Document Detail

Effect of a Single Dose of Green Tea Polyphenols on the Blood Markers of Exercise-Induced Oxidative Stress in Soccer Players.
MedLine Citation:
PMID:  22805286     Owner:  NLM     Status:  Publisher    
PURPOSE: To evaluate the effect of acute ingestion of green tea polyphenols (GTP) on blood markers of oxidative stress and muscle damage in soccer players exposed to intense exercise. METHODS: This randomized, double-blinded study was conducted on 16 players during a general preparation period, when all athletes participated in a strength-training program focused on the development of strength endurance. After ingestion of a single dose of GTP (640 mg) or placebo, all athletes performed an intense muscular endurance test, consisting of three sets of two strength exercises (bench press, back squat) performed to exhaustion, with a load at 60% 1-RM (one repetition maximum) and a 1-minute rest between sets. Blood samples were collected pre-exercise, 5 minutes after the muscular endurance test (post-exercise) and after 24 hours of recovery. Blood plasma was determined for: the concentrations of thiobarbituric acid-reacting substances (TBARS), uric acid (UA), total catechins, total antioxidant status (TAS) and activity of creatine kinase (CK); at the same time erythrocytes were assayed for the activity of superoxide dismutase (SOD). RESULTS: In both groups, plasma TBARS, UA and TAS increased significantly post-exercise and remained elevated after a 24-hour recovery period. SOD activity in erythrocytes did not change significantly in response to the muscular endurance test, whereas in both groups plasma CK activity increased significantly after 24 hours of recovery. Acute intake of GTP cased slight, but significant increase in total plasma catechins. However, GTP was found not to exert a significant effect on measured parameters. CONCLUSIONS: Acute ingestion of GTP (640 mg) does not attenuate exercise-induced oxidative stress and muscle damage.
Ewa Jówko; Jaroslaw Sacharuk; Bozena Balasinska; Jacek Wilczak; Malgorzata Charmas; Piotr Ostaszewski; Robert Charmas
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-4
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Biochemistry, Faculty of Physical Education and Sport in Biala Podlaska, University of Physical Education in Warsaw, Poland.
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