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Application of Nonlinear Dynamics to Human Knee Movement on Plane and Inclined Treadmill

机译：非线性动力学在平面和倾斜跑步机上的人膝运动中的应用

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The objective of this study is to quantify and investigate nonlinear motion of the human knee joint for a sample of 7 healthy subjects on plane treadmill and inclined treadmill with an angle of 10° and for both knees of a sample of 3 patients who suffer of osteoarthritis, only on the plane treadmill, using nonlinear dynamics stability analysis. The largest Lyapunov exponent (LLE) and correlation dimensions are calculated as chaotic measures from the experimental time series of the flexion-extension angle of human knee joint. Larger values of LLEs obtained for patients group suffering by osteoarthritis are associated with more divergence and increase of knee variability, while smaller values obtained for healthy subjects reflect increase of local stability, less divergence and variability, less sensitivity to perturbations and higher resistance to stride-to-stride variability. The use of nonlinear tools may provide additional insight on the nature of the step-to-step fluctuations present in human and robotic locomotion.
机译：本研究的目的是为了量化和调查人体膝关节为对平面跑步机7名的健康受试者的样品的非线性运动和倾斜跑步机10°和3名的患者的样本两个膝盖的角度骨关节炎的谁遭受，只有在飞机上跑步机，采用非线性动力学稳定性分析。最大Lyapunov指数（LLE）和相关的尺寸被计算为从实验时间序列人体膝关节的屈伸角度的混乱的措施。由骨关节炎患者组痛苦获得LLES的较大的值与更发散和膝盖的变异性增加相关，而对于健康受试者获得的更小的值反映的局部稳定性增加，较少的发散性和多变性，扰动较小的灵敏度和更高的抗stride-到步幅变化。使用非线性工具可提供关于存在于人类和机器人运动的步骤到步骤波动的性质的额外洞察。

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