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Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions

BACKGROUND: The effect of foot, especially intrinsic muscles, on postural control and its related mechanisms remain unclear due to the complex structure. Therefore, this study aims to investigate the activation of intrinsic foot muscles in the elderly under static and dynamic postural tasks. METHODS...

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Autores principales: Lai, Zhangqi, Wang, Ruiyan, Zhou, Bangguo, Chen, Jing, Wang, Lin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10362842/
https://www.ncbi.nlm.nih.gov/pubmed/37483972
http://dx.doi.org/10.7717/peerj.15719
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author Lai, Zhangqi
Wang, Ruiyan
Zhou, Bangguo
Chen, Jing
Wang, Lin
author_facet Lai, Zhangqi
Wang, Ruiyan
Zhou, Bangguo
Chen, Jing
Wang, Lin
author_sort Lai, Zhangqi
collection PubMed
description BACKGROUND: The effect of foot, especially intrinsic muscles, on postural control and its related mechanisms remain unclear due to the complex structure. Therefore, this study aims to investigate the activation of intrinsic foot muscles in the elderly under static and dynamic postural tasks. METHODS: Twenty-one elderly participants were included to perform different postural tests (sensory organization test (SOT), motor control test (MCT), limit of stability test (LOS), and unilateral stance test) by a NeuroCom Balance Manager System. The participants were instructed to maintain postural stability under conditions with combined different sensory inputs (vision, vestibular, and proprioception) in SOT as well as conditions with translation disturbance in MCT, and to perform an active weight-shifting tasks in LOS. During these tasks, muscle activation were simultaneously acquired from intrinsic foot muscles (abductor halluces (AbH) and flexor digitorum brevis (FDB)) and ankle muscles (anterior tibialis, medial head of gastrocnemius, lateral head of gastrocnemius, and peroneus longus). The root-mean-square amplitude of these muscles in postural tasks was calculated and normalized with the EMG activity in unilateral stance task. RESULTS: The activation of intrinsic foot muscles significantly differed among different SOT tasks (p < 0.001). Post-hoc tests showed that compared with that under normal condition 1 without sensory interference, EMGs increased significantly under sensory disturbance (conditions 2–6). By contrast, compared with that under the single-sensory disturbed conditions (conditions 2–4; 2 for disturbed vision, 3 for disturbed vestibular sensation, 4 for disturbed proprioception), activation was significantly greater under the dual-sensory disturbed postural tasks (conditions 5 and 6; 5 for disturbed vision and proprioception, 6 for disturbed vestibular sensation and proprioception). In MCT, EMGs of foot muscles increased significantly under different translation speeds (p < 0.001). In LOS, moderate and significant correlations were found between muscle activations and postural stability parameters (AbH, r = 0. 355–0.636, p < 0.05; FDB, r = 0.336–0.622, p < 0.05). CONCLUSION: Intrinsic foot muscles play a complementary role to regulate postural stability when disturbances occur. In addition, the recruitment magnitude of intrinsic foot muscles is positively correlated with the limit of stability, indicating their contribution to increasing the limits of stability in the elderly.
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spelling pubmed-103628422023-07-23 Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions Lai, Zhangqi Wang, Ruiyan Zhou, Bangguo Chen, Jing Wang, Lin PeerJ Geriatrics BACKGROUND: The effect of foot, especially intrinsic muscles, on postural control and its related mechanisms remain unclear due to the complex structure. Therefore, this study aims to investigate the activation of intrinsic foot muscles in the elderly under static and dynamic postural tasks. METHODS: Twenty-one elderly participants were included to perform different postural tests (sensory organization test (SOT), motor control test (MCT), limit of stability test (LOS), and unilateral stance test) by a NeuroCom Balance Manager System. The participants were instructed to maintain postural stability under conditions with combined different sensory inputs (vision, vestibular, and proprioception) in SOT as well as conditions with translation disturbance in MCT, and to perform an active weight-shifting tasks in LOS. During these tasks, muscle activation were simultaneously acquired from intrinsic foot muscles (abductor halluces (AbH) and flexor digitorum brevis (FDB)) and ankle muscles (anterior tibialis, medial head of gastrocnemius, lateral head of gastrocnemius, and peroneus longus). The root-mean-square amplitude of these muscles in postural tasks was calculated and normalized with the EMG activity in unilateral stance task. RESULTS: The activation of intrinsic foot muscles significantly differed among different SOT tasks (p < 0.001). Post-hoc tests showed that compared with that under normal condition 1 without sensory interference, EMGs increased significantly under sensory disturbance (conditions 2–6). By contrast, compared with that under the single-sensory disturbed conditions (conditions 2–4; 2 for disturbed vision, 3 for disturbed vestibular sensation, 4 for disturbed proprioception), activation was significantly greater under the dual-sensory disturbed postural tasks (conditions 5 and 6; 5 for disturbed vision and proprioception, 6 for disturbed vestibular sensation and proprioception). In MCT, EMGs of foot muscles increased significantly under different translation speeds (p < 0.001). In LOS, moderate and significant correlations were found between muscle activations and postural stability parameters (AbH, r = 0. 355–0.636, p < 0.05; FDB, r = 0.336–0.622, p < 0.05). CONCLUSION: Intrinsic foot muscles play a complementary role to regulate postural stability when disturbances occur. In addition, the recruitment magnitude of intrinsic foot muscles is positively correlated with the limit of stability, indicating their contribution to increasing the limits of stability in the elderly. PeerJ Inc. 2023-07-19 /pmc/articles/PMC10362842/ /pubmed/37483972 http://dx.doi.org/10.7717/peerj.15719 Text en ©2023 Lai 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 Geriatrics
Lai, Zhangqi
Wang, Ruiyan
Zhou, Bangguo
Chen, Jing
Wang, Lin
Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
title Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
title_full Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
title_fullStr Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
title_full_unstemmed Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
title_short Difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
title_sort difference in the recruitment of intrinsic foot muscles in the elderly under static and dynamic postural conditions
topic Geriatrics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10362842/
https://www.ncbi.nlm.nih.gov/pubmed/37483972
http://dx.doi.org/10.7717/peerj.15719
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