Abstract
A platform was constructed which rolles 0 to 10 degrees in 0 to 0.6Hz of a sign wave pattern. A force plate was set on this platform, and the movement of the center of gravity of subjects standing on the platform was recorded on a stabilogram. Only a few subjects could keep standing at a roll of 5 degrees, so the level of 2.5 degrees of roll was chosen for further study. Frequency and correlation analysis were conducted focussing on the upper limit of the power spectrum and the phase shifts. Subjects results on both of these parameter changed at the critical level of 0.2Hz of roll. A study using this device was conducted on 100 normal subjects, 15 peripheral vestibular subjects (peripheral group), and 12 central nervous system disturbance subjects (CNS group). At a rolling of 2.5 degrees and 0.05Hz the CNS group could be differentiated from the vestibular and normal groups by the higher value of the upper limits of its power spectrums in frequency analysis and the earlier phase shift of its centers of gravity in correlation analysis. The results of the vestibular group did not differ from the results of the normal group in these parameters. In the unstability score, which is the author's own assessment system, the scores of the patients' groups were higher than those of the normal group. In conclusion, it is possible to distinguish CNS patients from peripheral vestibular patients and normal subjects by using this new technique of frequency and correlation analysis of rolling platform stabilograms. It appears that this technique may have clinical diagnostic value.
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