The effects of sensory loss and walking speed on the orbital dynamic stability of human walking
The effects of sensory loss and walking speed on the orbital dynamic stability of human walking
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DOI：
10.1016/j.jbiomech.2006.08.006
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发表时间：
2007-01-01
影响因子：
2.4
通讯作者：
Marin, Laura C.
中科院分区：
文献类型：
--
作者：
Dingwell, Jonathan B.;Kang Hyun Gu;Marin, Laura C.
外周感觉反馈被认为对维持行走稳定性有显著贡献。糖尿病周围神经病变患者跌倒的风险大大增加。以前，我们证明了神经病患者较慢的步行速度会改善局部动态稳定性。然而，所有受试者在行走过程中均表现出明显的局部不稳定性，尽管在测试过程中没有受试者跌倒或绊倒。本研究旨在确定行走过程中外周感觉和行走速度的显著变化是否以及如何影响眼眶稳定性。从两个先前的实验中检查躯干和下肢运动学，这些实验将具有显著神经病变的患者与健康对照组进行比较，并在年轻健康受试者中以多种不同的速度行走。计算了每个时间序列的最大Floquet乘数，以量化这些运动的轨道稳定性。所有受试者都表现出稳定的行走运动学，即使这些相同的运动学先前被证明是局部不稳定的。神经病患者和对照组的眼眶稳定性差异很小，除了膝关节运动（p = 0.001）外，无统计学意义（0.380
Peripheral sensory feedback is believed to contribute significantly to maintaining walking stability. Patients with diabetic peripheral neuropathy have a greatly increased risk of falling. Previously, we demonstrated that slower walking speeds in neuropathic patients lead to improved local dynamic stability. However, all subjects exhibited significant local instability during walking, even though no subject fell or stumbled during testing. The present study was conducted to determine if and how significant changes in peripheral sensation and walking speed affect orbital stability during walking. Trunk and lower extremity kinematics were examined from two prior experiments that compared patients with significant neuropathy to healthy controls and walking at multiple different speeds in young healthy subjects. Maximum Floquet multipliers were computed for each time series to quantify the orbital stability of these movements. All subjects exhibited orbitally stable walking kinematics, even though these same kinematics were previously shown to be locally unstable. Differences in orbital stability between neuropathic and control subjects were small and, with the exception of knee joint movements (p = 0.001), not statistically significant (0.380