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Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation

Age-related changes cause more fall-related injuries and impede the recoveries by older adults compared to younger adults. This study assessed the lower limb joint moments and muscle responses to split-belt treadmill perturbations in two groups (14 healthy young group [23.36 ± 2.90 years] and 14 hea...

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Autores principales: Yoo, Dongyual, An, Junmo, Seo, Kap-Ho, Lee, Beom-Chan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8326400/
https://www.ncbi.nlm.nih.gov/pubmed/34350396
http://dx.doi.org/10.3389/fspor.2021.683039
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author Yoo, Dongyual
An, Junmo
Seo, Kap-Ho
Lee, Beom-Chan
author_facet Yoo, Dongyual
An, Junmo
Seo, Kap-Ho
Lee, Beom-Chan
author_sort Yoo, Dongyual
collection PubMed
description Age-related changes cause more fall-related injuries and impede the recoveries by older adults compared to younger adults. This study assessed the lower limb joint moments and muscle responses to split-belt treadmill perturbations in two groups (14 healthy young group [23.36 ± 2.90 years] and 14 healthy older group [70.93 ± 4.36 years]) who performed two trials of unexpected split-belt treadmill perturbations while walking on a programmable split-belt treadmill. A motion capture system quantified the lower limb joint moments, and a wireless electromyography system recorded the lower limb muscle responses. The compensatory limb's (i.e., the tripped limb's contralateral side) joint moments and muscle responses were computed during the pre-perturbation period (the five gait cycles before the onset of a split-belt treadmill perturbation) and the recovery period (from the split-belt treadmill perturbation to the baseline gait relying on the ground reaction forces' profile). Joint moments were assessed by maximum joint moments, and muscle responses were quantified by the normalization (%) and co-contraction index (CCI). Joint moments and muscle responses of the compensatory limb during the recovery period were significantly higher for the YG than the OG, and joint moments (e.g., knee flexion and extension and hip flexion moments) and muscle responses during the recovery period were higher compared to the pre-perturbation period for both groups. For CCI, the older group showed significantly higher co-contraction for biceps femoris/rectus femoris muscles than the young group during the recovery period. For both groups, co-contraction for biceps femoris/rectus femoris muscles was higher during the pre-perturbation period than the recovery period. The study confirmed that older adults compensated for muscle weakness by using lower joint moments and muscle activations and increasing muscle co-contractions to recover balance after split-belt treadmill perturbations. A better understanding of the recovery mechanisms of older adults who train on fall-inducing systems could improve therapeutic regimens.
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spelling pubmed-83264002021-08-03 Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation Yoo, Dongyual An, Junmo Seo, Kap-Ho Lee, Beom-Chan Front Sports Act Living Sports and Active Living Age-related changes cause more fall-related injuries and impede the recoveries by older adults compared to younger adults. This study assessed the lower limb joint moments and muscle responses to split-belt treadmill perturbations in two groups (14 healthy young group [23.36 ± 2.90 years] and 14 healthy older group [70.93 ± 4.36 years]) who performed two trials of unexpected split-belt treadmill perturbations while walking on a programmable split-belt treadmill. A motion capture system quantified the lower limb joint moments, and a wireless electromyography system recorded the lower limb muscle responses. The compensatory limb's (i.e., the tripped limb's contralateral side) joint moments and muscle responses were computed during the pre-perturbation period (the five gait cycles before the onset of a split-belt treadmill perturbation) and the recovery period (from the split-belt treadmill perturbation to the baseline gait relying on the ground reaction forces' profile). Joint moments were assessed by maximum joint moments, and muscle responses were quantified by the normalization (%) and co-contraction index (CCI). Joint moments and muscle responses of the compensatory limb during the recovery period were significantly higher for the YG than the OG, and joint moments (e.g., knee flexion and extension and hip flexion moments) and muscle responses during the recovery period were higher compared to the pre-perturbation period for both groups. For CCI, the older group showed significantly higher co-contraction for biceps femoris/rectus femoris muscles than the young group during the recovery period. For both groups, co-contraction for biceps femoris/rectus femoris muscles was higher during the pre-perturbation period than the recovery period. The study confirmed that older adults compensated for muscle weakness by using lower joint moments and muscle activations and increasing muscle co-contractions to recover balance after split-belt treadmill perturbations. A better understanding of the recovery mechanisms of older adults who train on fall-inducing systems could improve therapeutic regimens. Frontiers Media S.A. 2021-07-19 /pmc/articles/PMC8326400/ /pubmed/34350396 http://dx.doi.org/10.3389/fspor.2021.683039 Text en Copyright © 2021 Yoo, An, Seo and Lee. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Sports and Active Living
Yoo, Dongyual
An, Junmo
Seo, Kap-Ho
Lee, Beom-Chan
Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation
title Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation
title_full Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation
title_fullStr Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation
title_full_unstemmed Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation
title_short Aging Affects Lower Limb Joint Moments and Muscle Responses to a Split-Belt Treadmill Perturbation
title_sort aging affects lower limb joint moments and muscle responses to a split-belt treadmill perturbation
topic Sports and Active Living
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8326400/
https://www.ncbi.nlm.nih.gov/pubmed/34350396
http://dx.doi.org/10.3389/fspor.2021.683039
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