視標追跡時におけるメニエール病患者の重心動揺

Abstract

We examined the effect of eye tracking stimulation on movement of the body's center of gravity (CG) in patients with Ménière's disease using a strain gauge platform and a minicomputer.1) Two types of locus pattern of the CG were observed while eye tracking: a left and right type in 7 subjects and a centripetal type in 5 subjects. In the centripetal type, the total length of movement of the CG while standing for one minute gradually increased with increasing traget speedsup to 0.5 Hz and then decreased at higher speeds. However, in the left and right type, therewas little change of movement of the CG at speeds above 0.75 Hz.2) On horizontal stimulation the Y/X ratio gradually decreased with increasing frequency of traget speeds up to 0.5 Hz. On vertical stimulation the ratio was above 1.0 at all traget speeds in the centripetal type, but was below 1.0, except at 0.25 Hz, in the left and right type.3) The frequency spectra obtained from CG movement while eye tracking changed in the range below 1.0 Hz and sometimes showed several peaks at around 0.2 Hz. The average spectral frequencies were calculated and some characteristic results were obtained, related to the types of the locus.