title: Correlations between short-time Fourier- and continuous wavelet transforms in the analysis of localized back and hip muscle fatigue during isometric contractions.
abstract: The aims of the current study were to examine the stationarities of surface electromyographic (EMG) signals obtained from eight bilateral back and hip muscles during a modified Biering-Sørensen test, and to investigate whether short-time Fourier (STFT) and continuous wavelet transforms (CWT) provided similar information with regard to EMG spectral parameters in the analysis of localized muscle fatigue. Twenty healthy subjects participated in the study after giving their informed consent. Reverse arrangement tests showed that 91.6% of the EMG signal epochs demonstrated no significant trends (all p>0.05), meaning 91.6% of the EMG signal epochs could be considered as stationary signals. Pearson correlation coefficients showed that STFT and CWT in general provide similar information with respect to the EMG spectral variables during isometric back extensions, and as a consequence STFT can still be used.
authors.affiliation: Department of Medical Informatics and Statistics, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium. Pascal.Coorevits@pandora.be
authors.forename: Pascal
authors.initials: P
authors.lastname: Coorevits
authors.forename: Lieven
authors.initials: L
authors.lastname: Danneels
authors.forename: Dirk
authors.initials: D
authors.lastname: Cambier
authors.forename: Herman
authors.initials: H
authors.lastname: Ramon
authors.forename: Hans
authors.initials: H
authors.lastname: Druyts
authors.forename: J
authors.initials: J
authors.lastname: Stefan Karlsson
authors.forename: Georges De
authors.initials: GD
authors.lastname: Moor
authors.forename: Guy
authors.initials: G
authors.lastname: Vanderstraeten
mesh_terms: D000328:Adult; D001415:Back / Q000502:physiology*; D004576:Electromyography; D005260:Female; D005583:Fourier Analysis; D006615:Hip / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*