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ORIGINAL ARTICLE
Ann Clin Neurophysiol. 2018; 20(1): 26-30.
Published online January 31, 2018.
doi: https://doi.org/10.14253/acn.2018.20.1.26
Applicability of the digital instrument to improve the reproducibility of motor unit number index
Suk-Won Ahn 
Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
Corresponding Author: Suk-Won Ahn ,Tel: +82-2-6299-3153 , Fax: +82-2-6299-3153 , Email: icandr@hanmail.net
Received June 7, 2017   Revised: December 31, 2017    Accepted January 3, 2018
Copyright © 2018 The Korean Society of Clinical Neurophysiology
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
ABSTRACT
Background: The motor unit number index (MUNIX) and motor unit size index (MUSIX) refer to the electrophysiological measurement of the motor units using the surface electromyographic interference pattern (SIP) recorded during graded muscle contraction. In order to improve the reliability and reproducibility of MUNIX by the systematization of the graded muscle contractions, we applied a digital hand instrument to the procedure of recording SIP signals.
Methods: We tested the applicability of the digital instrument in the MUNIX technique by assessing the mean values and the reproducibility of the MUNIX involving the abductor pollicis brevis (APB) and the abductor digiti minimi (ADM) muscles in 30 healthy adults.
Results: The digital dynamometer was successfully applied to the MUNIX measurements of the APB and ADM muscles, and showed high reproducibility across trials.
Conclusions: Application of the digital instrument would be useful in improving the reliability and reproducibility of MUNIX.
Key words: Motor neurons; Motor neuron disease; Amyotrophic lateral sclerosis; Electromyography
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