Dynamic margins of stability during human walking in destabilizing environments.
Dynamic margins of stability during human walking in destabilizing environments.
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DOI：
10.1016/j.jbiomech.2011.12.027
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发表时间：
2012-04-05
影响因子：
2.4
通讯作者：
Dingwell JB
中科院分区：
文献类型：
--
作者：
McAndrew Young PM;Wilken JM;Dingwell JB
了解人类在行走时如何保持稳定，特别是在受到干扰的情况下，是防止跌倒的关键。在这里，我们量化了施加连续的、伪随机的前后（AP）和中外侧（ML）振荡对动态行走稳定性控制的影响。12名受试者在计算机辅助康复环境（CAREN）系统中完成5次3分钟步行试验，每5种条件：无扰动（NOP）、AP平台（APP）或视觉（APV）或ML平台（MLP）或视觉（MLV）振荡。我们计算了每次试验的AP和ML的稳定边际（MOS）。在所有扰动条件下，平均MOSml均略大于NOP （p≤0.038）。APP、MLP和MLV振荡的平均MOSap显著小于NOP （p < 0.0005）。在MLP和MLV振荡期间，MOSap和MOSml的变异性显著大于NOP （p < 0.0005）。我们还使用首次回归图直接量化了任何给定步骤上的MOS如何影响后续步骤的MOS。各实验条件间MOSml的步进动态变化显著（p < 0.0005）。这些变化表明，在扰动条件下，受试者可能一直在试图控制脚的位置，从而控制稳定性。在评估个体如何控制行走稳定性方面，量化动态稳定性边缘的逐级变化可能比平均最小最小值更有用。
Understanding how humans maintain stability when walking, particularly when exposed to perturbations, is key to preventing falls. Here, we quantified how imposing continuous, pseudorandom anterior-posterior (AP) and mediolateral (ML) oscillations affected the control of dynamic walking stability. Twelve subjects completed five 3-minute walking trials in the Computer Assisted Rehabilitation ENvironment (CAREN) system under each of 5 conditions: no perturbation (NOP), AP platform (APP) or visual (APV) or ML platform (MLP) or visual (MLV) oscillations. We computed AP and ML margins of stability (MOS) for each trial. Mean MOSml were consistently slightly larger than NOP during all perturbation conditions (p ≤ 0.038). Mean MOSap for the APP, MLP and MLV oscillations were significantly smaller than during NOP (p < 0.0005). Variability of both MOSap and MOSml was significantly greater during the MLP and MLV oscillations than during NOP (p < 0.0005). We also directly quantified how the MOS on any given step affected the MOS on the following step using first-return plots. There were significant changes in step-to-step MOSml dynamics between experimental conditions (p < 0.0005). These changes suggested that subjects may have been trying to control foot placement, and consequently stability, during the perturbation conditions. Quantifying step-to-step changes in margins of dynamic stability may be more useful than mean MOS in assessing how individuals control walking stability.
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影响因子：
2.4
作者：
Dingwell, Jonathan B.;Kang Hyun Gu;Marin, Laura C.
通讯作者：
Marin, Laura C.
影响因子：
2.5
作者：
Pijnappels, Mirjarn;Reeves, Neil D.;Van Dieen, Jaap H.
通讯作者：
Van Dieen, Jaap H.
DOI：
10.1046/j.1532-5415.2002.50056.x
发表时间：
2002-02-01
影响因子：
6.3
作者：
Pavol, MJ;Owings, TM;Grabiner, MD
通讯作者：
Grabiner, MD
影响因子：
2.1
作者：
Hof, At L.
通讯作者：
Hof, At L.
影响因子：
2.5
作者：
O'Connor, Shawn M.;Kuo, Arthur D.
通讯作者：
Kuo, Arthur D.