Koles Z J, Castelein R D
J Med Eng Technol. 1980 Nov;4(6):279-85. doi: 10.3109/03091908009161703.
The relationship between the movement of the centre of foot pressure in the anterio-posterior plane and the rotation which occurs in the same plane at the level of the ankles, hips and shoulders during postural sway was examined in a group of normal human subjects. Expressed as three frequency-dependent functions this relationship consists of both relative magnitude and phase components. The magnitude component indicates that the pressure centre was most sensitive to ankle rotation, less to hip and least sensitive to rotation at the level of the shoulders. The sensitivity of the pressure centre was also a function of the frequency of the rotations and this is evidenced by the presence of several resonant peaks in the relationship. It is suggested that these could be due to body inertia and transmission delays. The resonant peaks became more prominent when the subjects stood with eyes closed. The growth of resonant peaks is taken as a sign of reduced postural stability and on this basis it is argued that a distinction should probably be made between the concepts of the stability and the steadiness of stance.
在一组正常人体受试者中，研究了姿势摆动期间足压中心在前后平面内的移动与在脚踝、臀部和肩部水平同一平面内发生的旋转之间的关系。这种关系以三个频率相关函数表示，包括相对大小和相位分量。大小分量表明压力中心对踝关节旋转最敏感，对髋关节旋转较不敏感，对肩部水平的旋转最不敏感。压力中心的敏感性也是旋转频率的函数，这一点由该关系中几个共振峰的存在得到证明。有人认为，这些可能是由于身体惯性和传输延迟造成的。当受试者闭眼站立时，共振峰变得更加明显。共振峰的增加被视为姿势稳定性降低的标志，在此基础上有人认为，可能应该在姿势稳定性和站姿平稳性的概念之间做出区分。
