Document Detail

Mechanical properties and behaviour of motor units in the tibialis anterior during voluntary contractions.
MedLine Citation:
PMID:  9415831     Owner:  NLM     Status:  MEDLINE    
The present work was carried out to analyse the properties and behaviour of Tibialis anterior motor units (MUs) during voluntary contractions in humans. A total of 528 single MU mechanical properties was recorded in 10 subjects by means of the spike-triggered averaging (STA) technique. MU recruitment thresholds and discharge frequencies were recorded during linearly increasing maximal voluntary contraction (MVC). The results indicate a mean (+/- SD) MU torque of 25.5 +/- 21.5 mN.m. and a mean time-to-peak of 45.6 +/- 13.6 ms. A comparison of the average MU twitch torque with that of the muscle allowed an estimate of about 300 MUs in the Tibialis anterior. A positive linear relationship was recorded between the MU twitch torque and the recruitment threshold. The mean minimal and maximal discharge frequencies of MUs were 8.4 +/- 3.0 Hz and 33.2 +/- 14.7 Hz, respectively. The results of the present work indicate that MU behaviour during voluntary contractions is different in the tibialis anterior and in the adductor pollicis.
M Van Cutsem; P Feiereisen; J Duchateau; K Hainaut
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of applied physiology = Revue canadienne de physiologie appliquée     Volume:  22     ISSN:  1066-7814     ISO Abbreviation:  Can J Appl Physiol     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-02-02     Completed Date:  1998-02-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9306274     Medline TA:  Can J Appl Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  585-97     Citation Subset:  IM    
Laboratory of Biology, Université Libre de Bruxelles, Belgium.
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MeSH Terms
Electric Stimulation
Motor Neurons / physiology*
Muscle Contraction / physiology*
Muscle, Skeletal / innervation*

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