Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space

Abstract The movement in a joint is facilitated by a pair of muscles that pull in opposite directions. The difference in the pair’s muscle force or reciprocal activity results in joint torque, while the overlapping muscle force or the cocontraction is related to the joint’s stiffness. Cocontraction...

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Autores principales:	Atsushi Takagi, Hiroyuki Kambara, Yasuharu Koike
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e1f1510345df4781ba2ef145d442cfb0
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id	oai:doaj.org-article:e1f1510345df4781ba2ef145d442cfb0
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spelling	oai:doaj.org-article:e1f1510345df4781ba2ef145d442cfb02021-12-02T12:42:19ZIndependent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space10.1038/s41598-020-79526-12045-2322https://doaj.org/article/e1f1510345df4781ba2ef145d442cfb02020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79526-1https://doaj.org/toc/2045-2322Abstract The movement in a joint is facilitated by a pair of muscles that pull in opposite directions. The difference in the pair’s muscle force or reciprocal activity results in joint torque, while the overlapping muscle force or the cocontraction is related to the joint’s stiffness. Cocontraction knowingly adapts implicitly over a number of movements, but it is unclear whether the central nervous system can actively regulate cocontraction in a goal-directed manner in a short span of time. We developed a muscle interface where a cursor’s horizontal position was determined by the reciprocal activity of the shoulder flexion–extension muscle pair, while the vertical position was controlled by its cocontraction. Participants made goal-directed movements to single and via-point targets in the two-dimensional muscle space, learning to move the cursor along the shortest path. Simulations using an optimal control framework suggest that the reciprocal activity and the cocontraction may be controlled independently by the CNS, albeit at a rate orders of magnitude slower than the muscle’s maximal activation speed.Atsushi TakagiHiroyuki KambaraYasuharu KoikeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Atsushi Takagi Hiroyuki Kambara Yasuharu Koike Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
description	Abstract The movement in a joint is facilitated by a pair of muscles that pull in opposite directions. The difference in the pair’s muscle force or reciprocal activity results in joint torque, while the overlapping muscle force or the cocontraction is related to the joint’s stiffness. Cocontraction knowingly adapts implicitly over a number of movements, but it is unclear whether the central nervous system can actively regulate cocontraction in a goal-directed manner in a short span of time. We developed a muscle interface where a cursor’s horizontal position was determined by the reciprocal activity of the shoulder flexion–extension muscle pair, while the vertical position was controlled by its cocontraction. Participants made goal-directed movements to single and via-point targets in the two-dimensional muscle space, learning to move the cursor along the shortest path. Simulations using an optimal control framework suggest that the reciprocal activity and the cocontraction may be controlled independently by the CNS, albeit at a rate orders of magnitude slower than the muscle’s maximal activation speed.
format	article
author	Atsushi Takagi Hiroyuki Kambara Yasuharu Koike
author_facet	Atsushi Takagi Hiroyuki Kambara Yasuharu Koike
author_sort	Atsushi Takagi
title	Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
title_short	Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
title_full	Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
title_fullStr	Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
title_full_unstemmed	Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
title_sort	independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/e1f1510345df4781ba2ef145d442cfb0
work_keys_str_mv	AT atsushitakagi independentcontrolofcocontractionandreciprocalactivityduringgoaldirectedreachinginmusclespace AT hiroyukikambara independentcontrolofcocontractionandreciprocalactivityduringgoaldirectedreachinginmusclespace AT yasuharukoike independentcontrolofcocontractionandreciprocalactivityduringgoaldirectedreachinginmusclespace
_version_	1718393714330566656

Independent control of cocontraction and reciprocal activity during goal-directed reaching in muscle space

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