Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle

Abstract The extensor digitorum communis (EDC) is a multi-compartment muscle that allows dexterous extension of the four digits. However, the level of common input shared across different compartments of this muscle is not well understood. We seek to systematically characterize the common and indepe...

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Main Authors:	Chenyun Dai, Henry Shin, Bradley Davis, Xiaogang Hu
Format:	Article
Language:	English
Published:	Nature Publishing Group 2017-10-01
Series:	Scientific Reports
Online Access:	https://doi.org/10.1038/s41598-017-14555-x

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spelling	doaj-d5959712e1034d34883b63b13257beb42020-12-08T01:35:12ZengNature Publishing GroupScientific Reports2045-23222017-10-017111110.1038/s41598-017-14555-xOrigins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis MuscleChenyun Dai0Henry Shin1Bradley Davis2Xiaogang Hu3Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State UniversityJoint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State UniversityJoint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State UniversityJoint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State UniversityAbstract The extensor digitorum communis (EDC) is a multi-compartment muscle that allows dexterous extension of the four digits. However, the level of common input shared across different compartments of this muscle is not well understood. We seek to systematically characterize the common and independent neural input, originated from different levels of the central nervous system, to the different compartments. A motor unit (MU) coherence analysis was used to capture the different sources of common and independent input, by quantifying the coherence of MU discharge between different compartments. The MU activities were obtained from decomposition of surface electromyogram recordings. Our results showed that the MU coherence across different muscle compartments accounted for only a small proportion (<20%) of the total input in the alpha (5–12 Hz) and beta (15–30 Hz) bands, but was a major driver (>60%) in the delta (1–4 Hz) band. Additionally, cross-compartment coherence between the middle and ring-little fingers tended to be higher as compared with other finger combinations. Overall, the common input shared across different fingers are found to be at low to moderate levels, in comparison with the total input, which allows dexterous control of individual digits with some degree of coordinated control of multiple digits.https://doi.org/10.1038/s41598-017-14555-x
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Chenyun Dai Henry Shin Bradley Davis Xiaogang Hu
spellingShingle	Chenyun Dai Henry Shin Bradley Davis Xiaogang Hu Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle Scientific Reports
author_facet	Chenyun Dai Henry Shin Bradley Davis Xiaogang Hu
author_sort	Chenyun Dai
title	Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle
title_short	Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle
title_full	Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle
title_fullStr	Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle
title_full_unstemmed	Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle
title_sort	origins of common neural inputs to different compartments of the extensor digitorum communis muscle
publisher	Nature Publishing Group
series	Scientific Reports
issn	2045-2322
publishDate	2017-10-01
description	Abstract The extensor digitorum communis (EDC) is a multi-compartment muscle that allows dexterous extension of the four digits. However, the level of common input shared across different compartments of this muscle is not well understood. We seek to systematically characterize the common and independent neural input, originated from different levels of the central nervous system, to the different compartments. A motor unit (MU) coherence analysis was used to capture the different sources of common and independent input, by quantifying the coherence of MU discharge between different compartments. The MU activities were obtained from decomposition of surface electromyogram recordings. Our results showed that the MU coherence across different muscle compartments accounted for only a small proportion (<20%) of the total input in the alpha (5–12 Hz) and beta (15–30 Hz) bands, but was a major driver (>60%) in the delta (1–4 Hz) band. Additionally, cross-compartment coherence between the middle and ring-little fingers tended to be higher as compared with other finger combinations. Overall, the common input shared across different fingers are found to be at low to moderate levels, in comparison with the total input, which allows dexterous control of individual digits with some degree of coordinated control of multiple digits.
url	https://doi.org/10.1038/s41598-017-14555-x
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Origins of Common Neural Inputs to Different Compartments of the Extensor Digitorum Communis Muscle

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