Tri-dimensional and triphasic muscle organization of whole-body pointing movements

Neuroscience
Enrico ChiovettoT Pozzo

Abstract

Previous kinematic and kinetic studies revealed that, when accomplishing a whole-body pointing task beyond arm's length, a modular and flexible organization could represent a robust solution to control simultaneously target pointing and equilibrium maintenance. Here, we investigated the underlying mechanisms that produce such a coordinative kinematic structure. We monitored the activity of a large number of muscles spread throughout subjects' bodies while they performed pointing movements beyond arm's length, either with or without imposition of postural or pointing constraints. Analyses revealed that muscle signals lied on a tri-dimensional hyper-plane and were temporally organized according to a triphasic pattern (three components, each one exhibiting one single peak of activation and the peaks being consecutive in time). Such a functional muscle synergy was found to be robust across conditions. Also the activities of the separate groups of muscles acting at each body joint resulted tri-dimensional. In particular, those associated with the muscles of the lower-body joints (ankle, knee and hip) always presented the three sequences in all conditions. However, a slightly different organization was found for the muscle activities...Continue Reading

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Citations

Mar 1, 2012·Experimental Brain Research·Enrico ChiovettoThierry Pozzo
Nov 22, 2013·PloS One·Enrico Chiovetto, Martin A Giese
Oct 4, 2013·Journal of Neurophysiology·Ioannis DelisBastien Berret
Aug 10, 2019·American Journal of Alzheimer's Disease and Other Dementias·Jasemin TodriJosé Luis Martínez Gil
May 10, 2018·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·Matthieu CasteranElizabeth Thomas
May 28, 2020·Journal of Computational Neuroscience·Sedigheh Dehghani, Fariba Bahrami
Feb 28, 2021·Scientific Reports·Daniela Rosa GarcezBianca Callegari
Apr 9, 2021·Science Advances·Jeremie GaveauCharalambos Papaxanthis

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