EMG spectral analysis of incremental exercise in cyclists and non-cyclists using Fourier and Wavelet transforms. http://dx.doi.org/10.5007/1980-0037.2012v14n6p660

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 spec...

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Published in:Revista brasileira de cineantropometria & desempenho humano 2012-11, Vol.14 (6), p.660-670
Main Authors: Marcelo Vitor da Costa, Henrique Bortolotti, Thiago Viana Camata, Jefferson Rosa Cardoso, Rubens da Silva, Taufik Abrão, Antonio Moraes, Leandro Altimari
Format: Article
Language:English
Subjects:
Electromyography
eletromiografia
Exercise test
Fadiga
Muscle fatigue
Spectral analysis
Transformada de Fourier
Transformada wavelet
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Summary: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
ISSN:1415-8426
1980-0037