Estimation of quasi-stiffness of the human hip in the stance phase of walking.

This work presents a framework for selection of subject-specific quasi-stiffness of hip orthoses and exoskeletons, and other devices that are intended to emulate the biological performance of this joint during walking. The hip joint exhibits linear moment-angular excursion behavior in both the exten...

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Autores principales:	Kamran Shamaei, Gregory S Sawicki, Aaron M Dollar
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9772fd163f4d4bdc8a79a3eec96adff5
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id	oai:doaj.org-article:9772fd163f4d4bdc8a79a3eec96adff5
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spelling	oai:doaj.org-article:9772fd163f4d4bdc8a79a3eec96adff52021-11-18T08:42:55ZEstimation of quasi-stiffness of the human hip in the stance phase of walking.1932-620310.1371/journal.pone.0081841https://doaj.org/article/9772fd163f4d4bdc8a79a3eec96adff52013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24349136/?tool=EBIhttps://doaj.org/toc/1932-6203This work presents a framework for selection of subject-specific quasi-stiffness of hip orthoses and exoskeletons, and other devices that are intended to emulate the biological performance of this joint during walking. The hip joint exhibits linear moment-angular excursion behavior in both the extension and flexion stages of the resilient loading-unloading phase that consists of terminal stance and initial swing phases. Here, we establish statistical models that can closely estimate the slope of linear fits to the moment-angle graph of the hip in this phase, termed as the quasi-stiffness of the hip. Employing an inverse dynamics analysis, we identify a series of parameters that can capture the nearly linear hip quasi-stiffnesses in the resilient loading phase. We then employ regression analysis on experimental moment-angle data of 216 gait trials across 26 human adults walking over a wide range of gait speeds (0.75-2.63 m/s) to obtain a set of general-form statistical models that estimate the hip quasi-stiffnesses using body weight and height, gait speed, and hip excursion. We show that the general-form models can closely estimate the hip quasi-stiffness in the extension (R(2) = 92%) and flexion portions (R(2) = 89%) of the resilient loading phase of the gait. We further simplify the general-form models and present a set of stature-based models that can estimate the hip quasi-stiffness for the preferred gait speed using only body weight and height with an average error of 27% for the extension stage and 37% for the flexion stage.Kamran ShamaeiGregory S SawickiAaron M DollarPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 12, p e81841 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kamran Shamaei Gregory S Sawicki Aaron M Dollar Estimation of quasi-stiffness of the human hip in the stance phase of walking.
description	This work presents a framework for selection of subject-specific quasi-stiffness of hip orthoses and exoskeletons, and other devices that are intended to emulate the biological performance of this joint during walking. The hip joint exhibits linear moment-angular excursion behavior in both the extension and flexion stages of the resilient loading-unloading phase that consists of terminal stance and initial swing phases. Here, we establish statistical models that can closely estimate the slope of linear fits to the moment-angle graph of the hip in this phase, termed as the quasi-stiffness of the hip. Employing an inverse dynamics analysis, we identify a series of parameters that can capture the nearly linear hip quasi-stiffnesses in the resilient loading phase. We then employ regression analysis on experimental moment-angle data of 216 gait trials across 26 human adults walking over a wide range of gait speeds (0.75-2.63 m/s) to obtain a set of general-form statistical models that estimate the hip quasi-stiffnesses using body weight and height, gait speed, and hip excursion. We show that the general-form models can closely estimate the hip quasi-stiffness in the extension (R(2) = 92%) and flexion portions (R(2) = 89%) of the resilient loading phase of the gait. We further simplify the general-form models and present a set of stature-based models that can estimate the hip quasi-stiffness for the preferred gait speed using only body weight and height with an average error of 27% for the extension stage and 37% for the flexion stage.
format	article
author	Kamran Shamaei Gregory S Sawicki Aaron M Dollar
author_facet	Kamran Shamaei Gregory S Sawicki Aaron M Dollar
author_sort	Kamran Shamaei
title	Estimation of quasi-stiffness of the human hip in the stance phase of walking.
title_short	Estimation of quasi-stiffness of the human hip in the stance phase of walking.
title_full	Estimation of quasi-stiffness of the human hip in the stance phase of walking.
title_fullStr	Estimation of quasi-stiffness of the human hip in the stance phase of walking.
title_full_unstemmed	Estimation of quasi-stiffness of the human hip in the stance phase of walking.
title_sort	estimation of quasi-stiffness of the human hip in the stance phase of walking.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/9772fd163f4d4bdc8a79a3eec96adff5
work_keys_str_mv	AT kamranshamaei estimationofquasistiffnessofthehumanhipinthestancephaseofwalking AT gregoryssawicki estimationofquasistiffnessofthehumanhipinthestancephaseofwalking AT aaronmdollar estimationofquasistiffnessofthehumanhipinthestancephaseofwalking
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Estimation of quasi-stiffness of the human hip in the stance phase of walking.

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