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EMG spectral analysis of incremental exercise in cyclists and non-cyclists using Fourier and Wavelet transforms = Análise espectral do sinal emg de exercício incremental em ciclistas e não ciclistas usando as transformadas de Fourier e Wavelet

Vitor-Costa Marcelo, Bortolotti Henrique, Camata Thiago V., Cardoso Jefferson R., da Silva Rubens Alexandre, Abrão Taufik, de Moraes Antonio C. et Altimari Leandro R.. (2012). EMG spectral analysis of incremental exercise in cyclists and non-cyclists using Fourier and Wavelet transforms = Análise espectral do sinal emg de exercício incremental em ciclistas e não ciclistas usando as transformadas de Fourier e Wavelet. Brazilian journal of kinanthropometry and human performance, 14, (6), p. 660-670.

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URL officielle: http://dx.doi.org/doi:10.5007/1980-0037.2012v14n6p...

Résumé

The aim of this study was to compare the electromyographic indices of fatigue (slope of median frequency) calculated with the fast Fourier transform (FFT) and wavelet transform (WT) in trained and untrained individuals during cycle exercise. A second objective was to compare the variance of the spectral parameters (median frequency - MF) obtained by the FFT and WT during exercise. Twelve cyclists and non-cyclists performed a maximal incremental test to determine the peak power (Wp) and electromyographic activity of the vastus lateralis (VL), rectus femoris (RF), biceps femoris (BF), semitendinous (ST) and tibialis anterior (TA). Mean values of median frequency, determined by the FFT and WT, were used for the spectral analysis of the electromyographic signals of the studied muscles. The analyzed parameters were obtained for each time period corresponding to 0, 25, 50, 75, and 100% of total duration of the maximal incremental test. No statistically significant differences were found in the values of MF and electromyographic indices of fatigue between the two techniques (FT and WT) both in the cyclists and non-cyclists group (P>0.05). Regarding the MF variance, statistically significant differences were found in all analyzed muscles, as well as in different time periods, both in the cyclists and non-cyclists groups when comparing the FFT and WT techniques (P<0.05). The WT seems to be more adequate to dynamic tasks, since it does not require the signal to be quasi-stationary, unlike the limitation imposed upon the use of the FFT.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:14
Numéro:6
Pages:p. 660-670
Version évaluée par les pairs:Oui
Date:2012
Sujets:Sciences de la santé
Sciences de la santé > Sciences de l'activité physique et réadaptation
Sciences de la santé > Sciences de l'activité physique et réadaptation > Physiothérapie
Département, module, service et unité de recherche:Départements et modules > Département des sciences de la santé > Unité d'enseignement en physiothérapie
Mots-clés:electromyography, exercise test, muscle fatigue, spectral analysis, électromyographie, épreuve d'effort, fatigue musculaire, analyse spectrale.
Déposé le:03 oct. 2017 17:37
Dernière modification:03 oct. 2017 17:37
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