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Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?

Understanding the mechanisms humans use to stabilize walking is vital for predicting falls in elderly. Modeling studies identified two potential mechanisms to stabilize gait in the anterior-posterior direction: foot placement control and ankle push-off control: foot placement depends on position and...

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Autores principales: Jin, Jian, van Dieën, Jaap H., Kistemaker, Dinant, Daffertshofer, Andreas, Bruijn, Sjoerd M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10234269/
https://www.ncbi.nlm.nih.gov/pubmed/37273538
http://dx.doi.org/10.7717/peerj.15375
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author Jin, Jian
van Dieën, Jaap H.
Kistemaker, Dinant
Daffertshofer, Andreas
Bruijn, Sjoerd M.
author_facet Jin, Jian
van Dieën, Jaap H.
Kistemaker, Dinant
Daffertshofer, Andreas
Bruijn, Sjoerd M.
author_sort Jin, Jian
collection PubMed
description Understanding the mechanisms humans use to stabilize walking is vital for predicting falls in elderly. Modeling studies identified two potential mechanisms to stabilize gait in the anterior-posterior direction: foot placement control and ankle push-off control: foot placement depends on position and velocity of the center-of-mass (CoM) and push-off covaries with deviations between actual and predicted CoM trajectories. While both control mechanisms have been reported in humans, it is unknown whether especially the latter one is employed in unperturbed steady-state walking. Based on the finding of Wang and Srinivasan that foot placement deviates in the same direction as the CoM states in the preceding swing phase, and assuming that this covariance serves the role of stabilizing gait, the covariance between the CoM states and foot placement can be seen as a measure of foot placement accuracy. We subsequently interpreted the residual variance in foot placement from a linear regression model as “errors” that must be compensated, and investigated whether these foot placement errors were correlated to push-off kinetic time series of the subsequent double stance phase. We found ankle push-off torque to be correlated to the foot placement errors in 30 participants when walking at normal and slow speeds, with peak correlations over the double stance phase up to 0.39. Our study suggests that humans use a push-off strategy for correcting foot placement errors in steady-state walking.
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spelling pubmed-102342692023-06-02 Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states? Jin, Jian van Dieën, Jaap H. Kistemaker, Dinant Daffertshofer, Andreas Bruijn, Sjoerd M. PeerJ Kinesiology Understanding the mechanisms humans use to stabilize walking is vital for predicting falls in elderly. Modeling studies identified two potential mechanisms to stabilize gait in the anterior-posterior direction: foot placement control and ankle push-off control: foot placement depends on position and velocity of the center-of-mass (CoM) and push-off covaries with deviations between actual and predicted CoM trajectories. While both control mechanisms have been reported in humans, it is unknown whether especially the latter one is employed in unperturbed steady-state walking. Based on the finding of Wang and Srinivasan that foot placement deviates in the same direction as the CoM states in the preceding swing phase, and assuming that this covariance serves the role of stabilizing gait, the covariance between the CoM states and foot placement can be seen as a measure of foot placement accuracy. We subsequently interpreted the residual variance in foot placement from a linear regression model as “errors” that must be compensated, and investigated whether these foot placement errors were correlated to push-off kinetic time series of the subsequent double stance phase. We found ankle push-off torque to be correlated to the foot placement errors in 30 participants when walking at normal and slow speeds, with peak correlations over the double stance phase up to 0.39. Our study suggests that humans use a push-off strategy for correcting foot placement errors in steady-state walking. PeerJ Inc. 2023-05-29 /pmc/articles/PMC10234269/ /pubmed/37273538 http://dx.doi.org/10.7717/peerj.15375 Text en ©2023 Jin et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Kinesiology
Jin, Jian
van Dieën, Jaap H.
Kistemaker, Dinant
Daffertshofer, Andreas
Bruijn, Sjoerd M.
Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
title Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
title_full Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
title_fullStr Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
title_full_unstemmed Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
title_short Does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
title_sort does ankle push-off correct for errors in anterior–posterior foot placement relative to center-of-mass states?
topic Kinesiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10234269/
https://www.ncbi.nlm.nih.gov/pubmed/37273538
http://dx.doi.org/10.7717/peerj.15375
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