A biomechanical study of load carriage by two paired subjects in response to increased load mass

Abstract The biomechanics of load carriage has been studied extensively with regards to single individuals, yet not so much with regards to collective transport. We investigated the biomechanics of walking in 10 paired individuals carrying a load that represented 20%, 30%, or 40% of the aggregated b...

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Autores principales:	Guillaume Fumery, Nicolas A. Turpin, Laetitia Claverie, Vincent Fourcassié, Pierre Moretto
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a25f769e002e4fdeade7126d9d425fff
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spelling	oai:doaj.org-article:a25f769e002e4fdeade7126d9d425fff2021-12-02T14:28:19ZA biomechanical study of load carriage by two paired subjects in response to increased load mass10.1038/s41598-021-83760-62045-2322https://doaj.org/article/a25f769e002e4fdeade7126d9d425fff2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83760-6https://doaj.org/toc/2045-2322Abstract The biomechanics of load carriage has been studied extensively with regards to single individuals, yet not so much with regards to collective transport. We investigated the biomechanics of walking in 10 paired individuals carrying a load that represented 20%, 30%, or 40% of the aggregated body-masses. We computed the energy recovery rate at the center of mass of the system consisting of the two individuals plus the carried load in order to test to what extent the pendulum-like behavior and the economy of the gait were affected. Joint torque was also computed to investigate the intra- and inter-subject strategies occurring in response to this. The ability of the subjects to move the whole system like a pendulum appeared rendered obvious through shortened step length and lowered vertical displacements at the center of mass of the system, while energy recovery rate and total mechanical energy remained constant. In parallel, an asymmetry of joint moment vertical amplitude and coupling among individuals in all pairs suggested the emergence of a leader/follower schema. Beyond the 30% threshold of increased load mass, the constraints at the joint level were balanced among individuals leading to a degraded pendulum-like behavior.Guillaume FumeryNicolas A. TurpinLaetitia ClaverieVincent FourcassiéPierre MorettoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Guillaume Fumery Nicolas A. Turpin Laetitia Claverie Vincent Fourcassié Pierre Moretto A biomechanical study of load carriage by two paired subjects in response to increased load mass
description	Abstract The biomechanics of load carriage has been studied extensively with regards to single individuals, yet not so much with regards to collective transport. We investigated the biomechanics of walking in 10 paired individuals carrying a load that represented 20%, 30%, or 40% of the aggregated body-masses. We computed the energy recovery rate at the center of mass of the system consisting of the two individuals plus the carried load in order to test to what extent the pendulum-like behavior and the economy of the gait were affected. Joint torque was also computed to investigate the intra- and inter-subject strategies occurring in response to this. The ability of the subjects to move the whole system like a pendulum appeared rendered obvious through shortened step length and lowered vertical displacements at the center of mass of the system, while energy recovery rate and total mechanical energy remained constant. In parallel, an asymmetry of joint moment vertical amplitude and coupling among individuals in all pairs suggested the emergence of a leader/follower schema. Beyond the 30% threshold of increased load mass, the constraints at the joint level were balanced among individuals leading to a degraded pendulum-like behavior.
format	article
author	Guillaume Fumery Nicolas A. Turpin Laetitia Claverie Vincent Fourcassié Pierre Moretto
author_facet	Guillaume Fumery Nicolas A. Turpin Laetitia Claverie Vincent Fourcassié Pierre Moretto
author_sort	Guillaume Fumery
title	A biomechanical study of load carriage by two paired subjects in response to increased load mass
title_short	A biomechanical study of load carriage by two paired subjects in response to increased load mass
title_full	A biomechanical study of load carriage by two paired subjects in response to increased load mass
title_fullStr	A biomechanical study of load carriage by two paired subjects in response to increased load mass
title_full_unstemmed	A biomechanical study of load carriage by two paired subjects in response to increased load mass
title_sort	biomechanical study of load carriage by two paired subjects in response to increased load mass
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a25f769e002e4fdeade7126d9d425fff
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A biomechanical study of load carriage by two paired subjects in response to increased load mass

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