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Test-retest reliability of wavelet- and Fourier based EMG (instantaneous) median frequencies in the evaluation of back and hip muscle fatigue during isometric back extensions

Pascal Coorevits UGent, Lieven Danneels UGent, Dirk Cambier UGent, Herman Ramon, Hans Druyts, Stefan J Karlsson, Georges De Moor UGent and Guy Vanderstraeten UGent (2008) Journal of electromyography and kinesiology. 18(5). p.798-806
abstract
The present study aimed at assessing the test-retest reliability of wavelet - and Fourier derived (instantaneous) median frequencies of surface electromyographic (EMG) measurements of back and hip muscles during isometric back extensions. Twenty healthy subjects (10 males and 10 females) performed a modified Biering-Sorensen test on two separate days, with a 1-week interval between the two tests. Surface EMG measurements were bilaterally performed from the latissimus dorsi, the thoracic and lumbar parts of the longissimus thoracis, the thoracic and lumbar parts of the iliocostalis lumborum, the multifidus, the gluteus maximus and the biceps femoris. In addition, three-dimensional kinematic data were recorded of the subjects' lumbar vertebrae. The (instantaneous) median frequencies were calculated from the EMG signals using continuous wavelet (IMDF) - and short-time Fourier transforms (MDF). Linear regressions performed on the IMDF and MDF data as a function of time yielded slopes (IMDFslope and MDFslope) and intercepts (IMDFinit and MDFinit) of the regression lines. Test-retest reliability was assessed on the normalized slopes and intercept parameters by means of intra-class correlation coefficients (ICC) and standard errors of measurements expressed as percentages of the mean values (% SEM). The results of IMDFslope MDFslope parameters indicated ICCs for back and hip muscles between .443 and .727 for IMDFslope values between .273 and .734 for MDFslope, % SEM between 7.6% and 58.9% for IMDFslope and % SEM between 8.2% and 25.3% for MDFslope, respectively. The ICCs for IMDFinit and MDFinit parameters varied between .376 and .907 for IMDFinit and between .383 and .883 for MDFinit, and % SEM ranged from 2.7% to 6.3% for IMDFinit, and from 2.6% to 4.7% for MDFinit, respectively. These results indicate that both wavelet - and Fourier based (instantaneous) median frequency parameters generally are reliable in the analysis of back and hip muscle fatigue during a modified Biering-Sorensen test.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
journal title
Journal of electromyography and kinesiology
J. Electromyogr. Kinesiol.
volume
18
issue
5
pages
798 - 806
Web of Science type
Article
Web of Science id
000259905400011
JCR category
SPORT SCIENCES
JCR impact factor
1.884 (2008)
JCR rank
18/71 (2008)
JCR quartile
2 (2008)
ISSN
1050-6411
DOI
10.1016/j.jelekin.2007.01.007
language
English
UGent publication?
yes
classification
A1
id
517489
handle
http://hdl.handle.net/1854/LU-517489
date created
2009-03-12 10:58:58
date last changed
2009-03-17 12:10:57
@article{517489,
  abstract     = {The present study aimed at assessing the test-retest reliability of wavelet - and Fourier derived (instantaneous) median frequencies of surface electromyographic (EMG) measurements of back and hip muscles during isometric back extensions. Twenty healthy subjects (10 males and 10 females) performed a modified Biering-Sorensen test on two separate days, with a 1-week interval between the two tests. Surface EMG measurements were bilaterally performed from the latissimus dorsi, the thoracic and lumbar parts of the longissimus thoracis, the thoracic and lumbar parts of the iliocostalis lumborum, the multifidus, the gluteus maximus and the biceps femoris. In addition, three-dimensional kinematic data were recorded of the subjects' lumbar vertebrae. The (instantaneous) median frequencies were calculated from the EMG signals using continuous wavelet (IMDF) - and short-time Fourier transforms (MDF). Linear regressions performed on the IMDF and MDF data as a function of time yielded slopes (IMDFslope and MDFslope) and intercepts (IMDFinit and MDFinit) of the regression lines. Test-retest reliability was assessed on the normalized slopes and intercept parameters by means of intra-class correlation coefficients (ICC) and standard errors of measurements expressed as percentages of the mean values (\% SEM). The results of IMDFslope MDFslope parameters indicated ICCs for back and hip muscles between .443 and .727 for IMDFslope values between .273 and .734 for MDFslope, \% SEM between 7.6\% and 58.9\% for IMDFslope and \% SEM between 8.2\% and 25.3\% for MDFslope, respectively. The ICCs for IMDFinit and MDFinit parameters varied between .376 and .907 for IMDFinit and between .383 and .883 for MDFinit, and \% SEM ranged from 2.7\% to 6.3\% for IMDFinit, and from 2.6\% to 4.7\% for MDFinit, respectively. These results indicate that both wavelet - and Fourier based (instantaneous) median frequency parameters generally are reliable in the analysis of back and hip muscle fatigue during a modified Biering-Sorensen test.},
  author       = {Coorevits, Pascal and Danneels, Lieven and Cambier, Dirk and Ramon, Herman and Druyts, Hans and Karlsson, Stefan J and De Moor, Georges and Vanderstraeten, Guy},
  issn         = {1050-6411},
  journal      = {Journal of electromyography and kinesiology},
  language     = {eng},
  number       = {5},
  pages        = {798--806},
  title        = {Test-retest reliability of wavelet- and Fourier based EMG (instantaneous) median frequencies in the evaluation of back and hip muscle fatigue during isometric back extensions},
  url          = {http://dx.doi.org/10.1016/j.jelekin.2007.01.007},
  volume       = {18},
  year         = {2008},
}

Chicago
Coorevits, Pascal, Lieven Danneels, Dirk Cambier, Herman Ramon, Hans Druyts, Stefan J Karlsson, Georges De Moor, and Guy Vanderstraeten. 2008. “Test-retest Reliability of Wavelet- and Fourier Based EMG (instantaneous) Median Frequencies in the Evaluation of Back and Hip Muscle Fatigue During Isometric Back Extensions.” Journal of Electromyography and Kinesiology 18 (5): 798–806.
APA
Coorevits, P., Danneels, L., Cambier, D., Ramon, H., Druyts, H., Karlsson, S. J., De Moor, G., et al. (2008). Test-retest reliability of wavelet- and Fourier based EMG (instantaneous) median frequencies in the evaluation of back and hip muscle fatigue during isometric back extensions. Journal of electromyography and kinesiology, 18(5), 798–806.
Vancouver
1.
Coorevits P, Danneels L, Cambier D, Ramon H, Druyts H, Karlsson SJ, et al. Test-retest reliability of wavelet- and Fourier based EMG (instantaneous) median frequencies in the evaluation of back and hip muscle fatigue during isometric back extensions. Journal of electromyography and kinesiology. 2008;18(5):798–806.
MLA
Coorevits, Pascal, Lieven Danneels, Dirk Cambier, et al. “Test-retest Reliability of Wavelet- and Fourier Based EMG (instantaneous) Median Frequencies in the Evaluation of Back and Hip Muscle Fatigue During Isometric Back Extensions.” Journal of electromyography and kinesiology 18.5 (2008): 798–806. Print.