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Assessment of time patterns of activity and rest in full-shift recordings of trapezius muscle activity - Effects of the data processing procedure

Veiersted, Kaj Bo ; Forsman, Mikael ; Hansson, Gert-Åke LU and Mathiassen, Svend Erik (2013) In Journal of Electromyography & Kinesiology 23(3). p.540-547
Abstract
The purpose of this paper was to compare the effects of different data reduction procedures on the values of variables characterizing the time pattern of trapezius muscle activity during full work shifts. Surface electromyography (EMG) of the right and left upper trapezius muscles were obtained from 40 young subjects in different occupations, mainly electricians, hairdressers and students. The target EMG variables were gap frequency, muscle rest, and the number and duration of episodes with sustained muscle activity (from 0.13 s to 30 min as minimum duration). These variables were derived from the EMG recordings using different Root Mean Square (RMS) windows (from 0.13 to 6.38 s), and discrimination levels between "activity" and "rest"... (More)
The purpose of this paper was to compare the effects of different data reduction procedures on the values of variables characterizing the time pattern of trapezius muscle activity during full work shifts. Surface electromyography (EMG) of the right and left upper trapezius muscles were obtained from 40 young subjects in different occupations, mainly electricians, hairdressers and students. The target EMG variables were gap frequency, muscle rest, and the number and duration of episodes with sustained muscle activity (from 0.13 s to 30 min as minimum duration). These variables were derived from the EMG recordings using different Root Mean Square (RMS) windows (from 0.13 to 6.38 s), and discrimination levels between "activity" and "rest" (0.5%, 1% and 2% of maximal EMG). The results give basis for practical suggestions for EMG analyses of full work shifts. For most variables, a discrimination level of 0.5% EMG(max) showed to be preferable. The time proportion of muscle rest and sustained muscle activity should, in general, be preferred over the corresponding frequency measures. Sustained muscle activity should be calculated using a RMS window between 1 and 3 s, and preferably be stated in terms of variables describing time proportions of activity. Uninterrupted activity episodes longer than 10 min proved not to be a useful variable due to limited occurrence in many work shifts. (C) 2013 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electromyography, Muscle activity, Data processing, Exposure, Time, variation
in
Journal of Electromyography & Kinesiology
volume
23
issue
3
pages
540 - 547
publisher
Elsevier
external identifiers
  • wos:000318905600003
  • scopus:84876976445
  • pmid:23375714
ISSN
1873-5711
DOI
10.1016/j.jelekin.2012.12.004
language
English
LU publication?
yes
id
e7c161f1-6cc4-4ede-9952-bc1cf1af6333 (old id 3932513)
date added to LUP
2016-04-01 10:14:23
date last changed
2020-02-12 01:54:53
@article{e7c161f1-6cc4-4ede-9952-bc1cf1af6333,
  abstract     = {The purpose of this paper was to compare the effects of different data reduction procedures on the values of variables characterizing the time pattern of trapezius muscle activity during full work shifts. Surface electromyography (EMG) of the right and left upper trapezius muscles were obtained from 40 young subjects in different occupations, mainly electricians, hairdressers and students. The target EMG variables were gap frequency, muscle rest, and the number and duration of episodes with sustained muscle activity (from 0.13 s to 30 min as minimum duration). These variables were derived from the EMG recordings using different Root Mean Square (RMS) windows (from 0.13 to 6.38 s), and discrimination levels between "activity" and "rest" (0.5%, 1% and 2% of maximal EMG). The results give basis for practical suggestions for EMG analyses of full work shifts. For most variables, a discrimination level of 0.5% EMG(max) showed to be preferable. The time proportion of muscle rest and sustained muscle activity should, in general, be preferred over the corresponding frequency measures. Sustained muscle activity should be calculated using a RMS window between 1 and 3 s, and preferably be stated in terms of variables describing time proportions of activity. Uninterrupted activity episodes longer than 10 min proved not to be a useful variable due to limited occurrence in many work shifts. (C) 2013 Elsevier Ltd. All rights reserved.},
  author       = {Veiersted, Kaj Bo and Forsman, Mikael and Hansson, Gert-Åke and Mathiassen, Svend Erik},
  issn         = {1873-5711},
  language     = {eng},
  number       = {3},
  pages        = {540--547},
  publisher    = {Elsevier},
  series       = {Journal of Electromyography & Kinesiology},
  title        = {Assessment of time patterns of activity and rest in full-shift recordings of trapezius muscle activity - Effects of the data processing procedure},
  url          = {http://dx.doi.org/10.1016/j.jelekin.2012.12.004},
  doi          = {10.1016/j.jelekin.2012.12.004},
  volume       = {23},
  year         = {2013},
}