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Neuromuscular Function following a Bout of Low-Load Blood Flow Restricted Exercise.
MedLine Citation:
PMID:  22895371     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: This study compared endurance and neuromuscular function after bouts of low-load (LL), high-load (HL) and low-load blood flow restricted (LLBFR) resistance exercise. METHODS: Eight recreationally active male subjects completed 3 sets of dynamic knee extensions to volitional failure under three conditions: HL (70% peak torque), LL (20% peak torque), and LLBFR (20% peak torque with an occlusive cuff inflated to 180 mmHg wrapped around the thigh). Before and immediately following exercise, isometric torque, central activation, electrically evoked torque and muscle activation via surface electromyography (EMG) were measured. RESULTS: Isometric torque and evoked torque decreased an average of 37% and 40%, respectively (P < 0.01) in all conditions following exercise. There were no differences in the toque decrements between the conditions (P>0.05). Percent central activation did not change after any condition (P = 0.09). Rate of torque development declined an average of 26% after all three conditions (P=0.003) and rate of half-relaxation time was depressed by 48% after the HL condition (P=0.004) only. EMG amplitude was greater in the HL condition at the beginning and end of exercise compared to the LL and LLBFR conditions (P=0.001). At the end of exercise, EMG amplitude rose 19% (P=0.02) and was not different among conditions (P>0.05). Subjects performed more repetitions during the LL and LLBFR conditions (P<0.05). CONCLUSION: Although LL and LLBFR resistance exercise to volitional failure exhibit lower levels of muscle activation than HL exercise, similar torque decrements occur after all bouts of resistance exercise and the muscle fatigue can be attributed to peripheral factors.
Authors:
Summer B Cook; Bethany G Murphy; Katherine E Labarbera
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-14
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
University of New Hampshire, Durham, NH.
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