The influence of gait speed on local dynamic stability of walking
The influence of gait speed on local dynamic stability of walking
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DOI：
10.1016/j.gaitpost.2006.03.003
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发表时间：
2007-02-01
期刊：
影响因子：
2.4
通讯作者：
Granata, Kevin P.
中科院分区：
文献类型：
--
作者：
England, Scott A.;Granata, Kevin P.
本研究的重点是研究正常步态下步行速度在稳定性中的作用。局部动态稳定性通过使用最大有限时间Lyapumov指数lambda（max）来量化。这些量化了受试者在电动跑步机上以20%、40%、60%和80%的弗劳德速度行走时记录的关节角度运动学变异性的衰减率。步行速度越慢，m、x与步行速度呈单调趋势，λ (Max)越小。更小的lambda（Max）表示更稳定的行走动态。这一趋势是明显的，无论步幅持续时间的变化是否保留或被时间标准化的数据所消除。这表明较慢的步行速度会增加稳定性。这些结果可能比单独的基于变异性的分析更能揭示神经控制者行为的详细信息。(c) 2006 Elsevier B.V.版权所有
The focus of this study was to examine the role of walking velocity in stability during normal gait. Local dynamic stability was quantified through the use of maximum finite-time Lyapumov exponents, lambda(max). These quantify the rate of attenuation of kinematic variability of joint angle data recorded as subjects walked on a motorized treadmill at 20%, 40%, 60%, and 80% of the Froude velocity. A monotonic trend between m,x and walking velocity was observed with smaller lambda(Max) at slower walking velocities. Smaller lambda(Max) indicates more stable walking dynamics. This trend was evident whether stride duration variability remained or was removed by time normalizing the data. This suggests that slower walking velocities lead to increases in stability. These results may reveal more detailed information on the behavior of the neurocontroller than variability-based analyses alone. (c) 2006 Elsevier B.V. All rights reserved.