Force Steadiness: From Motor Units to Voluntary Actions

Voluntary actions are controlled by the synaptic inputs that are shared by pools of spinal motor neurons. The slow common oscillations in the discharge times of motor units due to these synaptic inputs are strongly correlated with the fluctuations in force during submaximal isometric contractions (f...

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Bibliographic Details
Published inPhysiology (Bethesda, Md.) Vol. 36; no. 2; pp. 114 - 130
Main Authors Enoka, Roger M, Farina, Dario
Format Journal Article
LanguageEnglish
Published United States 01.03.2021
Subjects
motor function
spinal cord
high-density electromyography
common synaptic input
force control
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Summary:Voluntary actions are controlled by the synaptic inputs that are shared by pools of spinal motor neurons. The slow common oscillations in the discharge times of motor units due to these synaptic inputs are strongly correlated with the fluctuations in force during submaximal isometric contractions (force steadiness) and moderately associated with performance scores on some tests of motor function. However, there are key gaps in knowledge that limit the interpretation of differences in force steadiness.
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ISSN:1548-9213
1548-9221
DOI:10.1152/physiol.00027.2020