| Effect of various carbohydrate-electrolyte fluids on cycling performance and maximal voluntary contraction. | |
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MedLine Citation:
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PMID: 20479483 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to compare the effects of a carbohydrate-electrolyte plus caffeine, carnitine, taurine, and B vitamins solution (CE+) and a carbohydrate-electrolyte-only solution (CE) vs. a placebo solution (PLA) on cycling performance and maximal voluntary contraction (MVC). In a randomized, double-blind, crossover, repeated-measures design, 14 male cyclists (M +/- SD age 27 +/- 6 yr, VO2max 60.4 +/- 6.8 ml x kg-1 x min(-1)) cycled for 120 min submaximally (alternating 61% +/- 5% and 75% +/- 5% VO2max) and then completed a 15-min performance trial (PT). Participants ingested CE+, CE, or PLA before (6 ml/kg) and every 15 min during exercise (3 ml/kg). MVC was measured as a single-leg isometric extension (70 degree knee flexion) before (pre) and after (post) exercise. Rating of perceived exertion (RPE) was measured throughout. Total work accumulated (KJ) during PT was greater (p < .05) in CE+ (233 +/- 34) than PLA (205 +/- 52) but not in CE (225 +/- 39) vs. PLA. MVC (N) declined (p < .001) from pre to post in PLA (988 +/- 213 to 851 +/- 191) and CE (970 +/- 172 to 870 +/- 163) but not in CE+ (953 +/- 171 to 904 +/- 208). At Minutes 60, 90, 105, and 120 RPE was lower in CE+ (14 +/- 2, 14 +/- 2, 12 +/- 1, 15 +/- 2) than in PLA (14 +/- 2, 15 +/- 2, 14 +/- 2, 16 +/- 2; p < .001). CE+ resulted in greater total work than PLA. CE+, but not PLA or CE, attenuated pre-to-post MVC declines. Performance increases during CE+ may have been influenced by lower RPE and greater preservation of leg strength during exercise in part as a result of the hypothesized effects of CE+ on the central nervous system and skeletal muscle. |
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Authors:
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Matthew S Ganio; Jennifer F Klau; Elaine C Lee; Susan W Yeargin; Brendon P McDermott; Maxime Buyckx; Carl M Maresh; Lawrence E Armstrong |
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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: International journal of sport nutrition and exercise metabolism Volume: 20 ISSN: 1526-484X ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-05-18 Completed Date: 2010-06-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: United States |
Other Details:
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Languages: eng Pagination: 104-14 Citation Subset: IM |
Affiliation:
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Human Performance Laboratory, University of Connecticut, Storrs, CT, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Athletic Performance Bicycling / physiology* Caffeine / administration & dosage Carnitine / administration & dosage Cross-Over Studies Dietary Carbohydrates / administration & dosage*, pharmacology Double-Blind Method Electrolytes / administration & dosage*, pharmacology Humans Isometric Contraction / drug effects, physiology* Male Muscle, Skeletal / physiology Rehydration Solutions / administration & dosage*, pharmacology Task Performance and Analysis Taurine / administration & dosage Vitamin B Complex / adverse effects Water-Electrolyte Balance / physiology |
| Chemical | |
Reg. No./Substance:
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0/Dietary Carbohydrates; 0/Electrolytes; 0/Rehydration Solutions; 107-35-7/Taurine; 12001-76-2/Vitamin B Complex; 541-15-1/Carnitine; 58-08-2/Caffeine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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