Document Detail

Longitudinal variations of characteristic frequencies of skeletal muscle fibre potentials detected by a bipolar electrode or multi-electrode.
MedLine Citation:
PMID:  11345099     Owner:  NLM     Status:  MEDLINE    
We aimed to reveal reasons for longitudinal variations of characteristic frequencies of electromyographic signals detected by surface longitudinal multi-electrodes. Since the terminal phases were reduced in bipolar recordings, we tested whether the frequency variations reflected the effects of the excitation origin and extinction as in monopolar recordings. A precise and fast convolution method to calculate the signals detected by a multi electrode was suggested. The contribution of different electrode poles was introduced in the impulse response. When a longitudinal multi-electrode with an even number of poles was positioned above the end-plate of asymmetrical fibres, the signal mainly reflected the processes of the excitation extinction This increased the signal mean and median frequencies Although the effects of origin and extinction of the excitation were significantly reduced in the spatially filtered signals, the frequency variations along the fibre reflected these intrinsic features of any skeletal muscle fibre of finite length.
N A Dimitrova; G V Dinitrov; A Nikitin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of medical engineering & technology     Volume:  25     ISSN:  0309-1902     ISO Abbreviation:  J Med Eng Technol     Publication Date:    2001 Jan-Feb
Date Detail:
Created Date:  2001-05-09     Completed Date:  2001-10-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7702125     Medline TA:  J Med Eng Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  34-40     Citation Subset:  IM    
Centre of Biomedical Engineering, Bulgarian Academy of Sciences, Sofia.
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MeSH Terms
Electromyography / instrumentation*
Evoked Potentials / physiology
Muscle, Skeletal / physiology*

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

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