直立姿勢における踏み換え回数の測定

概要

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The peaks and nadirs of stabilogram waves are considered to be the turning points when the direction of body sway changes to the other side. We hypothesized that the number of turning points contributes to an increase of lengh in the statokinesigram. Using the method of pulse analysis, we counted the turning points and measured the amplitude of the pulses of 20 normal subjects, 20 patients with peripheral vertigo and 9 patients with central dysequilibrium. The normal number of turning points was: with eyes open, 31 to 36 in the lateral direction and 25 to 29 in the antero-posterior direction; with eyes closed, 33 to 39 times in the lateral direction and 29 to 34 in the antero-posterior direction. The normal amplitude was: with eyes open, 0.39 to 0.47 cm in the lateral direction and nearly the same in the antero-posterior direction; with eyes closed, 0.46 to 0.54 cm in the lateral direction and nearly the same in the antero-posterior direction. The number of turning points and the amplitude correlated well with the length. Therefore, both indices are considered to be functions of the length. Three of the peripheral patients with vertigo had a high number of turning points in relation to the statokinesigram results, suggesting some patients have a hyperactive postural reflex.