Document Detail


Post-match changes in neuromuscular function and the relationship to match demands in amateur rugby league matches.
MedLine Citation:
PMID:  22137196     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The current study investigated the change in neuromuscular contractile properties following competitive rugby league matches and the relationship with physical match demands. Eleven trained, male rugby league players participated in 2-3 amateur, competitive matches (n=30). Prior to, immediately (within 15min) and 2h post-match, players performed repeated counter-movement jumps (CMJ) followed by isometric tests on the right knee extensors for maximal voluntary contraction (MVC), voluntary activation (VA) and evoked twitch contractile properties of peak twitch force (Pt), rate of torque development (RTD), contraction duration (CD) and relaxation rate (RR). During each match, players wore 1Hz Global Positioning Satellite devices to record distance and speeds of matches. Further, matches were filmed and underwent notational analysis for number of total body collisions. Total, high-intensity, very-high intensity distances covered and mean speed were 5585±1078m, 661±265m, 216±121m and 75±14mmin(-1), respectively. MVC was significantly reduced immediately and 2h post-match by 8±11 and 12±13% from pre-match (p<0.05). Moreover, twitch contractile properties indicated a suppression of Pt, RTD and RR immediately post-match (p<0.05). However, VA was not significantly altered from pre-match (90±9%), immediately-post (89±9%) or 2h post (89±8%) (p>0.05). Correlation analyses indicated that total playing time (r=-0.50) and mean speed (r=-0.40) were moderately associated to the change in post-match MVC, while mean speed (r=0.35) was moderately associated to VA. The present study highlights the physical demands of competitive amateur rugby league result in interruption of peripheral contractile function, and post-match voluntary torque suppression may be associated with match playing time and mean speeds.
Authors:
Rob Duffield; Alistair Murphy; Alanna Snape; Geoffrey M Minett; Melissa Skein
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-1
Journal Detail:
Title:  Journal of science and medicine in sport / Sports Medicine Australia     Volume:  -     ISSN:  1878-1861     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-5     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.
Affiliation:
School of Human Movement Studies, Charles Sturt University, Australia.
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