基于SD方法的老年人平衡控制机理分析  

Analyses of elderly people's balance control mechanism using the stabilogram-diffusion method

作　　者：吴方芳[1] 蔡付文[1] 王人成[1] 金德闻[1] 张济川[1] 王广志[2] 

机构地区：[1]清华大学摩擦学国家重点实验室,智能与生物机械分室,北京100084 [2]清华大学医学院,生物医学工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第5期800-803,共4页Journal of Tsinghua University(Science and Technology)

基　　金：中国博士后科学基金资助项目(20060390480);教育部留学回国人员科研启动基金资助项目;国家自然科学基金重点项目(30630022)

摘　　要：该文用平衡控制机理研究年龄增长对人体平衡控制能力的影响。利用三维运动跟踪系统对6名老年人及8名年轻人进行了平衡测试,根据SD(stabilogram-diffusion)分析方法,讨论老年人和年轻人平衡控制机理的差异。结果显示:老年受试者在开环控制体现更多不稳定性,闭环控制反馈控制活动明显延迟;与年轻受试者相比,老年受试者6个评估参数(短时间间隔扩散系数,长时间间隔扩散系数,短时间间隔Hurst指数,长时间间隔Hurst指数,开、闭环控制临界点时间间隔及位移变化均方差)值均有所增加,其中有3个参量(短时间间隔扩散系数,开、闭环控制临界点时间及位移变化均方差)具有显著性差异。The balance control mechanisms of elderly people were compared with those of young people using the stabilogram-diffusion method to investigate the effects of aging on the balance control. Tests were made with 6 healthy elderly and 8 healthy young volunteers using a 3-D motion capture system. The results show that in elderly people the steady-state behavior with open-loop postural control mechanism is more unstable and that the closed-loop postural control has a longer delay for elderly people. All the parameters of elderly people, including the short-term and long-term diffusion coefficients, short-term and long-term Hurst exponents, critical time interval, and critical mean square displacement, are larger than those of the young volunteers, with the largest differences in the short-term diffusion coefficients, critical time intervals, and critical mean square displacements.

关 键 词：平衡控制 稳定性 开环控制 闭环控制 

分 类 号：Q811.211[生物学—生物工程] Q811.3