-04 Completed Date: 2010-11-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: United States |
Other Details:
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Languages: eng Pagination: 2192-202 Citation Subset: IM |
Affiliation:
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Human Performance Laboratory, Department of Kinesiology, University of Connecticut, Storrs, Connecticut, USA. rebecca.stearns@uconn.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Dietary Carbohydrates
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pharmacology* Dietary Proteins / pharmacology* Energy Intake / physiology Exercise / physiology* Humans Physical Endurance / drug effects, physiology* |
| Chemical | |
Reg. No./Substance:
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0/Dietary Carbohydrates; 0/Dietary Proteins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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