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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...

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Autores principales: Qiu, Fang, Liu, Xiaodong, Xu, Yilin, Shi, Lijun, Sheng, Xinjun, Chen, Chen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
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.
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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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