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Effects of flexibility training on eccentric exercise-induced muscle damage.
MedLine Citation:
PMID:  20689450     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
PURPOSE: : This study investigated whether flexibility training would attenuate muscle damage induced by maximal eccentric exercise.
METHODS: : Thirty untrained young men were allocated to static stretching (SS), proprioceptive neuromuscular facilitation (PNF), or control group (n = 10 per group). The SS consisted of 30 sets of a 30-s standard SS with a 30-s rest between sets, and the PNF included 5 sets of the 30-s standard SS followed by 3 sets of three "contract-relax-agonist-contract" procedures. These were performed three times a week for 8 wk, and all subjects performed six sets of 10 maximal isokinetic (30°·s) lengthening contractions of the knee flexors after the 8-wk training or 8 wk after the baseline measures (control). Changes in indirect markers of muscle damage before and for 5 d after the eccentric exercise were compared among the groups.
RESULTS: : The range of motion (ROM) of the hip joint increased by 25°, and the optimum angle of the knee flexors shifted (P < 0.05) to a longer muscle length by 10° after training, without significant differences between SS and PNF. No significant changes in these variables were evident for the control group. Compared with the control group, the SS and PNF groups showed significantly (P < 0.05) smaller decreases and faster recovery of knee flexor muscle strength and smaller changes in optimum angle, ROM, muscle soreness, and plasma creatine kinase activity and myoglobin concentration without significant differences between the groups. The preeccentric exercise ROM or optimum angle was significantly (P < 0.05) correlated with the changes in the muscle damage markers.
CONCLUSIONS: : These results suggest that both SS and PNF training are effective in attenuating eccentric exercise-induced muscle damage and that flexible muscles are less susceptible to the damage.
Authors:
Che-Hsiu Chen; Kazunori Nosaka; Hsin-Lian Chen; Ming-Ju Lin; Kuo-Wei Tseng; Trevor C Chen
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  43     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  491-500     Citation Subset:  IM; S    
Affiliation:
1Department of Physical Education, National Chiayi University, Chiayi County, TAIWAN; 2School and Graduate Institute of Physical Therapy, National Taiwan University, Taipei City, TAIWAN; 3School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Western Australia, AUSTRALIA; 4Graduate Institute of Sport Coaching Science, Chinese Culture University, Taipei City, TAIWAN; and 5Department of Physical Education and Health, Taipei Physical Education College, Taipei City, TAIWAN.
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