Locomotor-like leg movements evoked by rhythmic arm movements in humans.

Motion of the upper limbs is often coupled to that of the lower limbs in human bipedal locomotion. It is unclear, however, whether the functional coupling between upper and lower limbs is bi-directional, i.e. whether arm movements can affect the lumbosacral locomotor circuitry. Here we tested the ef...

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Autores principales:	Francesca Sylos-Labini, Yuri P Ivanenko, Michael J Maclellan, Germana Cappellini, Richard E Poppele, Francesco Lacquaniti
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/659cfb92342d4df49df99e2ee584a9fe
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id	oai:doaj.org-article:659cfb92342d4df49df99e2ee584a9fe
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spelling	oai:doaj.org-article:659cfb92342d4df49df99e2ee584a9fe2021-11-18T08:29:13ZLocomotor-like leg movements evoked by rhythmic arm movements in humans.1932-620310.1371/journal.pone.0090775https://doaj.org/article/659cfb92342d4df49df99e2ee584a9fe2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24608249/?tool=EBIhttps://doaj.org/toc/1932-6203Motion of the upper limbs is often coupled to that of the lower limbs in human bipedal locomotion. It is unclear, however, whether the functional coupling between upper and lower limbs is bi-directional, i.e. whether arm movements can affect the lumbosacral locomotor circuitry. Here we tested the effects of voluntary rhythmic arm movements on the lower limbs. Participants lay horizontally on their side with each leg suspended in an unloading exoskeleton. They moved their arms on an overhead treadmill as if they walked on their hands. Hand-walking in the antero-posterior direction resulted in significant locomotor-like movements of the legs in 58% of the participants. We further investigated quantitatively the responses in a subset of the responsive subjects. We found that the electromyographic (EMG) activity of proximal leg muscles was modulated over each cycle with a timing similar to that of normal locomotion. The frequency of kinematic and EMG oscillations in the legs typically differed from that of arm oscillations. The effect of hand-walking was direction specific since medio-lateral arm movements did not evoke appreciably leg air-stepping. Using externally imposed trunk movements and biomechanical modelling, we ruled out that the leg movements associated with hand-walking were mainly due to the mechanical transmission of trunk oscillations. EMG activity in hamstring muscles associated with hand-walking often continued when the leg movements were transiently blocked by the experimenter or following the termination of arm movements. The present results reinforce the idea that there exists a functional neural coupling between arm and legs.Francesca Sylos-LabiniYuri P IvanenkoMichael J MaclellanGermana CappelliniRichard E PoppeleFrancesco LacquanitiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 3, p e90775 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Francesca Sylos-Labini Yuri P Ivanenko Michael J Maclellan Germana Cappellini Richard E Poppele Francesco Lacquaniti Locomotor-like leg movements evoked by rhythmic arm movements in humans.
description	Motion of the upper limbs is often coupled to that of the lower limbs in human bipedal locomotion. It is unclear, however, whether the functional coupling between upper and lower limbs is bi-directional, i.e. whether arm movements can affect the lumbosacral locomotor circuitry. Here we tested the effects of voluntary rhythmic arm movements on the lower limbs. Participants lay horizontally on their side with each leg suspended in an unloading exoskeleton. They moved their arms on an overhead treadmill as if they walked on their hands. Hand-walking in the antero-posterior direction resulted in significant locomotor-like movements of the legs in 58% of the participants. We further investigated quantitatively the responses in a subset of the responsive subjects. We found that the electromyographic (EMG) activity of proximal leg muscles was modulated over each cycle with a timing similar to that of normal locomotion. The frequency of kinematic and EMG oscillations in the legs typically differed from that of arm oscillations. The effect of hand-walking was direction specific since medio-lateral arm movements did not evoke appreciably leg air-stepping. Using externally imposed trunk movements and biomechanical modelling, we ruled out that the leg movements associated with hand-walking were mainly due to the mechanical transmission of trunk oscillations. EMG activity in hamstring muscles associated with hand-walking often continued when the leg movements were transiently blocked by the experimenter or following the termination of arm movements. The present results reinforce the idea that there exists a functional neural coupling between arm and legs.
format	article
author	Francesca Sylos-Labini Yuri P Ivanenko Michael J Maclellan Germana Cappellini Richard E Poppele Francesco Lacquaniti
author_facet	Francesca Sylos-Labini Yuri P Ivanenko Michael J Maclellan Germana Cappellini Richard E Poppele Francesco Lacquaniti
author_sort	Francesca Sylos-Labini
title	Locomotor-like leg movements evoked by rhythmic arm movements in humans.
title_short	Locomotor-like leg movements evoked by rhythmic arm movements in humans.
title_full	Locomotor-like leg movements evoked by rhythmic arm movements in humans.
title_fullStr	Locomotor-like leg movements evoked by rhythmic arm movements in humans.
title_full_unstemmed	Locomotor-like leg movements evoked by rhythmic arm movements in humans.
title_sort	locomotor-like leg movements evoked by rhythmic arm movements in humans.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/659cfb92342d4df49df99e2ee584a9fe
work_keys_str_mv	AT francescasyloslabini locomotorlikelegmovementsevokedbyrhythmicarmmovementsinhumans AT yuripivanenko locomotorlikelegmovementsevokedbyrhythmicarmmovementsinhumans AT michaeljmaclellan locomotorlikelegmovementsevokedbyrhythmicarmmovementsinhumans AT germanacappellini locomotorlikelegmovementsevokedbyrhythmicarmmovementsinhumans AT richardepoppele locomotorlikelegmovementsevokedbyrhythmicarmmovementsinhumans AT francescolacquaniti locomotorlikelegmovementsevokedbyrhythmicarmmovementsinhumans
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Locomotor-like leg movements evoked by rhythmic arm movements in humans.

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