| The possible combinatory effects of acute consumption of caffeine, creatine, and amino acids on the improvement of anaerobic running performance in humans. | |
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MedLine Citation:
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PMID: 20934602 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Preexercise nutritional investigations have recently become a popular avenue of examining the interaction of multiple ingredients on exercise and training methods. The critical velocity (CV) test is used to quantify the relationship between total running distance and time to exhaustion (TTE), yielding aerobic (CV) and anaerobic parameters (anaerobic running capacity [ARC]). The purpose of this study was to examine the hypothesis that a preexercise supplement containing caffeine, creatine, and amino acids (Game Time; Corr-Jen Laboratories Inc, Aurora, CO) would positively impact CV and ARC in college-aged men and women. In a single-blind crossover design, 10 participants consumed the preexercise supplement (ACT) or placebo (PL) before each testing session. Each participant completed runs to exhaustion on a treadmill at 110%, 90% (day 1), and 105% and 100% (day 2) of the peak velocity (PV) determined from a graded exercise test. The ACT elicited a 10.8% higher ARC (P = .02) compared with the PL, whereas no difference was found in CV (0.6%, P = .38). The TTE was greater for the ACT than the PL at 110% (ACT = 125.7 ± 9.6 seconds, PL = 117.3 ± 12.6 seconds), 105% (ACT = 156.9 ± 11.0 seconds, PL = 143.8 ± 12.9 seconds), and 100% PV (ACT = 185.7 ± 10.7 seconds, PL = 169.7 ± 12.8 seconds) (P = .01-.04); but there was no difference for the TTE at 90% PV (ACT = 353.5 ± 52.7 seconds, PL = 332.7 ± 54.0 seconds) (P = .08). These findings suggest that the acute ingestion of this preexercise supplement may be an effective strategy for improving anaerobic performance, but appears to have no effect on aerobic power. |
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Authors:
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David H Fukuda; Abbie E Smith; Kristina L Kendall; Jeffrey R Stout |
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: Nutrition research (New York, N.Y.) Volume: 30 ISSN: 1879-0739 ISO Abbreviation: Nutr Res Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-10-11 Completed Date: 2011-01-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8303331 Medline TA: Nutr Res Country: United States |
Other Details:
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Languages: eng Pagination: 607-14 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Metabolic and Body Composition Laboratory, Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019, USA. david.fukuda@ou.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Amino Acids / pharmacology* Anaerobic Threshold / drug effects*, physiology Caffeine / pharmacology* Creatine / pharmacology* Cross-Over Studies Dietary Supplements* Drug Therapy, Combination Exercise / physiology* Exercise Test Female Humans Male Running / physiology* Single-Blind Method Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 57-00-1/Creatine; 58-08-2/Caffeine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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