Comparison of Fourier and wavelet transform procedures for examining mechanomyographic and electromyographic frequency versus isokinetic torque relationships

Travis W. Beck, T. J. Housh, G. O. Johnson, J. P. Weir, J. T. Cramer, J. W. Coburn, M. H. Malek

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The purpose of this study was to compare the isokinetic torque-related patterns for mechanomyographic (MMG) and electromyographic (EMG) center frequency [wavelet center frequency (CF), mean power frequency (MPF), and median frequency (MDF)] determined by the fast Fourier transform (FFT) and discrete wavelet transform (DWT). Ten adults [mean ± SD age = 22.0 ± 3.4 yrs] performed submaximal to maximal, isokinetic muscle actions of the biceps brachii on a Cybex II dynamometer. For both MMG and EMG, the CF, MPF, and MDF values were intercorrelated at (r = 0.91-0.98). Quadratic models provided the best fit for the absolute and normalized CF, MPF, and MDF versus isokinetic torque relationships for MMG (R2 = 0.67-0.83) and EMG (R2 = 0.72-0.90). The similarities among the CF, MPF, and MDF patterns suggested that Fourier or wavelet transform procedures can be used to examine the patterns of MMG and EMG responses during dynamic muscle actions.

Original languageEnglish (US)
Pages (from-to)93-103
Number of pages11
JournalElectromyography and Clinical Neurophysiology
Volume45
Issue number2
StatePublished - Mar 2005

Keywords

  • Electromyography
  • Mechanomyography
  • Signal processing
  • Stationarity

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Physiology (medical)

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