Document Detail


A light load eccentric exercise confers protection against a subsequent bout of more demanding eccentric exercise.
MedLine Citation:
PMID:  17707693     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study investigated the hypothesis that a light eccentric exercise (ECC) that does not induce a loss of muscle function and delayed onset muscle soreness would confer a protective effect against a more strenuous ECC. Eighteen young men were randomly placed into two groups: 10-40% (n=9) and 40% (n=9). Subjects in the 10-40% group performed ECC of the elbow flexors (six sets of five reps) using a dumbbell set at 10% of maximal isometric strength (MVC) at an elbow joint angle of 90 degrees , followed 2 days later by ECC using a dumbbell weight of 40% MVC. Subjects in the 40% group performed the 40% ECC only. Changes in MVC, range of motion (ROM), upper arm circumference (CIR), plasma creatine kinase (CK) activity and muscle soreness before, immediately after, 1-5 and 7 days following the 40% ECC were compared between groups by a two-way repeated measures ANOVA. No significant changes in any of the criterion measures were found immediately and 1-2 days after the 10% ECC. Following the 40% ECC, the 10-40% group showed significantly (P<0.05) smaller decreases in MVC and ROM, and smaller increases in muscle soreness compared with the 40% group, but no significant differences between groups were evident for CIR and plasma CK activity. These results suggest that the 10% ECC induced some protection against a subsequent bout of 40% ECC performed 2 days later. It appears that the light eccentric exercise preconditioned the muscles for exposure to the subsequent damaging eccentric exercise bout.
Authors:
Andrew P Lavender; Kazunori Nosaka
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Publication Detail:
Type:  Journal Article     Date:  2007-08-17
Journal Detail:
Title:  Journal of science and medicine in sport / Sports Medicine Australia     Volume:  11     ISSN:  1440-2440     ISO Abbreviation:  J Sci Med Sport     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-04-28     Completed Date:  2008-10-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9812598     Medline TA:  J Sci Med Sport     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  291-8     Citation Subset:  IM    
Affiliation:
Graduate School of Integrated Science, Yokohama City University, Yokohama, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Athletic Injuries / physiopathology,  prevention & control*
Exercise / physiology
Humans
Male
Muscle, Skeletal / injuries*,  physiopathology
Physical Education and Training / methods*
Physical Endurance / physiology*
Upper Extremity / injuries,  physiology
Weight Lifting / physiology*

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