The Effects of Selective Muscle Weakness on Muscle Coordination in the Human Arm
Joint Authors
Nader, Antoun
Roh, Jinsook
Beer, Randall F.
Lai, Andrew
Rho, Monica
Karvelas, Kristopher R.
Rymer, William Z.
Kendall, Mark C.
Source
Applied Bionics and Biomechanics
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-09-19
Country of Publication
Egypt
No. of Pages
16
Main Subjects
Abstract EN
Despite the fundamental importance of muscle coordination in daily life, it is currently unclear how muscle coordination adapts when the musculoskeletal system is perturbed.
In this study, we quantified the impact of selective muscle weakness on several metrics of muscle coordination.
Seven healthy subjects performed 2D and 3D isometric force target matches, while electromyographic (EMG) signals were recorded from 13 elbow and shoulder muscles.
Subsequently, muscle weakness was induced by a motor point block of brachialis muscle.
Postblock subjects repeated the force generation tasks.
We quantified muscle coordination pre- and postblock using three metrics: tuning curve preferred direction, tuning curve area, and motor modules analysis via nonnegative matrix factorization.
For most muscles, the tuning direction for the 2D protocol was not substantially altered postblock, while tuning areas changed more drastically.
Typically, five motor modules were identified from the 3D task, and four motor modules were identified in the 2D task; this result held across both pre- and postblock conditions.
The composition of one or two motor modules, ones that involved mainly the activation of shoulder muscles, was altered postblock.
Our results demonstrate that selective muscle weakness can induce nonintuitive alternations in muscle coordination in the mechanically redundant human arm.
American Psychological Association (APA)
Roh, Jinsook& Beer, Randall F.& Lai, Andrew& Rho, Monica& Karvelas, Kristopher R.& Nader, Antoun…[et al.]. 2018. The Effects of Selective Muscle Weakness on Muscle Coordination in the Human Arm. Applied Bionics and Biomechanics،Vol. 2018, no. 2018, pp.1-16.
https://search.emarefa.net/detail/BIM-1114676
Modern Language Association (MLA)
Roh, Jinsook…[et al.]. The Effects of Selective Muscle Weakness on Muscle Coordination in the Human Arm. Applied Bionics and Biomechanics No. 2018 (2018), pp.1-16.
https://search.emarefa.net/detail/BIM-1114676
American Medical Association (AMA)
Roh, Jinsook& Beer, Randall F.& Lai, Andrew& Rho, Monica& Karvelas, Kristopher R.& Nader, Antoun…[et al.]. The Effects of Selective Muscle Weakness on Muscle Coordination in the Human Arm. Applied Bionics and Biomechanics. 2018. Vol. 2018, no. 2018, pp.1-16.
https://search.emarefa.net/detail/BIM-1114676
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1114676