Document Detail

Comparison of different estimators of electromyographic spectral shifts during work when applied on short test contractions.
MedLine Citation:
PMID:  1817214     Owner:  NLM     Status:  MEDLINE    
EMG was recorded during short test contractions performed during occupational work. Mean power frequency (MPF) and median frequency (MF), calculated from EMG spectra, and zero crossing rate (ZC) of the EMG signal were compared as estimators of local muscular fatigue. The results show that there is a systematic difference between the three estimates. The difference can be explained by dividing the effect of muscle fatigue on EMG spectra into a motor unit action potential velocity effect and a firing statistics effect. Furthermore, it is shown that the phenomenon of increasing estimators of EMG spectrum shift is unlikely to be caused by motor unit action potential velocity increase. Successive recruitment of new motor units is suggested as a feasible explanation.
G M Hägg
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Medical & biological engineering & computing     Volume:  29     ISSN:  0140-0118     ISO Abbreviation:  Med Biol Eng Comput     Publication Date:  1991 Sep 
Date Detail:
Created Date:  1992-07-08     Completed Date:  1992-07-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7704869     Medline TA:  Med Biol Eng Comput     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  511-6     Citation Subset:  IM    
Division of Applied Work Physiology, National Institute of Occupational Health, Solna, Sweden.
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MeSH Terms
Muscle Contraction / physiology*
Signal Processing, Computer-Assisted
Work / physiology

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

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