Document Detail

Mechanomyography and electromyography during and after fatiguing shoulder eccentric contractions in males and females.
MedLine Citation:
PMID:  17394479     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to investigate changes in mechanomyographic (MMG) and the surface electromyographic (EMG) signals during and after fatiguing shoulder eccentric contractions in a group consisting of 12 males and 12 females. Exerted force, MMG, EMG, pain and rate of perceived exertion were assessed before, during and after repeated high-intensity eccentric exercises. Bouts of eccentric contractions caused a decrease in the exerted force for males (P<0.05) and an increase in the rate of perceived exertion and pain for both genders (P<0.05). During eccentric exercise, the root mean square (RMS) values of the MMG signal increased (P<0.05). The mean power frequency (MPF) values of the EMG signal decreased at the end of each eccentric bout for both genders (P<0.05); the decrease was higher for females compared with males (P<0.05). Immediately after eccentric exercise in static abduction of the upper limbs, the MMG RMS and MPF values increased (P<0.05). The present study showed that (1) neuromuscular changes associated with pain and changes in muscle stiffness and (2) changes in motor units strategy during fatigue development in shoulder muscle are reflected in the MMG and EMG signals.
A Kawczyński; H Nie; A Jaskólska; A Jaskólski; L Arendt-Nielsen; P Madeleine
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Scandinavian journal of medicine & science in sports     Volume:  17     ISSN:  0905-7188     ISO Abbreviation:  Scand J Med Sci Sports     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-30     Completed Date:  2007-05-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  172-9     Citation Subset:  IM    
Department of Kinesiology, University School of Physical Education, Wroclaw, Poland.
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MeSH Terms
Analysis of Variance
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Pain Measurement
Physical Exertion / physiology*
Shoulder / physiology*

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