Affordable Access

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

Authors
  • Hussain, Jawad1
  • Sundaraj, Kenneth1
  • Subramaniam, Indra Devi2
  • Lam, Chee Kiang3
  • 1 Centre for Telecommunication Research & Innovation, Fakulti Kejuruteraan Elektronik & Kejuruteraan Komputer, Universiti Teknikal Malaysia Melaka, Malaysia. , (Malaysia)
  • 2 Centre for Technopreneurship Development, Pusat Bahasa & Pembangunan Insan, Universiti Teknikal Malaysia Melaka, Malaysia. , (Malaysia)
  • 3 School of Mechatronic Engineering, Universiti Malaysia Perlis, Malaysia. , (Malaysia)
Type
Published Article
Journal
Journal of musculoskeletal & neuronal interactions
Publication Date
Sep 01, 2019
Volume
19
Issue
3
Pages
276–285
Identifiers
PMID: 31475934
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

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). 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. 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. 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.

Report this publication

Statistics

Seen <100 times