Johansson R, Magnusson M, Fransson P A
Department of Oto-Rhino-Laryngology, Lund University Hospital, Sweden.
IEEE Trans Biomed Eng. 1995 Mar;42(3):282-92. doi: 10.1109/10.364515.
Human postural dynamics was investigated in 12 normal subjects by means of a force platform recording body sway, induced by bipolar transmastoid galvanic stimulation of the vestibular nerve and labyrinth. The model adopted was that of an inverted segmented pendulum, the dynamics of postural control being assumed to be reflected in the stabilizing forces actuated by the feet as a result of complex muscular activity subject to state feedback of body sway and position. Time-series analysis demonstrates that a transfer function from stimulus to sway-force response with specific parameters can be identified. In addition, adaptation to the vestibular stimulus is demonstrated to exist, and we describe this phenomenon using quantification in terms of a postural adaptation time constant in the range of 40-50 s. The results suggest means to evaluate adaptive behavior and postural control in the erect human being which may be useful in the rehabilitation of individuals striving to regain upright stance.
通过力平台记录12名正常受试者的人体姿势动力学，该力平台用于记录由前庭神经和迷路的双极经乳突电刺激诱发的身体摆动。采用的模型是倒立分段摆模型，假设姿势控制的动力学反映在由于复杂肌肉活动而由足部产生的稳定力中，这种复杂肌肉活动受身体摆动和位置的状态反馈影响。时间序列分析表明，可以识别出具有特定参数的从刺激到摆动-力响应的传递函数。此外，已证明存在对前庭刺激的适应性，并且我们使用40-50秒范围内的姿势适应时间常数进行量化来描述这一现象。结果表明了评估直立人体适应性行为和姿势控制的方法，这可能有助于努力恢复直立姿势的个体的康复。
