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N-Acetylcysteine Attenuates Fatigue Following Repeated-Bouts of Intermittent Exercise: Practical Implications for Tournament Situations.
MedLine Citation:
PMID:  21896942     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Production of reactive oxygen species (ROS) during contractions is associated with muscular fatigue and damage in the short-term and adaptive responses in the long-term. When adaptation is inconsequential acute antioxidant supplementation may be able to attenuate muscle fatigue and damage to enhance performance. This study aimed to determine the effects of acute oral N-acetylcysteine (NAC) supplementation on Yo-Yo intermittent recovery test performance level one (YIRT-L1) following repeated-bouts of damaging intermittent exercise. In a pair-matched design, twelve recreationally-trained males engaged in either six days of NAC (n = 6) or placebo (n = 6) supplementation. Following a treatment loading day, participants completed three testing sessions, on alternate days, consisting of a pre-exercise Isokinetic dynamometry (IKD) test, a damaging intermittent exercise protocol, YIRT-L1 and a post-exercise IKD. A further IKD test was completed on the two intervening days. NAC treatment resulted in a significant preservation of YIRT-L1 performance (P≤0.0005). IKD performance significantly deteriorated over time at all contractions speeds and this deterioration was not influenced by treatment group. Plasma creatine kinase values increased significantly over time (P=.002) and were significantly greater in the NAC group compared with the placebo group (P=.029). NAC induced mild-gastrointenstinal side effects. NAC supplementation may be a useful strategy to enhance performance during short-term competitive situations where adaption is inconsequential. Titration studies to elucidate a treatment dose that enhances performance without inducing side-effects are now required.
Authors:
J N Cobley; C McGlory; J P Morton; Graeme L Close
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-29
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-9-7     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:  -    
Affiliation:
School of Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK.
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