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Please use this identifier to cite or link to this item: http://ir.jwcpe.ac.jp/dspace/handle/123456789/544

Title: 持続的筋力発揮における単極表面筋電位周波数構成の変化
Other Titles: Frequency components of monopolarily recorded surface electromyograms during low-level sustained contraction
Authors: 加茂, 美冬
Kamo, Mifuyu
カモ, ミフユ
Keywords: Sustained contraction
Surface electromyogram
Monopolar recording
Amplitude spectrum
Motor unit
Issue Date: Mar-2004
Abstract: A change in the frequency components of monopolarliy recorded surface electromyograms in m. vastus medialis was observed during sustained isometric contraction at 5% MVC (maximal voluntary contraction: MVC) for 15 min. Fast Fourier Transform was applied to monopolarily recorded surface EMG to obtain the turning frequency (TF) in amplitude spectrum at which the signals divide into high and low frequency components (HFC, LFC). Then HFC and LFC contents in the amplitude spectrum were calculated. 1) The integrated value of the EMG (IEMG) remained constant for the first 3 min, and then increase dgradually. 2) The content of frequency components did not change until 7 min, although in this period, TF was lower than the initial value. 3) The LFC gradually increased after 7 min. A distinct peak at 11-15 Hz in the amplitude spectrum appeared in the LFC distribution after 8-13 min. It is necessary further detailed investigations on the frequency characteristics of the LFC and HFC to understand the change of TF at the first period at which the content of the frequency components was stable during low-level sustained contraction. The increase of LFC content could be explained by synchronization and grouping discharge among motor units during the contraction.
URI: http://ir.jwcpe.ac.jp/dspace/handle/123456789/544
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