Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.

Characterizing the quasi-stiffness and work of lower extremity joints is critical for evaluating human locomotion and designing assistive devices such as prostheses and orthoses intended to emulate the biological behavior of human legs. This work aims to establish statistical models that allow us to...

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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/ec3dffc7d31b4bb0aba07ba861d3e266
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spelling	oai:doaj.org-article:ec3dffc7d31b4bb0aba07ba861d3e2662021-11-18T07:52:25ZEstimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.1932-620310.1371/journal.pone.0059935https://doaj.org/article/ec3dffc7d31b4bb0aba07ba861d3e2662013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23555839/?tool=EBIhttps://doaj.org/toc/1932-6203Characterizing the quasi-stiffness and work of lower extremity joints is critical for evaluating human locomotion and designing assistive devices such as prostheses and orthoses intended to emulate the biological behavior of human legs. This work aims to establish statistical models that allow us to predict the ankle quasi-stiffness and net mechanical work for adults walking on level ground. During the stance phase of walking, the ankle joint propels the body through three distinctive phases of nearly constant stiffness known as the quasi-stiffness of each phase. Using a generic equation for the ankle moment obtained through an inverse dynamics analysis, we identify key independent parameters needed to predict ankle quasi-stiffness and propulsive work and also the functional form of each correlation. These parameters include gait speed, ankle excursion, and subject height and weight. Based on the identified form of the correlation and key variables, we applied linear regression on experimental walking data for 216 gait trials across 26 subjects (speeds from 0.75-2.63 m/s) to obtain statistical models of varying complexity. The most general forms of the statistical models include all the key parameters and have an R(2) of 75% to 81% in the prediction of the ankle quasi-stiffnesses and propulsive work. The most specific models include only subject height and weight and could predict the ankle quasi-stiffnesses and work for optimal walking speed with average error of 13% to 30%. We discuss how these models provide a useful framework and foundation for designing subject- and gait-specific prosthetic and exoskeletal devices designed to emulate biological ankle function during level ground walking.Kamran ShamaeiGregory S SawickiAaron M DollarPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 3, p e59935 (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 and propulsive work of the human ankle in the stance phase of walking.
description	Characterizing the quasi-stiffness and work of lower extremity joints is critical for evaluating human locomotion and designing assistive devices such as prostheses and orthoses intended to emulate the biological behavior of human legs. This work aims to establish statistical models that allow us to predict the ankle quasi-stiffness and net mechanical work for adults walking on level ground. During the stance phase of walking, the ankle joint propels the body through three distinctive phases of nearly constant stiffness known as the quasi-stiffness of each phase. Using a generic equation for the ankle moment obtained through an inverse dynamics analysis, we identify key independent parameters needed to predict ankle quasi-stiffness and propulsive work and also the functional form of each correlation. These parameters include gait speed, ankle excursion, and subject height and weight. Based on the identified form of the correlation and key variables, we applied linear regression on experimental walking data for 216 gait trials across 26 subjects (speeds from 0.75-2.63 m/s) to obtain statistical models of varying complexity. The most general forms of the statistical models include all the key parameters and have an R(2) of 75% to 81% in the prediction of the ankle quasi-stiffnesses and propulsive work. The most specific models include only subject height and weight and could predict the ankle quasi-stiffnesses and work for optimal walking speed with average error of 13% to 30%. We discuss how these models provide a useful framework and foundation for designing subject- and gait-specific prosthetic and exoskeletal devices designed to emulate biological ankle function during level ground walking.
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 and propulsive work of the human ankle in the stance phase of walking.
title_short	Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.
title_full	Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.
title_fullStr	Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.
title_full_unstemmed	Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.
title_sort	estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/ec3dffc7d31b4bb0aba07ba861d3e266
work_keys_str_mv	AT kamranshamaei estimationofquasistiffnessandpropulsiveworkofthehumanankleinthestancephaseofwalking AT gregoryssawicki estimationofquasistiffnessandpropulsiveworkofthehumanankleinthestancephaseofwalking AT aaronmdollar estimationofquasistiffnessandpropulsiveworkofthehumanankleinthestancephaseofwalking
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Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking.

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