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1.
Muscle Nerve ; 61(2): E13, 2020 02.
Article in English | MEDLINE | ID: mdl-31725907
2.
Muscle Nerve ; 60(1): 25-31, 2019 07.
Article in English | MEDLINE | ID: mdl-30847939

ABSTRACT

INTRODUCTION: This study was performed to evaluate the effect of prior voluntary activation of a muscle on the subsequently-recorded compound muscle action potential (CMAP). METHODS: The CMAPs from the hypothenar, thenar, and extensor digitorum brevis muscles were recorded in 6 healthy volunteers at rest and for up to 30 min following 5 separate epochs of up to 20 s of voluntary muscle activation. RESULTS: There was consistent, significant (P < 0.02) enhancement of the negative area, amplitude, and duration of the CMAP after activation. The enhancement was maximal, up to 144% of baseline, within about 1 min post-activation; thereafter, the CMAP gradually returned to baseline over about 15 min. DISCUSSION: Activation of a muscle within several minutes prior to testing enhances the subsequently-recorded CMAP. This observation highlights prior muscle activation as a physiological variable that influences the size of the CMAP during motor nerve conduction studies. Muscle Nerve, 2019.


Subject(s)
Action Potentials/physiology , Median Nerve/physiology , Muscle Contraction/physiology , Muscle, Skeletal/physiology , Neural Conduction/physiology , Peroneal Nerve/physiology , Ulnar Nerve/physiology , Adult , Female , Healthy Volunteers , Humans , Male , Muscle, Skeletal/innervation , Young Adult
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