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Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes
The adaptation of neural contractile properties has been observed in previous work. However, the neural changes on the motor unit (MU) level remain largely unknown. Voluntary movements are controlled through the precise activation of MU populations. In this work, we estimate the neural inputs from t...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9585313/ https://www.ncbi.nlm.nih.gov/pubmed/36277210 http://dx.doi.org/10.3389/fphys.2022.994857 |
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author | Qiu, Fang Liu, Xiaodong Xu, Yilin Shi, Lijun Sheng, Xinjun Chen, Chen |
author_facet | Qiu, Fang Liu, Xiaodong Xu, Yilin Shi, Lijun Sheng, Xinjun Chen, Chen |
author_sort | Qiu, Fang |
collection | PubMed |
description | The adaptation of neural contractile properties has been observed in previous work. However, the neural changes on the motor unit (MU) level remain largely unknown. Voluntary movements are controlled through the precise activation of MU populations. In this work, we estimate the neural inputs from the spinal motor neurons to the muscles during isometric contractions and characterize the neural adaptation during training by comparing the MU properties decomposed from sprinters and nonathletes. Twenty subjects were recruited and divided into two groups. The high-density surface electromyography (EMG) signals were recorded from the lateralis vastus muscle during the isometric contraction of knee extension and were then decomposed into MU spike trains. Each MU’s action potentials and discharge properties were extracted for comparison across subject groups and tasks. A total of 1097 MUs were identified from all subjects. Results showed that the discharge rates and amplitudes of MUAPs from athletes were significantly higher than those from nonathletes. These results demonstrate the neural adaptations in physical training at the MU population level and indicate the great potential of EMG decomposition in physiological investigations. |
format | Online Article Text |
id | pubmed-9585313 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-95853132022-10-22 Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes Qiu, Fang Liu, Xiaodong Xu, Yilin Shi, Lijun Sheng, Xinjun Chen, Chen Front Physiol Physiology The adaptation of neural contractile properties has been observed in previous work. However, the neural changes on the motor unit (MU) level remain largely unknown. Voluntary movements are controlled through the precise activation of MU populations. In this work, we estimate the neural inputs from the spinal motor neurons to the muscles during isometric contractions and characterize the neural adaptation during training by comparing the MU properties decomposed from sprinters and nonathletes. Twenty subjects were recruited and divided into two groups. The high-density surface electromyography (EMG) signals were recorded from the lateralis vastus muscle during the isometric contraction of knee extension and were then decomposed into MU spike trains. Each MU’s action potentials and discharge properties were extracted for comparison across subject groups and tasks. A total of 1097 MUs were identified from all subjects. Results showed that the discharge rates and amplitudes of MUAPs from athletes were significantly higher than those from nonathletes. These results demonstrate the neural adaptations in physical training at the MU population level and indicate the great potential of EMG decomposition in physiological investigations. Frontiers Media S.A. 2022-10-07 /pmc/articles/PMC9585313/ /pubmed/36277210 http://dx.doi.org/10.3389/fphys.2022.994857 Text en Copyright © 2022 Qiu, Liu, Xu, Shi, Sheng and Chen. 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 | Physiology Qiu, Fang Liu, Xiaodong Xu, Yilin Shi, Lijun Sheng, Xinjun Chen, Chen Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes |
title | Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes |
title_full | Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes |
title_fullStr | Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes |
title_full_unstemmed | Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes |
title_short | Neural inputs from spinal motor neurons to lateralis vastus muscle: Comparison between sprinters and nonathletes |
title_sort | neural inputs from spinal motor neurons to lateralis vastus muscle: comparison between sprinters and nonathletes |
topic | Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9585313/ https://www.ncbi.nlm.nih.gov/pubmed/36277210 http://dx.doi.org/10.3389/fphys.2022.994857 |
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