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Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles
While previous studies have shown that muscle stretching suppresses monosynaptic spinal reflex excitability in stretched muscles, its effects on non-stretched muscles is still largely unknown. The purpose of this study was to examine the effects of muscle stretching on monosynaptic spinal reflex in...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5491176/ https://www.ncbi.nlm.nih.gov/pubmed/28662201 http://dx.doi.org/10.1371/journal.pone.0180275 |
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author | Masugi, Yohei Obata, Hiroki Inoue, Daisuke Kawashima, Noritaka Nakazawa, Kimitaka |
author_facet | Masugi, Yohei Obata, Hiroki Inoue, Daisuke Kawashima, Noritaka Nakazawa, Kimitaka |
author_sort | Masugi, Yohei |
collection | PubMed |
description | While previous studies have shown that muscle stretching suppresses monosynaptic spinal reflex excitability in stretched muscles, its effects on non-stretched muscles is still largely unknown. The purpose of this study was to examine the effects of muscle stretching on monosynaptic spinal reflex in non-stretched muscles. Ten healthy male subjects participated in this study. Muscle stretching of the right triceps surae muscle was performed using a motor torque device for 1 minute. Three different dorsiflexion torques (at approximately 5, 10, and 15 Nm) were applied during muscle stretching. Spinal reflexes evoked by transcutaneous spinal cord stimulation were recorded in both the lower-limb muscles before, during, and at 0 and 5 min following muscle stretching. The amplitudes of the spinal reflexes in both the stretched and non-stretched muscles in the right (ipsilateral) leg were smaller during stretching compared to before, and at 0 and 5 min after stretching. Furthermore, the degree of reduction in the amplitude of the spinal reflexes in the right (ipsilateral) leg muscles increased significantly as the dorsiflexion torque (i.e., stretching of the right triceps surae muscles) increased. In contrast, reduction in the amplitude of the spinal reflexes with increasing dorsiflexion torque was not seen in the left (contralateral) leg muscles. Our results clearly indicate that muscle stretching has inhibitory effects on monosynaptic spinal reflexes, not only in stretched muscles, but also in non-stretched muscles of the ipsilateral leg. |
format | Online Article Text |
id | pubmed-5491176 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-54911762017-07-18 Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles Masugi, Yohei Obata, Hiroki Inoue, Daisuke Kawashima, Noritaka Nakazawa, Kimitaka PLoS One Research Article While previous studies have shown that muscle stretching suppresses monosynaptic spinal reflex excitability in stretched muscles, its effects on non-stretched muscles is still largely unknown. The purpose of this study was to examine the effects of muscle stretching on monosynaptic spinal reflex in non-stretched muscles. Ten healthy male subjects participated in this study. Muscle stretching of the right triceps surae muscle was performed using a motor torque device for 1 minute. Three different dorsiflexion torques (at approximately 5, 10, and 15 Nm) were applied during muscle stretching. Spinal reflexes evoked by transcutaneous spinal cord stimulation were recorded in both the lower-limb muscles before, during, and at 0 and 5 min following muscle stretching. The amplitudes of the spinal reflexes in both the stretched and non-stretched muscles in the right (ipsilateral) leg were smaller during stretching compared to before, and at 0 and 5 min after stretching. Furthermore, the degree of reduction in the amplitude of the spinal reflexes in the right (ipsilateral) leg muscles increased significantly as the dorsiflexion torque (i.e., stretching of the right triceps surae muscles) increased. In contrast, reduction in the amplitude of the spinal reflexes with increasing dorsiflexion torque was not seen in the left (contralateral) leg muscles. Our results clearly indicate that muscle stretching has inhibitory effects on monosynaptic spinal reflexes, not only in stretched muscles, but also in non-stretched muscles of the ipsilateral leg. Public Library of Science 2017-06-29 /pmc/articles/PMC5491176/ /pubmed/28662201 http://dx.doi.org/10.1371/journal.pone.0180275 Text en © 2017 Masugi et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Masugi, Yohei Obata, Hiroki Inoue, Daisuke Kawashima, Noritaka Nakazawa, Kimitaka Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
title | Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
title_full | Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
title_fullStr | Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
title_full_unstemmed | Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
title_short | Neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
title_sort | neural effects of muscle stretching on the spinal reflexes in multiple lower-limb muscles |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5491176/ https://www.ncbi.nlm.nih.gov/pubmed/28662201 http://dx.doi.org/10.1371/journal.pone.0180275 |
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