Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.

The electromyographic (EMG) activity and force relationship, i.e. EMG-force relationship, is a valuable indicator of the degree of the neuromuscular activation during isometric force production. However, there is minimal information available regarding the EMG-force relationship of individual tricep...

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Autores principales:	Hiroshi Akima, Hisashi Maeda, Teruhiko Koike, Koji Ishida
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3a1389e7c7454f4a913232e31922c11a
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spelling	oai:doaj.org-article:3a1389e7c7454f4a913232e31922c11a2021-12-02T20:11:06ZEffect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.1932-620310.1371/journal.pone.0252644https://doaj.org/article/3a1389e7c7454f4a913232e31922c11a2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252644https://doaj.org/toc/1932-6203The electromyographic (EMG) activity and force relationship, i.e. EMG-force relationship, is a valuable indicator of the degree of the neuromuscular activation during isometric force production. However, there is minimal information available regarding the EMG-force relationship of individual triceps brachii (TB) muscles at different elbow joint angles. This study aimed to compare the EMG-force relationships of the medial (TB-Med), lateral (TB-Lat), and long heads (TB-Long) of the TB. 7 men and 10 women performed force matching isometric tasks at 20%, 40%, 60%, and 80%maximum voluntary contraction (MVC) at 60°, 90°, and 120° of extension. During the submaximal force matching tasks, the surface EMG signals of the TB-Med, TB-Lat, and TB-Long were recorded and calculated the root mean square (RMS). RMS of each force level were then normalized by RMS at 100%MVC. For the TB-Med, ultrasonography was used to determine the superficial region of the muscle that faced the skin surface to minimize cross-talk. The joint angle was monitored using an electrogoniometer. The elbow extension force, elbow joint angle, and surface EMG signals were simultaneously sampled at 2 kHz and stored on a personal computer. The RMS did not significantly differ between the three muscles, except between the TB-Med and TB-Lat during 20%MVC at 60°. The RMS during force levels of ≥ 60%MVC at 120° was significantly lower than that at 60° or 90° for each muscle. The sum of difference, which represents the difference in RMS from the identical line, did not significantly differ in any of the assessed muscles in the present study. This suggests that a relatively smaller neuromuscular activation could be required when the elbow joint angle was extended. However, neuromuscular activation levels and relative force levels were matched in all three TB synergists when the elbow joint angle was at 90° or a more flexed position.Hiroshi AkimaHisashi MaedaTeruhiko KoikeKoji IshidaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0252644 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hiroshi Akima Hisashi Maeda Teruhiko Koike Koji Ishida Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
description	The electromyographic (EMG) activity and force relationship, i.e. EMG-force relationship, is a valuable indicator of the degree of the neuromuscular activation during isometric force production. However, there is minimal information available regarding the EMG-force relationship of individual triceps brachii (TB) muscles at different elbow joint angles. This study aimed to compare the EMG-force relationships of the medial (TB-Med), lateral (TB-Lat), and long heads (TB-Long) of the TB. 7 men and 10 women performed force matching isometric tasks at 20%, 40%, 60%, and 80%maximum voluntary contraction (MVC) at 60°, 90°, and 120° of extension. During the submaximal force matching tasks, the surface EMG signals of the TB-Med, TB-Lat, and TB-Long were recorded and calculated the root mean square (RMS). RMS of each force level were then normalized by RMS at 100%MVC. For the TB-Med, ultrasonography was used to determine the superficial region of the muscle that faced the skin surface to minimize cross-talk. The joint angle was monitored using an electrogoniometer. The elbow extension force, elbow joint angle, and surface EMG signals were simultaneously sampled at 2 kHz and stored on a personal computer. The RMS did not significantly differ between the three muscles, except between the TB-Med and TB-Lat during 20%MVC at 60°. The RMS during force levels of ≥ 60%MVC at 120° was significantly lower than that at 60° or 90° for each muscle. The sum of difference, which represents the difference in RMS from the identical line, did not significantly differ in any of the assessed muscles in the present study. This suggests that a relatively smaller neuromuscular activation could be required when the elbow joint angle was extended. However, neuromuscular activation levels and relative force levels were matched in all three TB synergists when the elbow joint angle was at 90° or a more flexed position.
format	article
author	Hiroshi Akima Hisashi Maeda Teruhiko Koike Koji Ishida
author_facet	Hiroshi Akima Hisashi Maeda Teruhiko Koike Koji Ishida
author_sort	Hiroshi Akima
title	Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
title_short	Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
title_full	Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
title_fullStr	Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
title_full_unstemmed	Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
title_sort	effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/3a1389e7c7454f4a913232e31922c11a
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Effect of elbow joint angles on electromyographic activity versus force relationships of synergistic muscles of the triceps brachii.

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