Document Detail

Repeated Bout Effect is not Correlated With Intraindividual Variability During Muscle-Damaging Exercise.
MedLine Citation:
PMID:  20926966     Owner:  NLM     Status:  In-Data-Review    
Skurvydas, A, Brazaitis, M, and Kamandulis, S. Repeated bout effect is not correlated with intraindividual variability during muscle-damaging exercise. J Strength Cond Res 25(4): 1004-1009, 2011-The aim of this study was to test the hypothesis that the repeated bout effect depends on intraindividual variability during a second bout of eccentric exercise. Eleven healthy men performed 2 resistance training bouts consisting of maximal eccentric exercise (EE1 and EE2) using the knee extensor muscles. The interval between the exercise bouts was 2 weeks and consisted of 10 sets of 12 repetitions at 160°·s. Maximal isokinetic concentric torque at 30°·s was measured before the bouts and 2 minutes and 24 hours thereafter. Muscle soreness score and creatine kinase activity were determined before and after exercise. Intraindividual variability in torque during each eccentric repetition was measured during exercise. Repeated bout effect manifested after EE2: Muscle soreness was less, the shift in optimal knee joint angle to a longer muscle length was less, and the decrease in isokinetic concentric torque 2 minutes after exercise was less for EE2 compared with that for EE1. During concentric (isokinetic) contraction, length-dependent changes in isokinetic torque (IT) occurred after both EE1 and EE2: The shorter the muscle length, the greater the change in IT. There was a significant relationship between the decrease in maximal isokinetic knee extension torque 24 hours after EE1 and intraindividual variability of EE1 (R = 0.71, p < 0.05), but this relationship was not significant for EE2 (R = 0.18). It seems that intraindividual variability during eccentric exercise protects against muscle fatigue and damage during the first exercise bout but not during a repeat bout. These findings may be useful to coaches who wish to improve muscle function in resistance training with less depression in muscle function and discomfort of their athletes, specifically, when muscle is most sensitive to muscle-damaging exercise.
Albertas Skurvydas; Marius Brazaitis; Sigitas Kamandulis
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  25     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1004-9     Citation Subset:  IM    
Laboratory of Human Motorics, Department of Applied Physiology and Physiotherapy of the Lithuanian Academy of Physical Education, Kaunas, Lithuania.
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