Title
Electromyographical manifestations of muscle fatigue during different levels of simulated light manual assembly work
Author
Bosch, T.
de Looze, M.P.
Kingma, I.
Visser, B.
van Dieën, J.H.
TNO Kwaliteit van Leven
Publication year
2009
Abstract
The purpose of this study was to determine whether objective electromyographical manifestations of muscle fatigue develop in the upper trapezius muscle in two assembly tasks involving contractions of different low-intensity levels (8% and 12% MVC) and whether these indications of fatigue are homogeneously distributed across different muscle parts. Ten subjects performed an assembly task for 3 h. EMG was recorded using four pairs of bipolar electrodes over the left and right trapezius muscles during the task itself and during isometric test contractions. Both recordings (during task and test) showed a significant decrease in the mean power frequency (MPF), at both intensity levels while the amplitude remained constant. A regression analysis showed significantly different temporal patterns for the MPF decrease for the two intensities. No differences in manifestations of muscle fatigue development were found between different parts of the muscle. These results indicate that in a highly repetitive low-intensity task, electromyographical manifestations of muscle fatigue can be observed from signals recorded in the task itself. Furthermore, the rate of development of fatigue manifestations was different between the two assembly tasks. This fatigue development appeared to be homogenous across the muscle. © 2008 Elsevier Ltd. All rights reserved.
Subject
Ergonomics
Arbeidsproductiviteit
Electromyography
Light manual work
Multiple electrodes
Muscle fatigue
Trapezius muscle
Electromyography
Manual labor
Motor performance
Muscle function
Muscle isometric contraction
Adult
Female
Humans
Male
Muscle Contraction
Muscle Fatigue
Physical Exertion
Shoulder Joint
Work
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DOI
https://doi.org/10.1016/j.jelekin.2008.04.014
TNO identifier
241671
ISSN
1050-6411
Source
Journal of Electromyography and Kinesiology, 19 (4), e246-e256
Document type
article