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Muscle passive stiffness increases less after the second bout of eccentric exercise compared to the first bout.
MedLine Citation:
PMID:  21414841     Owner:  NLM     Status:  Publisher    
Objectives: The purpose of this study was to assess if the protective adaptation after eccentric exercise affects changes in passive stiffness of the biceps brachii muscle. Design: A within-group repeated measures design was used to compare changes in passive muscle stiffness after eccentric exercise between the first and second bouts separated by 2-3 weeks. Method: Maximal isometric torque, passive muscle stiffness and soreness were measured on the right elbow flexors in 14 untrained male volunteers before, immediately after, 24, 48 and 120h following each bout of eccentric exercise that consisted of 30 repetitions of lowering a dumbbell adjusted to 75% of each individual's maximal isometric torque. Results: Maximal isometric torque reduced immediately after the first bout by 24±11% (mean±SD; P<0.05) and remained decreased for the next 120h (∼23%). Passive muscle stiffness immediately increased from 223±19N/m to 254±22N/m (P<0.05) and remained higher for 120h. After the second bout maximal isometric torque decreased 21±13%, and 48h later recovered to pre-exercise level (P<0.05). Increase in passive muscle stiffness was attenuated after the second bout (238±17N/m; P<0.05). The perceived muscle soreness was lower after the second bout. Conclusions: Smaller increases in passive muscle stiffness and soreness, and faster maximal isometric torque recovery after the second bout of eccentric exercise could result from adaptation process that occurred after the first bout.
Damian Janecki; Ewa Jarocka; Anna Jaskólska; Jarosław Marusiak; Artur Jaskólski
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-15
Journal Detail:
Title:  Journal of science and medicine in sport / Sports Medicine Australia     Volume:  -     ISSN:  1878-1861     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9812598     Medline TA:  J Sci Med Sport     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
Department of Kinesiology, University School of Physical Education, Poland.
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