Shepard N T, Schultz A, Alexander N B, Gu M J, Boismier T
Department of Otolaryngology, University of Michigan, Ann Arbor.
Ann Otol Rhinol Laryngol. 1993 Jul;102(7):508-17. doi: 10.1177/000348949310200704.
The use of dynamic posturography (EquiTest) for the characterization of postural control biomechanics would be aided by specific knowledge of what the measured data imply about body segment movements. To investigate this issue, the biomechanics of a group of 15 healthy elderly subjects were compared to those of healthy young subjects by using both dynamic posturography and a laboratory movement and force measuring system. The results from EquiTest were analyzed by 1) routine clinical interpretation of data and 2) a clinical research interpretation by subjecting the EquiTest parameters to additional statistical comparison of mean performance of the young and elderly groups. The young-elderly differences from the 2 EquiTest analyses were then compared to the young-elderly differences derived from the laboratory protocol. The routine clinical interpretation of EquiTest data identified the same increases in sway shown by the laboratory study, but did not reveal the more subtle differences indicated by the laboratory study. When the EquiTest data were subjected to additional statistical analysis, the characterization of difference between young and elderly subjects was the same as that of the laboratory study, with the exception of issues of head versus trunk movement, a measure not made by EquiTest. This essential similarity in the characterization of elderly compared to young subjects by both systems suggests 1) that EquiTest is able to detect subtle differences in biomechanics of postural control between young and elderly healthy adult groups and 2) that implied movements of center of gravity, trunk versus lower limbs, and strength of reaction measures are consistently detected by both EquiTest and the laboratory kinematics and dynamics measurement systems.
如果能够具体了解测量数据对于身体节段运动的意义，那么使用动态姿势描记法（EquiTest）来描述姿势控制生物力学将会得到很大帮助。为了研究这个问题，通过使用动态姿势描记法以及实验室运动和力测量系统，对一组15名健康老年人的生物力学与健康年轻人的生物力学进行了比较。EquiTest的结果通过以下两种方式进行分析：1）对数据进行常规临床解读；2）通过对EquiTest参数进行年轻组和老年组平均表现的额外统计比较，进行临床研究解读。然后将两种EquiTest分析得出的年轻与老年差异与实验室方案得出的年轻与老年差异进行比较。EquiTest数据的常规临床解读确定了实验室研究中显示的相同摇摆增加情况，但没有揭示实验室研究中指出的更细微差异。当对EquiTest数据进行额外统计分析时，除了EquiTest未进行测量的头部与躯干运动问题外，年轻与老年受试者之间差异的特征与实验室研究相同。两种系统对老年与年轻受试者特征的这种基本相似性表明：1）EquiTest能够检测出健康年轻和老年成年组之间姿势控制生物力学的细微差异；2）EquiTest和实验室运动学与动力学测量系统都能一致地检测出重心的隐含运动、躯干与下肢的运动以及反应测量的强度。
