Analysis of Colonic Motility by Fast Fourier Transform.

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  • TAKEKAWA Satoru
    The First Department of Surgery, Juntendo University School of Medicine

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  • 高速フーリエ変換 (Fast Fourier Transform: FFT) による大腸運動の解析

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Colonic motility curve was continuously recorded in dog using a strain gauge force transducer and the curve was analyzed by fast Fourier transform.<BR>(1) The basic pattern of the colonic motility curve was a gradually increasing and decreasing contractile wave.<BR>(2) The frequency components of the basic contractile wave showed a trimodal distribution with peaks at around 1, 20 and 80mHz.<BR>(3) The 1mHz component showed a sine curve and represented the slow, big motion in the basic contractile wave.<BR>(4) The 20mHz component represented the relatively rapid, gradually increasing and decreasing, big motion in the basic contractile wave.<BR>(5) The 80mHz component represented the rapid, small motion in the basic contractile wave.<BR>(6) The fundamental frequency components of the colonic contractile wave were unchanged before and after defecation.<BR>(7) For the antiperistaltic wave which disappeared during transmission, the peaks of the wavelength components weakened during transmission and the wave progressed to a multi-modal curve.<BR>Our findings indicate that fast Fourier transform is an extremely useful method in elucidating colonic motility.

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