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Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels

OBJECTIVE: The objective of this study was to investigate fatigue in the three heads of the triceps brachii (TB) muscle using surface electromyography (sEMG) obtained at 30%, 45% and 60% of maximal voluntary contraction (MVC). METHODS: Twenty-five subjects performed isometric elbow extension until f...

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Autores principales: Hussain, Jawad, Sundaraj, Kenneth, Subramaniam, Indra Devi, Lam, Chee Kiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Society of Musculoskeletal and Neuronal Interactions 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6737551/
https://www.ncbi.nlm.nih.gov/pubmed/31475934
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author Hussain, Jawad
Sundaraj, Kenneth
Subramaniam, Indra Devi
Lam, Chee Kiang
author_facet Hussain, Jawad
Sundaraj, Kenneth
Subramaniam, Indra Devi
Lam, Chee Kiang
author_sort Hussain, Jawad
collection PubMed
description OBJECTIVE: The objective of this study was to investigate fatigue in the three heads of the triceps brachii (TB) muscle using surface electromyography (sEMG) obtained at 30%, 45% and 60% of maximal voluntary contraction (MVC). METHODS: Twenty-five subjects performed isometric elbow extension until failure, and the rate of fatigue (ROF), time to fatigue (TTF) and normalized TTF (NTTF) were statistically analysed. Subsequently, the behaviour of root-mean-square (RMS), mean-power frequency (MPF) and median-power frequency (MDF) under pre-, onset- and post-fatigue conditions were compared. RESULTS: The findings indicated that, among the heads, ROF was statistically significant at 30% and 45% MVC (P<0.05) but TTF and NTTF at all intensities was statistically insignificant (P>0.05). For every head, only TTF was statistically significant (P<0.05) at different intensities. MPF and MDF under pre-, onset- and post-fatigue conditions were statistically significant (P<0.05) among the heads at all intensities, whereas RMS showed no such behaviour. CONCLUSION: The investigated parameters reveal that the three heads of TB act independently before fatigue onset and appear to work in union after fatigue. Synergist head pairs exhibit similar spectral and temporal behaviour in contrast to the non-synergist TB head pair. We find spectral parameters to be more specific predictors of fatigue.
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spelling pubmed-67375512019-09-16 Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels Hussain, Jawad Sundaraj, Kenneth Subramaniam, Indra Devi Lam, Chee Kiang J Musculoskelet Neuronal Interact Original Article OBJECTIVE: The objective of this study was to investigate fatigue in the three heads of the triceps brachii (TB) muscle using surface electromyography (sEMG) obtained at 30%, 45% and 60% of maximal voluntary contraction (MVC). METHODS: Twenty-five subjects performed isometric elbow extension until failure, and the rate of fatigue (ROF), time to fatigue (TTF) and normalized TTF (NTTF) were statistically analysed. Subsequently, the behaviour of root-mean-square (RMS), mean-power frequency (MPF) and median-power frequency (MDF) under pre-, onset- and post-fatigue conditions were compared. RESULTS: The findings indicated that, among the heads, ROF was statistically significant at 30% and 45% MVC (P<0.05) but TTF and NTTF at all intensities was statistically insignificant (P>0.05). For every head, only TTF was statistically significant (P<0.05) at different intensities. MPF and MDF under pre-, onset- and post-fatigue conditions were statistically significant (P<0.05) among the heads at all intensities, whereas RMS showed no such behaviour. CONCLUSION: The investigated parameters reveal that the three heads of TB act independently before fatigue onset and appear to work in union after fatigue. Synergist head pairs exhibit similar spectral and temporal behaviour in contrast to the non-synergist TB head pair. We find spectral parameters to be more specific predictors of fatigue. International Society of Musculoskeletal and Neuronal Interactions 2019 /pmc/articles/PMC6737551/ /pubmed/31475934 Text en Copyright: © Journal of Musculoskeletal and Neuronal Interactions http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 4.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Hussain, Jawad
Sundaraj, Kenneth
Subramaniam, Indra Devi
Lam, Chee Kiang
Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
title Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
title_full Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
title_fullStr Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
title_full_unstemmed Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
title_short Analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
title_sort analysis of fatigue in the three heads of the triceps brachii during isometric contractions at various effort levels
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6737551/
https://www.ncbi.nlm.nih.gov/pubmed/31475934
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