Document Detail


No effects of three-week consumption of a green tea extract on time trial performance in endurance-trained men.
MedLine Citation:
PMID:  20533245     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to examine the effects of three-week consumption of green tea extract (GTE) supplementation on time trial performance and metabolism during cycling in endurance athletes. Nine endurance-trained men participated in this double-blind and placebo-controlled cross-over study. At the end of the supplementation period with GTE (159 mg/day total catechins) or placebo, respectively, subjects cycled at 50 % of the individual maximal power output for 2 hours, followed by a 30-minute time trial. Respiratory gas exchange, fatty acids, 3-beta-hydroxybutyrate, lactate, glucose, interleukin-6, thiobarbituric acid reactive substances, creatine kinase, and C-reactive protein (CRP) were measured 1 hour before, during, and 1 hour after the exercise test. Blood lipids were measured at rest before cycling. There was no significant effect on performance, energy metabolism, or any other measured parameter, except for CRP, which was significantly reduced (p = 0.045) after GTE supplementation compared to placebo. GTE supplementation did not affect time trial performance and energy metabolism in endurance-trained men in the non-fasting state. Further studies with athletes, particularly in the fed state, but with higher GTE doses, are needed to address the question whether green tea may influence energy metabolism and performance in athletes.
Authors:
Philipp Eichenberger; Samuel Mettler; Myrtha Arnold; Paolo C Colombani
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Publication Detail:
Type:  Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal for vitamin and nutrition research. Internationale Zeitschrift für Vitamin- und Ernährungsforschung. Journal international de vitaminologie et de nutrition     Volume:  80     ISSN:  0300-9831     ISO Abbreviation:  Int J Vitam Nutr Res     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-06-10     Completed Date:  2010-07-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1273304     Medline TA:  Int J Vitam Nutr Res     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  54-64     Citation Subset:  IM    
Affiliation:
Department of Biology, ETH Zurich, Zurich, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Athletic Performance / physiology*
Bicycling
C-Reactive Protein / analysis
Cross-Over Studies
Dietary Supplements*
Double-Blind Method
Energy Metabolism*
Exercise Test
Heart Rate
Humans
Inflammation Mediators / blood
Lipids / blood
Male
Oxygen Consumption
Physical Endurance / physiology*
Plant Extracts / administration & dosage*,  chemistry
Tea / chemistry*
Time Factors
Chemical
Reg. No./Substance:
0/Inflammation Mediators; 0/Lipids; 0/Plant Extracts; 0/Tea; 9007-41-4/C-Reactive Protein

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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