Document Detail

Fatigue-induced changes in myoelectric signal characteristics and perceived exertion.
MedLine Citation:
PMID:  2736449     Owner:  NLM     Status:  MEDLINE    
Perceived exertion (RPE) has been used as a subjective indicator of exercise intensity for extremely light to supramaximal-level dynamic exercise. Little data exist on the relationship of RPE to physiological variables during sustained isometric exercise. Ten male subjects volunteered and participated in this investigation. Subjects were instructed to maintain a hand grip contraction of 50% of maximal effort until exhaustion. During this bout of exercise, electromyographic activity (EMG) and RPE values were recorded at 10 s intervals. The raw EMG signals were processed for frequency content (mean power frequency [MPF] and for signal amplitude (root mean squared [RMS]). RPE was recorded as a subjective value selected from a ten-point scale with ratio properties. Analysis of the data indicated that RPE was strongly correlated to both MPF: r2 = (-).922, and RMS: r2 = .729. These data imply that during sustained isometric exercise changes in perceived exertion are related closely to electromyographic activity of the contracting muscle.
S M Hasson; J H Williams; J F Signorile
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Canadian journal of sport sciences = Journal canadien des sciences du sport     Volume:  14     ISSN:  0833-1235     ISO Abbreviation:  Can J Sport Sci     Publication Date:  1989 Jun 
Date Detail:
Created Date:  1989-08-09     Completed Date:  1989-08-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8707670     Medline TA:  Can J Sport Sci     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  99-102     Citation Subset:  IM; S    
Department of Physical Therapy, University of Texas, Galveston.
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MeSH Terms
Fatigue / physiopathology*
Isometric Contraction
Muscles / physiology*
Physical Endurance
Physical Exertion*

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

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