Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost

Abstract The theory that the sensorimotor system minimizes energetic cost during locomotion has long been supported by both computational models and empirical studies. However, it has yet to be determined if the behavior to which people converge when exposed to a novel perturbation during locomotion...

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Autores principales:	Natalia Sánchez, Sungwoo Park, James M. Finley
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2d9684101ea0407d98ddc3497fb43c24
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spelling	oai:doaj.org-article:2d9684101ea0407d98ddc3497fb43c242021-12-02T15:06:04ZEvidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost10.1038/s41598-017-08147-y2045-2322https://doaj.org/article/2d9684101ea0407d98ddc3497fb43c242017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08147-yhttps://doaj.org/toc/2045-2322Abstract The theory that the sensorimotor system minimizes energetic cost during locomotion has long been supported by both computational models and empirical studies. However, it has yet to be determined if the behavior to which people converge when exposed to a novel perturbation during locomotion is also energetically optimal. We address this issue in the context of adaptation to walking on a split-belt treadmill, which can impose a left-right asymmetry in step lengths. In response to this asymmetry, participants gradually adjust their foot placement to adopt steps of equal length. Here, we characterized metabolic, mechanical, and perceptual estimates of energetic cost associated with a range of asymmetries to determine whether symmetry is the energetically optimal strategy for walking on a split-belt treadmill. We found that taking steps of equal length did not minimize metabolic cost or mechanical cost. In addition, perceptual estimates of cost were not sensitive to changes in asymmetry. However, symmetry was identified as the optimal strategy when energetic cost was estimated from a composite metric that combined both metabolic and mechanical costs. These results suggest that adaptation may arise from optimization of a composite estimate of effort derived from feedback about the interaction between the body and environment.Natalia SánchezSungwoo ParkJames M. FinleyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Natalia Sánchez Sungwoo Park James M. Finley Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost
description	Abstract The theory that the sensorimotor system minimizes energetic cost during locomotion has long been supported by both computational models and empirical studies. However, it has yet to be determined if the behavior to which people converge when exposed to a novel perturbation during locomotion is also energetically optimal. We address this issue in the context of adaptation to walking on a split-belt treadmill, which can impose a left-right asymmetry in step lengths. In response to this asymmetry, participants gradually adjust their foot placement to adopt steps of equal length. Here, we characterized metabolic, mechanical, and perceptual estimates of energetic cost associated with a range of asymmetries to determine whether symmetry is the energetically optimal strategy for walking on a split-belt treadmill. We found that taking steps of equal length did not minimize metabolic cost or mechanical cost. In addition, perceptual estimates of cost were not sensitive to changes in asymmetry. However, symmetry was identified as the optimal strategy when energetic cost was estimated from a composite metric that combined both metabolic and mechanical costs. These results suggest that adaptation may arise from optimization of a composite estimate of effort derived from feedback about the interaction between the body and environment.
format	article
author	Natalia Sánchez Sungwoo Park James M. Finley
author_facet	Natalia Sánchez Sungwoo Park James M. Finley
author_sort	Natalia Sánchez
title	Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost
title_short	Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost
title_full	Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost
title_fullStr	Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost
title_full_unstemmed	Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost
title_sort	evidence of energetic optimization during adaptation differs for metabolic, mechanical, and perceptual estimates of energetic cost
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2d9684101ea0407d98ddc3497fb43c24
work_keys_str_mv	AT nataliasanchez evidenceofenergeticoptimizationduringadaptationdiffersformetabolicmechanicalandperceptualestimatesofenergeticcost AT sungwoopark evidenceofenergeticoptimizationduringadaptationdiffersformetabolicmechanicalandperceptualestimatesofenergeticcost AT jamesmfinley evidenceofenergeticoptimizationduringadaptationdiffersformetabolicmechanicalandperceptualestimatesofenergeticcost
_version_	1718388568561287168

Evidence of Energetic Optimization during Adaptation Differs for Metabolic, Mechanical, and Perceptual Estimates of Energetic Cost

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