温度刺激下における重心動揺の周波数分析 : 重心の偏倚と動揺の分離

概要

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To clarify the influence of vestibular stimulation on upright standing, we analyze postural changes during caloric stimulation with cold water (20°C, 10°C, and 0°C). The power spectra of body sway were computed by a fast Fourier transform program. A relative decrease of frequency amplitude from 0.05-0.2Hz was observed in the X and 0.05-0.15Hz in the Y axis component. The presence of a frequency of about 0.3Hz was manifest in the X and of 0.2Hz in the Y axis component. When the stimulus was increased, the initial peak of the spectrum spread to the 0.3-0.5Hz band in the X and to the 0.2-0.5Hz band in the Y axis component. From these results, we concluded that postural changes during caloric stimulation have two components, postural deviation and body sway, and the transitional band is about 0.1-0.2Hz. We picked out a slow wave (less than 0.15Hz) from the linear stabilogram with a digital filter using a microcomputer. It seems that the neuronal mechanism of postural deviation and body sway are not the same.