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Oligomerized lychee fruit extract (OLFE) and a mixture of vitamin C and vitamin E for endurance capacity in a double blind randomized controlled trial.
MedLine Citation:
PMID:  22448090     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Antioxidant supplementations are commonly used as an ergogenic aid for physical exercise despite its limited evidence. The study aimed to investigate the effects of a polyphenol mixture and vitamins on exercise endurance capacity. Seventy regularly exercising male participants were randomly assigned to receive oligomerized lychee fruit extract, a mixture of vitamin C (800 mg) and E (320 IU), or a placebo for 30 consecutive days. The study results showed that oligomerized lychee fruit extract significantly elevated the submaximal running time (p = 0.01). The adjusted mean change was 3.87 min (95% CI: 1.29, 6.46) for oligomerized lychee fruit extract, 1.33 (-1.23, 3.89) for the vitamins, and 1.60 (-1.36, 4.56) for the placebo (p = 0.33 in between groups). Oligomerized lychee fruit extract significantly increased the anaerobic threshold by 7.4% (1.8, 13.0). On the other hand, vitamins significantly attenuated VO(2)max by -3.11 ml/kg/m (-5.35, -0.87). Their effects on plasma free radical amount, however, were similar. Our results suggest that a polyphenol-containing supplement and typical antioxidants may have different mechanisms of action and that the endurance-promoting effect of oligomerized lychee fruit extract may not directly come from the scavenging of free radicals but may be attributed to other non-antioxidant properties of polyphenols, which requires further investigation.
Authors:
Seung Wan Kang; Seokyung Hahn; Jung-Kyu Kim; Seung-Min Yang; Byung-Joo Park; Sang Chul Lee
Publication Detail:
Type:  Journal Article     Date:  2011-10-18
Journal Detail:
Title:  Journal of clinical biochemistry and nutrition     Volume:  50     ISSN:  1880-5086     ISO Abbreviation:  J Clin Biochem Nutr     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-03-26     Completed Date:  2012-08-23     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  8700907     Medline TA:  J Clin Biochem Nutr     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  106-13     Citation Subset:  -    
Affiliation:
Institute of Complementary and Integrative Medicine, Medical Research Center, Seoul National University.
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