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:  23212321     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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 muscle-endurance test consisting of 3 sets of 2 strength exercises (bench press, back squat) performed to exhaustion, with a load at 60% 1-repetition maximum and 1-min rests between sets. Blood samples were collected preexercise, 5 min after the muscle-endurance test, and after 24 hr of recovery. Blood plasma was analyzed 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 postexercise and remained elevated after a 24-hr recovery period. SOD activity in erythrocytes did not change significantly in response to the muscle-endurance test, whereas in both groups plasma CK activity increased significantly after 24 hr of recovery. Acute intake of GTP cased a 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.
Authors:
Ewa Jówko; Jaroslaw Sacharuk; Bozena Balasinska; Jacek Wilczak; Malgorzata Charmas; Piotr Ostaszewski; Robert Charmas
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  22     ISSN:  1543-2742     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  486-96     Citation Subset:  IM    
Affiliation:
Faculty of Physical Education and Sport in Biala Podlaska, University of Physical Education, Warsaw, Poland.
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