Document Detail


Surface EMG recordings during maximum static shoulder forward flexion in different positions.
MedLine Citation:
PMID:  3396555     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study investigated how position in the range of motion influences the power spectral density function during static shoulder forward flexion. 23 healthy females (20-30 years) volunteered as subjects. They performed maximum static shoulder forward flexions in three positions: 45, 65 and 90 degrees of shoulder flexion. An isokinetic dynamometer was used and the subjects were seated in a specially constructed chair to enable adequate fixation. The elbow was extended and the hand pronated. Electromyographic (EMG) signals (using surface electrodes) were obtained from the descending part of the right trapezius, the anterior portion of the right deltoid, the right infraspinatus and the common belly of the right biceps brachii. The four EMG-signals and the torque and shoulder angle were analyzed by computer. For each 256 ms, mean power frequency, root mean square value and mean torque were calculated. At each of the three positions four 256 ms periods were analyzed and the data are presented as their means. In the trapezius and the biceps brachii the mean power frequency did not change between the three positions. Deltoid and infraspinatus had significantly higher mean power frequencies at 90 degrees than at 45 degrees of flexion. Different factors behind the change in mean power frequency are discussed. The need to standardize the range of motion when studying dynamic fatiguing contractions is emphasised.
Authors:
B Gerdle; N E Eriksson; L Brundin; M Edström
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  57     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1988  
Date Detail:
Created Date:  1988-08-30     Completed Date:  1988-08-30     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  415-9     Citation Subset:  IM    
Affiliation:
National Institute of Occupational Health, Work Physiology Division, Umeå, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Adult
Electromyography / methods*
Female
Humans
Mathematics
Muscle Contraction*
Muscles / physiology*
Posture*
Shoulder / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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