Summary of Human Ankle Mechanical Impedance During Walking.
Summary of Human Ankle Mechanical Impedance During Walking.
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DOI：
10.1109/jtehm.2016.2601613
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发表时间：
2016
影响因子：
3.4
通讯作者：
Krebs HI
中科院分区：
文献类型：
--
作者：
Lee H;Rouse EJ;Krebs HI
人类踝关节在行走和理解控制踝关节行为的生物力学因素中起着至关重要的作用，并为正常和病理改变的步态提供了基本的见解。先前的研究人员在许多生物力学任务中对踝关节动力学和运动学进行了全面的研究，包括运动；然而，直到最近，研究人员才能够量化在行走过程中脚踝的机械阻抗是如何变化的。机械阻抗描述了摄动过程中关节位置和关节扭矩之间的动态关系，通常用刚度、阻尼和惯性来表示。这篇简短交流的目的是统一前两项研究的结果，这两项研究都是在步行过程中测量踝关节矢状面机械阻抗，每项研究都研究了步态周期的不同区域。Rouse等人测量了从后期加载响应到终端姿态的脚踝阻抗，Lee等人量化了从摇摆前到早期加载响应的脚踝阻抗。虽然阻抗的刚度分量随着步行的站立阶段的进展而显著增加，但步态周期中阻尼的变化远小于观察到的刚度变化。此外，在行走的摆动阶段，刚度和阻尼都保持较低。未来的工作将集中在量化立场相位“推离”区域的阻抗，以及在冠状面测量这些特性。直到最近，研究人员才能够量化在行走过程中脚踝的机械阻抗是如何变化的。这一交流统一了前两项研究的结果，测量了行走过程中矢状面踝关节的机械阻抗，其中每项研究都研究了步态周期的不同区域。Rouse等人测量了从加载后期到摇摆前的脚踝阻抗，Lee等人量化了从初始摇摆到加载早期的脚踝阻抗。虽然阻抗的刚度分量随着步行的站立阶段的进展而显著增加，但在步态周期中阻尼的变化远小于观察到的刚度变化。
The human ankle joint plays a critical role during walking and understanding the biomechanical factors that govern ankle behavior and provides fundamental insight into normal and pathologically altered gait. Previous researchers have comprehensively studied ankle joint kinetics and kinematics during many biomechanical tasks, including locomotion; however, only recently have researchers been able to quantify how the mechanical impedance of the ankle varies during walking. The mechanical impedance describes the dynamic relationship between the joint position and the joint torque during perturbation, and is often represented in terms of stiffness, damping, and inertia. The purpose of this short communication is to unify the results of the first two studies measuring ankle mechanical impedance in the sagittal plane during walking, where each study investigated differing regions of the gait cycle. Rouse et al. measured ankle impedance from late loading response to terminal stance, where Lee et al. quantified ankle impedance from pre-swing to early loading response. While stiffness component of impedance increases significantly as the stance phase of walking progressed, the change in damping during the gait cycle is much less than the changes observed in stiffness. In addition, both stiffness and damping remained low during the swing phase of walking. Future work will focus on quantifying impedance during the “push off” region of stance phase, as well as measurement of these properties in the coronal plane. Only recently have researchers been able to quantify how the mechanical impedance of the ankle varies during walking. This communication unifies the results of the first two studies measuring ankle mechanical impedance in the sagittal plane during walking, where each study investigated differing regions of the gait cycle. Rouse et al. measured ankle impedance from late loading response to pre-swing, where Lee et al. quantified ankle impedance from initial swing to early loading response. While the stiffness component of impedance increases significantly as the stance phase of walking progresses, the change in damping during the gait cycle is much less than the changes observed in stiffness.