Medial-lateral postural control in older adults exhibits increased stiffness and damping.
Medial-lateral postural control in older adults exhibits increased stiffness and damping.
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DOI：
10.1109/iembs.2009.5333838
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Redfern MS
中科院分区：
文献类型：
--
作者：
Cenciarini M;Loughlin PJ;Sparto PJ;Redfern MS
老年人通常会因平衡扰动而表现出更强的共同收缩。人们普遍认为这种反应可以通过增加关节刚度来增强稳定性。我们通过将 7 名老年人（75 ± 5 岁）和 10 名年轻人（24 ± 3 岁）置于伪随机内侧-外侧 (ML) 地板倾斜中，然后将测得的 ML 身体摇摆数据拟合到先前开发的包括刚度和阻尼参数的姿势控制模型中，研究了姿势控制中刚度增加的问题。与年轻人相比，老年人的这两个参数均显着增加。刚度和阻尼的同时增加比单独增加刚度更稳定，后者可能导致共振。
Older adults often exhibit increased co-contraction in response to a balance perturbation. This response is generally thought to enhance stability by increasing joint stiffness. We investigated the issue of increased stiffness in postural control by exposing seven older (75 ±5 y) and ten young (24 ± 3 y) adults to pseudo-random medial-lateral (ML) floor tilts, and then fitting the measured ML body sway data to a previously-developed postural control model that includes stiffness and damping parameters. Significant increases were found in both parameters in the older adults compared to the young adults. This concurrent increase in stiffness and damping is more stabilizing than an increase in stiffness alone, which can lead to resonances.