Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity

Abstract Understanding the modulations of motor control in the presence of perturbations in task conditions of varying complexity is a key element towards the design of effective perturbation-based balance exercise programs. In this study we investigated the effect of mechanical perturbations, induc...

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Autores principales:	Lida Mademli, Dimitra Mavridi, Sebastian Bohm, Dimitrios A. Patikas, Alessandro Santuz, Adamantios Arampatzis
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4759a87a4ee24f1a9722083470845144
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spelling	oai:doaj.org-article:4759a87a4ee24f1a97220834708451442021-12-02T11:39:33ZStanding on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity10.1038/s41598-021-84899-y2045-2322https://doaj.org/article/4759a87a4ee24f1a97220834708451442021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84899-yhttps://doaj.org/toc/2045-2322Abstract Understanding the modulations of motor control in the presence of perturbations in task conditions of varying complexity is a key element towards the design of effective perturbation-based balance exercise programs. In this study we investigated the effect of mechanical perturbations, induced by an unstable surface, on muscle activation and visuo-postural coupling, when actively tracking target motion cues of different complexity. Four postural tasks following a visual oscillating target of varying target complexity (periodic-sinusoidal vs. chaotic-Lorenz) and surface (stable-floor vs. unstable-foam) were performed. The electromyographic activity of the main plantarflexor and dorsiflexor muscles was captured. The coupling between sway and target was assessed through spectral analysis and the system’s local dynamic stability through the short-term maximum Lyapunov exponent. We found that external perturbations increased local instability and deteriorated visuo-motor coupling. Visuo-motor deterioration was greater for the chaotic target, implying that the effect of the induced perturbations depends on target complexity. There was a modulation of the neuromotor system towards amplification of muscle activity and coactivation to compensate surface-related perturbations and to ensure robust motor control. Our findings provide evidence that, in the presence of perturbations, target complexity induces specific modulations in the neuromotor system while controlling balance and posture.Lida MademliDimitra MavridiSebastian BohmDimitrios A. PatikasAlessandro SantuzAdamantios ArampatzisNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lida Mademli Dimitra Mavridi Sebastian Bohm Dimitrios A. Patikas Alessandro Santuz Adamantios Arampatzis Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
description	Abstract Understanding the modulations of motor control in the presence of perturbations in task conditions of varying complexity is a key element towards the design of effective perturbation-based balance exercise programs. In this study we investigated the effect of mechanical perturbations, induced by an unstable surface, on muscle activation and visuo-postural coupling, when actively tracking target motion cues of different complexity. Four postural tasks following a visual oscillating target of varying target complexity (periodic-sinusoidal vs. chaotic-Lorenz) and surface (stable-floor vs. unstable-foam) were performed. The electromyographic activity of the main plantarflexor and dorsiflexor muscles was captured. The coupling between sway and target was assessed through spectral analysis and the system’s local dynamic stability through the short-term maximum Lyapunov exponent. We found that external perturbations increased local instability and deteriorated visuo-motor coupling. Visuo-motor deterioration was greater for the chaotic target, implying that the effect of the induced perturbations depends on target complexity. There was a modulation of the neuromotor system towards amplification of muscle activity and coactivation to compensate surface-related perturbations and to ensure robust motor control. Our findings provide evidence that, in the presence of perturbations, target complexity induces specific modulations in the neuromotor system while controlling balance and posture.
format	article
author	Lida Mademli Dimitra Mavridi Sebastian Bohm Dimitrios A. Patikas Alessandro Santuz Adamantios Arampatzis
author_facet	Lida Mademli Dimitra Mavridi Sebastian Bohm Dimitrios A. Patikas Alessandro Santuz Adamantios Arampatzis
author_sort	Lida Mademli
title	Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
title_short	Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
title_full	Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
title_fullStr	Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
title_full_unstemmed	Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
title_sort	standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4759a87a4ee24f1a9722083470845144
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Standing on unstable surface challenges postural control of tracking tasks and modulates neuromuscular adjustments specific to task complexity

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