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Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle

We determined the precise time windows of the electromyographic (EMG) response components triggered by ankle motion and by body sway above the ankle. A support surface under the feet of healthy young adult participants in the quiet stance was moved in translation. The EMG response component triggere...

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Autores principales: Hiraoka, Koichi, Kuramitsu, Toru, Nii, Naoki, Osumi, Miyuki, Tanaka, Nana
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7226339/
https://www.ncbi.nlm.nih.gov/pubmed/32290377
http://dx.doi.org/10.3390/brainsci10040230
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author Hiraoka, Koichi
Kuramitsu, Toru
Nii, Naoki
Osumi, Miyuki
Tanaka, Nana
author_facet Hiraoka, Koichi
Kuramitsu, Toru
Nii, Naoki
Osumi, Miyuki
Tanaka, Nana
author_sort Hiraoka, Koichi
collection PubMed
description We determined the precise time windows of the electromyographic (EMG) response components triggered by ankle motion and by body sway above the ankle. A support surface under the feet of healthy young adult participants in the quiet stance was moved in translation. The EMG response component triggered by body displacement above the ankle began at 95–100 ms and ended 145–155 ms after the onset of the support surface translation. The EMG response triggered by ankle dorsiflexion began at 35–50 ms and ended 110–115 ms after the onset of the translation in the soleus muscle, indicating that the response component began at a time similar to the short-latency response. In contrast, the response component in the gastrocnemius muscle began noticeably after that. The EMG response triggered by ankle dorsiflexion began at 75–85 ms and ended 125–135 ms after the onset of the translation in the gastrocnemius muscle. Our findings indicate that the threshold of the early response component to the somatic sensation of the ankle motion in the soleus muscle is lower than that in the gastrocnemius muscle. The response component triggered by the ankle motion continued long after the end of ankle dorsiflexion, indicating that the early component is mediated not only by the monosynaptic stretch reflex pathway but also by the polysynaptic pathway.
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spelling pubmed-72263392020-05-18 Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle Hiraoka, Koichi Kuramitsu, Toru Nii, Naoki Osumi, Miyuki Tanaka, Nana Brain Sci Article We determined the precise time windows of the electromyographic (EMG) response components triggered by ankle motion and by body sway above the ankle. A support surface under the feet of healthy young adult participants in the quiet stance was moved in translation. The EMG response component triggered by body displacement above the ankle began at 95–100 ms and ended 145–155 ms after the onset of the support surface translation. The EMG response triggered by ankle dorsiflexion began at 35–50 ms and ended 110–115 ms after the onset of the translation in the soleus muscle, indicating that the response component began at a time similar to the short-latency response. In contrast, the response component in the gastrocnemius muscle began noticeably after that. The EMG response triggered by ankle dorsiflexion began at 75–85 ms and ended 125–135 ms after the onset of the translation in the gastrocnemius muscle. Our findings indicate that the threshold of the early response component to the somatic sensation of the ankle motion in the soleus muscle is lower than that in the gastrocnemius muscle. The response component triggered by the ankle motion continued long after the end of ankle dorsiflexion, indicating that the early component is mediated not only by the monosynaptic stretch reflex pathway but also by the polysynaptic pathway. MDPI 2020-04-11 /pmc/articles/PMC7226339/ /pubmed/32290377 http://dx.doi.org/10.3390/brainsci10040230 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hiraoka, Koichi
Kuramitsu, Toru
Nii, Naoki
Osumi, Miyuki
Tanaka, Nana
Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle
title Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle
title_full Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle
title_fullStr Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle
title_full_unstemmed Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle
title_short Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle
title_sort time window of perturbation-induced response triggered by ankle motion and body sway above the ankle
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7226339/
https://www.ncbi.nlm.nih.gov/pubmed/32290377
http://dx.doi.org/10.3390/brainsci10040230
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