Document Detail

A noninvasive EMG technique for investigating the excitation propagation in single motor units.
MedLine Citation:
PMID:  2766991     Owner:  NLM     Status:  MEDLINE    
A new EMG recording technique which is based on a spatially filtering surface multi-electrode array enables, with its high spatial resolution, the noninvasive investigation of single motor unit (MU) excitations. This recording technique was applied to study the propagation velocity within single, superficial MUs of lower arm muscles. The conduction velocity (CV) was estimated by time shifts between action potentials (APs) recorded at different positions along the muscle fibres. Several signal characteristics to define this time shift were compared in regard of their influence on the reliability of CV values. Best results were obtained by calculating the time shift between main peak maxima, with a standard deviation found for the CV values from single APs in the range of 4 to 25%. The disturbance by signal noise could be reduced by the application of approximating cubic spline functions. The CV values showed a remarkable variability between different sites along the single MU muscle fibres.
J Schneider; G Rau; J Silny
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Electromyography and clinical neurophysiology     Volume:  29     ISSN:  0301-150X     ISO Abbreviation:  Electromyogr Clin Neurophysiol     Publication Date:    1989 Jul-Aug
Date Detail:
Created Date:  1989-10-11     Completed Date:  1989-10-11     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0327533     Medline TA:  Electromyogr Clin Neurophysiol     Country:  BELGIUM    
Other Details:
Languages:  eng     Pagination:  273-80     Citation Subset:  IM    
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MeSH Terms
Action Potentials
Muscles / innervation*,  physiology

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