The directional asymmetry of VOKN obviously exisists in upright subjects. Significant differences of the up-down asymmetry of VOKN among the Iow tolerance group were observed(P<0.05).
坐位状态VOKN慢相速度有明显的方向性不对称，敏感组VOKN方向性不对称有显著差异（P＜0．05）。
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