TY - JOUR
T1 - Tonic and kinetic motor units revisited
T2 - Does motor unit firing behavior differentiate motor units?
AU - Masakado, Yoshihisa
AU - Akaboshi, Kazuto
AU - Kimura, Akio
AU - Chino, Naoichi
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2000
Y1 - 2000
N2 - Objective: We tried to differentiate motor unit into two distinct populations, tonic and kinetic, on the basis of the relationship between the mean inter-spike interval and its variability. Methods: During voluntary isometric contraction myoelectric activity was recorded with a special quadrifilar electrode from first dorsal interosseous, biceps brachii, soleus, and tibialis anterior muscle. Motor unit action potentials (MUAP) were decomposed into individual MUAP trains, by electromyography (EMG) signal decomposition. The variability in the instantaneous firing rate was assessed at two or more levels of contraction in each muscle. Results: We found each muscle tested had a homogeneous population. There were no tonic and kinetic motor units. But there were differences in the variability in the instantaneous firing rate in the 4 muscles tested. Conclusion: Motor unit firing behavior in a muscle may be fitted for its function. Copyright (C) 2000 Elsevier Science Ireland Ltd.
AB - Objective: We tried to differentiate motor unit into two distinct populations, tonic and kinetic, on the basis of the relationship between the mean inter-spike interval and its variability. Methods: During voluntary isometric contraction myoelectric activity was recorded with a special quadrifilar electrode from first dorsal interosseous, biceps brachii, soleus, and tibialis anterior muscle. Motor unit action potentials (MUAP) were decomposed into individual MUAP trains, by electromyography (EMG) signal decomposition. The variability in the instantaneous firing rate was assessed at two or more levels of contraction in each muscle. Results: We found each muscle tested had a homogeneous population. There were no tonic and kinetic motor units. But there were differences in the variability in the instantaneous firing rate in the 4 muscles tested. Conclusion: Motor unit firing behavior in a muscle may be fitted for its function. Copyright (C) 2000 Elsevier Science Ireland Ltd.
KW - Decomposition technique
KW - Kinetic
KW - Mean inter-spike interval
KW - Motor unit
KW - Tonic
KW - Variability
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U2 - 10.1016/S1388-2457(00)00450-8
DO - 10.1016/S1388-2457(00)00450-8
M3 - Article
C2 - 11090772
AN - SCOPUS:0033768160
SN - 1388-2457
VL - 111
SP - 2196
EP - 2199
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
IS - 12
ER -