相关实验视频
Updated: Jul 19, 2025

08:12
Experimental Methods to Study Human Postural Control
Published on: September 11, 2019
9.5K
扰动时间对恢复全身角动量在非常慢的步行过程中的影响
M van Mierlo1, M Abma1, M Vlutters1
1Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands.
Human movement science
|August 13, 2023
概括
在行走过程中恢复人体平衡依赖于全身角动量 (WBAM) 调节. 平衡扰动的时间影响了地面反应力 (GRF) 和压力中心 (CoP) 的调整如何有助于恢复稳定.
科学领域:
- 生物力学 生物力学
- 人类的机动运动.
- 神经科学是一个神经科学.
背景情况:
- 人类在行走时积极调节全身角动量 (WBAM),以获得稳定.
- 与质量中心 (CoM) 相对应的地面反应力 (GRF) 的动量臂调制对于在干扰后恢复WBAM至关重要.
- 之前的研究表明,水平的GRF调制,而不是压力中心 (CoP) 调制,主要是驱动时刻臂变化,在脚开始时的斜腰平面扰动期间.
研究的目的:
- 调查全身角动量 (WBAM) 扰动的时间如何影响GRF和CoP调制在平衡恢复期间对动量臂调整的贡献.
- 为了确定扰动时间是否会影响非常慢步行时的平衡控制机制.
主要方法:
- 在三个不同的步态周期阶段对WBAM进行了干扰:脚右侧 (TOR),中转 (MS) 和脚跟右侧 (HSR).
- 外部力量相当于16%的体重被施加到骨盆和上半身在相反的方向150 ms.
- 分析重点是GRF和COP中的调制及其对相对于CoM的时刻臂的影响.
主要成果:
- WBAM扰动的发作时间并没有显著改变GRF时刻臂的调制.
- 然而,COP和GRF调制对动量臂变化的相对贡献随着扰动时间的变化而有显著变化.
- 随着前方音调扰乱,CoP调制在MS和HSR中比TOR发挥了更大的作用.
- 对于MS和HSR的反向音调干扰,CoP调制反对WBAM恢复,需要在CoM后面提供更大的GRF贡献.
结论:
- 对于WBAM恢复所需的特定时刻臂调制是独立于扰动开始时间的.
- 乱发生的步态周期阶段在实现平衡恢复方面显著影响了CoP和GRF调制之间的相互作用.
相关概念视频
Conservation of Angular Momentum
10.3K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
10.3K
Conservation of Angular Momentum: Application
11.0K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
11.0K
Principle of Angular Impulse and Momentum: Problem Solving
243
Consider a ball of mass m, attached to a massless rod of known length, subjected to a time-dependent torque. If the initial velocity of the mass is known, then the final velocity of the mass for time t can be determined using the principle of angular impulse and momentum.
Initially, a free-body diagram of the system is drawn to illustrate all the forces acting upon the system, providing a crucial understanding of the dynamics at play. Then, the principle of angular impulse and momentum is...
Initially, a free-body diagram of the system is drawn to illustrate all the forces acting upon the system, providing a crucial understanding of the dynamics at play. Then, the principle of angular impulse and momentum is...
243
Angular Momentum about an Arbitrary Axis
221
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
221
Physical Pendulum
1.8K
When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°.
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it...
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it...
1.8K

