抄録
Frequency analysis of the movement of the center of gravity during standing erect was investigated in this study. One hundred cases of both the peripheral vestibular disease and the central nervous system disturbance were examined. The following results were obtained.
1. Effects of visual righting reflex. In the peripheral vestibular disturbance, increase of waves between 0.5 and 3Hz or 1 and 4Hz in both the X (right and left direction) and the Y (foreward and backward direction) and relative decrease of waves of less than 0.5Hz appeared when the patients were asked to close their eyes. However, in the cases of central disturbances in the Y such a difference between with eyes open and with eyes closed was not observed, though in the X the result was similar as one in the peripheral vestibular disease.
2. Comparison between the ataxic patients and normal controls.
In the peripheral vestibular disease, increase of waves of less than 1Hz in the X, increase of waves between 0.5 and 1Hz in the Y with eyes open and increase of waves between 1 and 2Hz in the X with eyes closed were statistically confirmed. In the cases of Meniere's disease a result of increase of waves between 0.5 and 1Hz with eyes closed in the X was added. In the cases of central disturbances, the results in the X with eyes open and with eyes closed were same as the results of peripheral vestibular disease. However, lack of increase of waves between 0.5 and 1Hz in the Y with eyes open was observed.
Such a characteristic frequency wave form of the movement of the center of gravity in standing posture in the cases of different diseases may have the clinical diagnostic value.
