迷路性直立制御の解析 : 5次元フィードバックモデルによる
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概要
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To clarify the features of labyrinthine equilibrium disturbances, body sway in the upright standing posture was studied by a time series analysis with a 5-dimensional feedback model.<BR>Sways of the head, shoulder and hip and activities of the nuchal and rural muscles during upright standing were recorded polygraphically and stored in the memory of a PDP-11 computer. Data processing with a 5-dimensional feedback model was performed in a specially designed program. The results were displayed on a cathode ray tube and teletype as determinant of noise correlation matrix, power spectrum, correlogram, transfer function (Bode plot) and relative power contribution.<BR>1. The determinant of noise correlation matrix on upright standing with eyes closed was 0.49 using linear movement of the head agdinst 0.73 using angular movement of the head. The vestibulo-spinal system has a good feedback when angular movement is used as head sway.<BR>2. Power spectrum and correlogram of head movement indicated that head movement was a slow irregular sway with marked decrease of power in a frequency exceeding 1 Hz. The results indicate that the vestibulo-spinal system controls body sway of low frequency.<BR>3. The transfer function calculated with head movements as input and the nuchal muscle activities as output indicated an increase of the gain in the frequency range from 0.02 to 1 Hz. The gain obtained from the sural muscle activities as output was flat. These features of the Bode plots suggest the dynamic characteristics of the vestibulo-spinal reflex. However, more than half of the subjects showed different features in their Bode plots.<BR>4. In the relative power contribution, the proportion induced by the head movement in the autopower spectra of the nuchal and sural muscle was from 1% to 14% in the frequency range from 0.2 to 1 Hz.<BR>The vestibulo-spinal system regulates body sways of low frequency during upright standing. However, the proportion of the contribution of the vestibulospinal system is low in the whole control of standing posture.
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