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No Effect of 1 or 7 Days Green Tea Extract Ingestion on Fat Oxidation during Exercise.
MedLine Citation:
PMID:  23247713     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: The aim of this study was to investigate the effects of 1 day and 7 days ingestion of a green tea extract (GTE) on whole body fat oxidation during moderate-intensity exercise. METHODS: Thirty one males completed two exercise trials (60 min cycle 50% Wmax). Following the baseline trial (Day 0) subjects were randomly assigned to one of three conditions involving a week supplementation of; 1) 7 days placebo (PLA); 2) 6 days of PLA followed by 1 day of GTE (GTE1); 3) 7 days of GTE ingestion (GTE7). The morning after the supplementation week, subjects consumed an additional supplement and completed a second exercise trial (Day 8). VO2 and VCO2 measurements were taken during exercise to calculate whole body fat oxidation rates. Blood samples, for analysis of plasma fatty acids (FAs), glycerol and epigallocatechin gallate (EGCG), were collected at rest and during exercise. RESULTS: On Day 8 the plasma kinetics and maximal plasma concentrations of EGCG were similar in the GTE1 and GTE7 group (206 ± 28 and 216 ± 25 ng·mL-1 respectively). One day of GTE ingestion did not affect markers of lipolysis during the exercise bout. Seven days of GTE ingestion significantly increased plasma glycerol during exercise (P=0.045) and plasma FAs during exercise (P=0.020) as well as at rest (P= 0.046). However, fat oxidation did not change in any of the groups. CONCLUSIONS: There was no effect of 1 day GTE ingestion on markers of lipolysis or fat oxidation during exercise. Seven days of GTE ingestion increased lipolysis, indicated by increased plasma FA and glycerol concentrations, but did not result in significant changes in fat oxidation.
Authors:
Rebecca K Randell; Adrian B Hodgson; Silvina B Lotito; Doris M Jacobs; Niels Boon; David J Mela; Asker E Jeukendrup
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-14
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom 2Unilever R&D-Colworth Science Park, Sharnbrook, Bedfordshire, United Kingdom 3Unilever R&D, Vlaardingen, The Netherlands.
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