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目的:探讨直立姿势控制中足压中心(COP)和头部动摇的区别和联系。方法:11名健康成年被试(7男4女,年龄28.0±5.6岁,身高1.68±0.09m)分别在闭眼和睁眼条件下各保持直立姿势1分钟。分别用测力台和数码摄像机同步记录被试在直立姿势状态下的COP和头部动摇轨迹。选用误差均方根(RMS)、平均速度(MV)和平均功率频率(MPF)作为评价COP和头部动摇的指标。结果:在RMS指标上COP与头部动摇之间有很高的相关性(r=0.75~0.97,P<0.01),但在MV和MPF这两个指标上,两者相关性较低。头部动摇MV的Romberg商数显著大于COP。结果提示头部测定法和COP法不能互相取代。在研究视觉对直立姿势控制的影响时,头部测定法比COP法更有效。
Objective: To investigate the difference and relationship between the foot pressure center (COP) and head sway in upright posture control. Methods: Eleven healthy adult subjects (7 males and 4 females, mean age 28.0 ± 5.6 years, height 1.68 ± 0.09m) were kept in an upright posture for 1 minute under closed eyes and open eyes, respectively. Simultaneous recording of the COP and head shake trajectory of the subjects in the upright posture was carried out by using a dynamometer and a digital video camera, respectively. Error root mean square (RMS), mean velocity (MV), and mean power frequency (MPF) were used as indices to evaluate COP and head dilation. Results: There was a high correlation between COP and head dyssynchrony (r = 0.75-0.97, P <0.01) on the RMS index, but the correlation between COP and MPF was low on the two indicators. The Romberg quotient of head-minded MVs is significantly larger than COP. The results suggest that the head assay and COP method can not replace each other. The head assay is more effective than the COP method in studying the effect of vision on upright posture control.