Ankle muscle stiffness alone cannot stabilize balance during quiet standing
Ankle muscle stiffness alone cannot stabilize balance during quiet standing
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DOI：
10.1152/jn.2002.88.4.2157
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发表时间：
2002-10-01
影响因子：
2.5
通讯作者：
Sanguineti, V
中科院分区：
文献类型：
--
作者：
Morasso, PG;Sanguineti, V
这篇文章再次提出了一个假设，即安静站立时平衡的稳定是通过踝关节肌肉的僵硬来实现的，而没有预期的主动控制。结果表明，最近提出的方法估计踝关节刚度直接从姿势数据的分析是不正确的，因为它忽略了运动神经元活动的调制和严重高估的真实的范围内的值与刚度的临界值。此外，一项新的模拟研究利用脚踝肌肉的真实模型证明了在没有预期控制输入时系统的机械不稳定性。然而，模拟还表明，在正常受试者中，主动刚度稳定机制在确定防止身体摔倒所需的恢复力方面具有相似的权重。
This communication addresses again the hypothesis that the stabilization of balance during quiet standing is achieved by the stiffness of ankle muscles without anticipatory active control. It is shown that a recently proposed method of estimating ankle stiffness directly from the analysis of the posturographic data is incorrect because it ignores the modulation of motoneuronal activity and grossly overestimates the real range of values in relation with the critical value of stiffness. Moreover, a new simulation study with a realistic model of ankle muscles demonstrates the mechanical instability of the system when there is no anticipatory control input. However, the simulations also suggest that in normal subjects the active stiffness mechanisms of stabilization have similar weights in determining the restoring forces that are necessary for preventing the body from falling.