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No effect of antioxidant supplementation on muscle performance and blood redox status adaptations to eccentric training.
MedLine Citation:
PMID:  21508092     Owner:  NLM     Status:  Publisher    
BACKGROUND: It was recently reported that antioxidant supplementation decreases training efficiency and prevents cellular adaptations to chronic exercise. OBJECTIVE: This study aimed to investigate the effects of vitamin C and vitamin E supplementation on muscle performance, blood and muscle redox status biomarkers, and hemolysis in trained and untrained men after acute and chronic exercise. A specific type of exercise was applied (eccentric) to produce long-lasting and extensive changes in redox status biomarkers and to examine more easily the potential effects of antioxidant supplementation. DESIGN: In a double-blinded fashion, men received either a daily oral supplement of vitamin C and vitamin E (n = 14) or placebo (n = 14) for 11 wk (started 4 wk before the pretraining exercise testing and continued until the posttraining exercise testing). After baseline testing, the subjects performed an eccentric exercise session 2 times/wk for 4 wk. Before and after the chronic eccentric exercise, the subjects underwent one session of acute eccentric exercise, physiologic measurements were performed, and blood samples and muscle biopsy samples (from 4 men) were collected. RESULTS: The results failed to support any effect of antioxidant supplementation. Eccentric exercise similarly modified muscle damage and performance, blood redox status biomarkers, and hemolysis in both the supplemented and nonsupplemented groups. This occurred despite the fact that eccentric exercise induced marked changes in muscle damage and performance and in redox status after exercise. CONCLUSION: The complete lack of any effect on the physiologic and biochemical outcome measures used raises questions about the validity of using oral antioxidant supplementation as a redox modulator of muscle and redox status in healthy humans.
Anastasios A Theodorou; Michalis G Nikolaidis; Vassilis Paschalis; Stilianos Koutsias; George Panayiotou; Ioannis G Fatouros; Yiannis Koutedakis; Athanasios Z Jamurtas
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-20
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  -     ISSN:  1938-3207     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Physical Education and Sport Science, University of Thessaly, Trikala, Greece.
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