Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.

The present study was designed to assess the relative contribution of each leg to unperturbed bipedal posture in lower limb amputees. To achieve this goal, eight unilateral traumatic trans-femoral amputees (TFA) were asked to stand as still as possible on a plantar pressure data acquisition system w...

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Autores principales:	Petra Hlavackova, Céline Franco, Bruno Diot, Nicolas Vuillerme
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/23ab6773d68e415a80d04f516d73829a
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spelling	oai:doaj.org-article:23ab6773d68e415a80d04f516d73829a2021-11-18T06:54:01ZContribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.1932-620310.1371/journal.pone.0019661https://doaj.org/article/23ab6773d68e415a80d04f516d73829a2011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21603630/?tool=EBIhttps://doaj.org/toc/1932-6203The present study was designed to assess the relative contribution of each leg to unperturbed bipedal posture in lower limb amputees. To achieve this goal, eight unilateral traumatic trans-femoral amputees (TFA) were asked to stand as still as possible on a plantar pressure data acquisition system with their eyes closed. Four dependent variables were computed to describe the subject's postural behavior: (1) body weight distribution, (2) amplitude, (3) velocity and (4) regularity of centre of foot pressure (CoP) trajectories under the amputated (A) leg and the non-amputated (NA) leg. Results showed a larger body weight distribution applied to the NA leg than to the A leg and a more regular CoP profiles (lower sample entropy values) with greater amplitude and velocity under the NA leg than under the A leg. Taken together, these findings suggest that the NA leg and the A leg do not equally contribute to the control of unperturbed bipedal posture in TFA. The observation that TFA do actively control unperturbed bipedal posture with their NA leg could be viewed as an adaptive process to the loss of the lower leg afferents and efferents because of the unilateral lower-limb amputation. From a methodological point of view, these results demonstrate the suitability of computing bilateral CoP trajectories regularity for the assessment of lateralized postural control under pathological conditions.Petra HlavackovaCéline FrancoBruno DiotNicolas VuillermePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 5, p e19661 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Petra Hlavackova Céline Franco Bruno Diot Nicolas Vuillerme Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
description	The present study was designed to assess the relative contribution of each leg to unperturbed bipedal posture in lower limb amputees. To achieve this goal, eight unilateral traumatic trans-femoral amputees (TFA) were asked to stand as still as possible on a plantar pressure data acquisition system with their eyes closed. Four dependent variables were computed to describe the subject's postural behavior: (1) body weight distribution, (2) amplitude, (3) velocity and (4) regularity of centre of foot pressure (CoP) trajectories under the amputated (A) leg and the non-amputated (NA) leg. Results showed a larger body weight distribution applied to the NA leg than to the A leg and a more regular CoP profiles (lower sample entropy values) with greater amplitude and velocity under the NA leg than under the A leg. Taken together, these findings suggest that the NA leg and the A leg do not equally contribute to the control of unperturbed bipedal posture in TFA. The observation that TFA do actively control unperturbed bipedal posture with their NA leg could be viewed as an adaptive process to the loss of the lower leg afferents and efferents because of the unilateral lower-limb amputation. From a methodological point of view, these results demonstrate the suitability of computing bilateral CoP trajectories regularity for the assessment of lateralized postural control under pathological conditions.
format	article
author	Petra Hlavackova Céline Franco Bruno Diot Nicolas Vuillerme
author_facet	Petra Hlavackova Céline Franco Bruno Diot Nicolas Vuillerme
author_sort	Petra Hlavackova
title	Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
title_short	Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
title_full	Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
title_fullStr	Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
title_full_unstemmed	Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
title_sort	contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/23ab6773d68e415a80d04f516d73829a
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Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.

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