The reserve of joint torque determines movement coordination

Abstract Humans coordinate biomechanical degrees of freedom to perform tasks at minimum cost. When reaching a target from a seated position, the trunk-arm-forearm coordination moves the hand to the well-defined spatial goal, while typically minimising hand jerk and trunk motion. However, due to fati...

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Autores principales:	Germain Faity, Denis Mottet, Simon Pla, Jérôme Froger
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8fe9e49bb9f14558af8ac829a478f2a7
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spelling	oai:doaj.org-article:8fe9e49bb9f14558af8ac829a478f2a72021-11-28T12:17:31ZThe reserve of joint torque determines movement coordination10.1038/s41598-021-02338-42045-2322https://doaj.org/article/8fe9e49bb9f14558af8ac829a478f2a72021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02338-4https://doaj.org/toc/2045-2322Abstract Humans coordinate biomechanical degrees of freedom to perform tasks at minimum cost. When reaching a target from a seated position, the trunk-arm-forearm coordination moves the hand to the well-defined spatial goal, while typically minimising hand jerk and trunk motion. However, due to fatigue or stroke, people visibly move the trunk more, and it is unclear what cost can account for this. Here we show that people recruit their trunk when the torque at the shoulder is too close to the maximum. We asked 26 healthy participants to reach a target while seated and we found that the trunk contribution to hand displacement increases from 11 to 27% when an additional load is handled. By flexing and rotating the trunk, participants spontaneously increase the reserve of anti-gravitational torque at the shoulder from 25 to 40% of maximal voluntary torque. Our findings provide hints on how to include the reserve of torque in the cost function of optimal control models of human coordination in healthy fatigued persons or in stroke victims.Germain FaityDenis MottetSimon PlaJérôme FrogerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Germain Faity Denis Mottet Simon Pla Jérôme Froger The reserve of joint torque determines movement coordination
description	Abstract Humans coordinate biomechanical degrees of freedom to perform tasks at minimum cost. When reaching a target from a seated position, the trunk-arm-forearm coordination moves the hand to the well-defined spatial goal, while typically minimising hand jerk and trunk motion. However, due to fatigue or stroke, people visibly move the trunk more, and it is unclear what cost can account for this. Here we show that people recruit their trunk when the torque at the shoulder is too close to the maximum. We asked 26 healthy participants to reach a target while seated and we found that the trunk contribution to hand displacement increases from 11 to 27% when an additional load is handled. By flexing and rotating the trunk, participants spontaneously increase the reserve of anti-gravitational torque at the shoulder from 25 to 40% of maximal voluntary torque. Our findings provide hints on how to include the reserve of torque in the cost function of optimal control models of human coordination in healthy fatigued persons or in stroke victims.
format	article
author	Germain Faity Denis Mottet Simon Pla Jérôme Froger
author_facet	Germain Faity Denis Mottet Simon Pla Jérôme Froger
author_sort	Germain Faity
title	The reserve of joint torque determines movement coordination
title_short	The reserve of joint torque determines movement coordination
title_full	The reserve of joint torque determines movement coordination
title_fullStr	The reserve of joint torque determines movement coordination
title_full_unstemmed	The reserve of joint torque determines movement coordination
title_sort	reserve of joint torque determines movement coordination
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8fe9e49bb9f14558af8ac829a478f2a7
work_keys_str_mv	AT germainfaity thereserveofjointtorquedeterminesmovementcoordination AT denismottet thereserveofjointtorquedeterminesmovementcoordination AT simonpla thereserveofjointtorquedeterminesmovementcoordination AT jeromefroger thereserveofjointtorquedeterminesmovementcoordination AT germainfaity reserveofjointtorquedeterminesmovementcoordination AT denismottet reserveofjointtorquedeterminesmovementcoordination AT simonpla reserveofjointtorquedeterminesmovementcoordination AT jeromefroger reserveofjointtorquedeterminesmovementcoordination
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The reserve of joint torque determines movement coordination

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