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Gender differences in spectral and entropic measures of erector spinae muscle fatigue

Authors
Sung, Paul S.Zurcher, UlrichKaufman, Miron
Issue Date
2008
Publisher
JOURNAL REHAB RES & DEV
Keywords
electromyography; entropy; erector spinae; fatigability; gender; low back pain; median frequency; muscle fatigue; nonlinear time series; rehabilitation
Citation
JOURNAL OF REHABILITATION RESEARCH AND DEVELOPMENT, v.45, no.9, pp.1431 - 1439
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF REHABILITATION RESEARCH AND DEVELOPMENT
Volume
45
Number
9
Start Page
1431
End Page
1439
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/125506
DOI
10.1682/JRRD.2007.11.0196
ISSN
0748-7711
Abstract
Electromyographic power spectral analysis is a valuable measurement; however, conflicting results have been reported for amplitude and frequency changes during a fatiguing submaximal Muscle contraction. This study compared gender differences for two analyses in subjects with low back pain (LBP). Distinct gender differences are found ill musculoskeletal illness/dysfunction, and we examined the effect of gender on entropy and median frequency (MF) slope in a cohort of subjects with LBP. A total of 44 subjects (24 female and 20 male) completed the modified Sorenson test. These Subjects ranged in age from 26 to 64 years old, with all average age of 49.9 +/- 9.4 years. Overall, a significant fatigability difference was found based oil MF slope (F = 21.33, p = 0.001) and entropy measures (F = 68.26, p = 0.001) of the back muscles. While the MF slope was not different (F = 0.44, p = 0.51) between genders, the entropy values were higher for the male subjects than for the female subjects (F = 6.70, p = 0.01). These results indicate that the Shannon entropy measure differentiates between genders. Further studies are needed to evaluate the effectiveness of using nonlinear analysis as a measurement tool.
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