Does local dynamic stability during unperturbed walking predict the response to balance perturbations? An examination across age and falls history.
Does local dynamic stability during unperturbed walking predict the response to balance perturbations? An examination across age and falls history.
复制标题
不受干扰行走期间的局部动态稳定性是否可以预测对平衡扰动的响应？
DOI：
10.1016/j.gaitpost.2018.03.011
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发表时间：
2018
期刊：
影响因子：
2.4
通讯作者：
Franz,JasonR
中科院分区：
文献类型：
--
作者：
Qiao,Mu;Truong,KinhN;Franz,JasonR
背景老年人跌倒的风险特别高，大多数跌倒发生在步行等运动活动期间。老年人局部动态稳定性的降低通常被解释为应对行走过程中遇到的更严重的平衡挑战的能力下降以及未来跌倒的风险。然而，目前尚不清楚正常、不受干扰的行走过程中的局部动态稳定性是否可以预测对较大外部平衡干扰的反应。研究问题我们测试了这样的假设，即不受干扰的行走过程中局部动态不稳定性的较大值将与光流平衡扰动引起的较大变化呈正相关。方法我们使用了在有或没有中间侧光流扰动的情况下行走期间收集的一系列步行平衡完整性受试者的躯干运动学数据——年轻人、老年非跌倒者和老年跌倒者。结果我们首先发现证据表明，足够幅度的光流扰动似乎能够揭示衰老和跌倒历史的独立影响，而这些影响在正常、不受干扰的行走过程中并不明显。我们也拒绝我们的主要假设；仅在年轻人中存在显着负相关，表明在正常、不受干扰的行走过程中具有更多局部动态不稳定性的个体对光流扰动表现出较小的反应。相比之下，在老年跌倒者中最显着的是，对光流扰动的响应似乎独立于其动态不稳定性的基线水平。意义我们提出，预测老年跌倒者对平衡扰动的响应，至少是使用局部动态稳定性测量的响应，可能需要直接测量该响应。
BackgroundOlder adults are at an exceptionally high risk of falls, and most falls occur during locomotor activities such as walking. Reduced local dynamic stability in old age is often interpreted to suggest a lessened capacity to respond to more significant balance challenges encountered during walking and future falls risk. However, it remains unclear whether local dynamic stability during normal, unperturbed walking predicts the response to larger external balance disturbances.Research questionWe tested the hypothesis that larger values of local dynamic instability during unperturbed walking would positively correlate with larger changes thereof due to optical flow balance perturbations.MethodsWe used trunk kinematics collected in subjects across a spectrum of walking balance integrity – young adults, older non-fallers, and older fallers – during walking with and without mediolateral optical flow perturbations of four different amplitudes.ResultsWe first found evidence that optical flow perturbations of sufficient amplitude appear capable of revealing independent effects of aging and falls history that are not otherwise apparent during normal, unperturbed walking. We also reject our primary hypothesis; a significant negative correlation only in young adults indicated that individuals with more local dynamic instability during normal, unperturbed walking exhibitedsmallerresponses to optical flow perturbations. In contrast, most prominently in older fallers, the response to optical flow perturbations appeared independent of their baseline level of dynamic instability.SignificanceWe propose that predicting the response to balance perturbations in older fallers, at least that measured using local dynamic stability, likely requires measuring that response directly.
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影响因子：
3.7
作者：
Yeh TT;Cluff T;Balasubramaniam R
通讯作者：
Balasubramaniam R
日常生活测量中跌倒风险预测因素的识别
影响因子：
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作者：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Dingwell, Jonathan B.
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2
作者：
Logan, David;Kiemel, Tim;Jeka, John J.
通讯作者：
Jeka, John J.