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Motor unit number index examination in dominant and non-dominant hand muscles

Content Provider	Scilit
Author	Li, Xiaoyan He, Wensheng Li, Charles Wang, Ying-Chih Slavens, Brooke A. Zhou, Ping
Copyright Year	2015
Description	This study investigated the effect of handedness on motor unit number index (MUNIX). Maximal hand strength, compound muscle action potential (CMAP) and voluntary surface electromyography (EMG) signals were measured bilaterally for the first dorsal interosseous (FDI) and thenar muscles in 24 right-handed and 2 left-handed healthy subjects. Mean (±standard error) grip and pinch forces in the dominant hand were 43.99 ± 2.36 kg and 9.36 ± 0.52 kg respectively, significantly larger than those in the non-dominant hand (grip: 41.37 ± 2.29 kg, p < .001; pinch: 8.79 ± 0.46 kg, p < .01). Examination of myoelectric parameters did not show a significant difference among the CMAP area, the MUNIX or motor unit size index (MUSIX) between the two sides in the FDI and thenar muscles. In addition, there was a lack of correlation between the strength and myoelectric parameters in regression analysis. However, strong correlations were observed between dominant and non-dominant hand muscles in both strength and myoelectric measures. Our results indicate that the population of motor units or spinal motor neurons as estimated from MUNIX may not be associated with handedness. Such findings help understand and interpret the MUNIX during its application for clinical or laboratory investigations.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4549196/pdf
Ending Page	710
Page Count	12
Starting Page	699
ISSN	1357650X
e-ISSN	14640678
DOI	10.1080/1357650x.2015.1041971
Journal	Laterality
Issue Number	6
Volume Number	20
Language	English
Publisher	Informa UK Limited
Publisher Date	2015-11-02
Access Restriction	Open
Subject Keyword	Journal: Laterality Biological Psychology Compound Muscle Action Potential (cmap) Electromyography (emg) Hand Dominance Motor Unit Number Index (munix).
Content Type	Text
Resource Type	Article
Subject	Arts and Humanities Medicine Psychology

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