通过多段与局部约束限制质量运动中心:它对压力行为中心的影响
Lucas Michaud1, Laurent Pommier2, Valérie Grondin2
1School of Human Kinetics, University of Ottawa, Ottawa, QC, Canada.
Motor control
|February 3, 2026
概括
在静止时限制质量中心 (COM) 运动会改变压力中心 (COP) 动态. 基于皮带的系统提供了一个比基于板的设置更生态的方法来研究传感运动调节.
科学领域:
- 生物力学 生物力学
- 人类运动科学科学 人类运动科学
- 神经科学是一个神经科学.
背景情况:
- 在静止时对质量中心 (COM) 运动的多段制约会影响压力中心 (COP) 动态.
- 假设限制下增加的COP运动反映了对感官输入的探索行为.
- 之前的研究使用了非生态木板式装置,限制了解释.
研究的目的:
- 比较基于板式和基于带式COM限制对COP动态的影响.
- 调查传统的 (变量) 和动态的 (规律性,频率) COP 测量.
- 确定不同COM限制方法的生态有效性.
主要方法:
- 参与者在不受限制的,基于木板的限制条件和基于皮带的限制条件下进行了静静的站立试验.
- 测试了双眼开放和闭眼的条件.
- 分析包括COP变化,规律性和频率组件.
主要成果:
- 与不受限制的站立相比,基于木板的限制增加了COP的变化和规律性.
- 基于皮带的限制降低了COP的变化,增加了不规则性.
- 视觉输入对这些COP行为变化的影响最小.
- 在这两种限制类型下,COP的提议仍然存在,建议在COM稳定之外发挥作用.
结论:
- 基于皮带的系统提供了一个更生态有效的方法来限制站立时的COM运动.
- COP的动态反映了超出简单姿势稳定的感觉运动调节策略.
- 研究结果支持使用带式系统来研究受限立场中的探索性行为.
相关概念视频
Equation of Motion: Center of Mass
703
The equation of motion for a single particle can be expanded to encompass a system of particles consisting of n particles. For any arbitrarily chosen particle within this system, the net force acting upon it is the aggregate of both internal and external forces. Extending this principle to all particles within the system results in the equation of motion for the entire assembly.
Internal forces between any pair of particles manifest as collinear pairs of equal magnitude but opposite directions,...
Internal forces between any pair of particles manifest as collinear pairs of equal magnitude but opposite directions,...
703
Center of Mass
2.0K
The center of mass is the point at which the total mass of an object can be said to be concentrated. It is a fundamental principle in mechanics and physics that applies to all objects regardless of their shape or size. The center of gravity is the point at which an object’s weight appears to be concentrated and can be used to balance the object perfectly.
The knowledge of the center of mass can also help us to describe and predict the motion of objects. For example, when a ball is thrown...
The knowledge of the center of mass can also help us to describe and predict the motion of objects. For example, when a ball is thrown...
2.0K
Center of Mass: Introduction
22.1K
Any object that obeys Newton's second law of motion is made up of a large number of infinitesimally small particles. Objects in motion can be as simple as atoms or as complex as gymnasts performing in the Olympics. The motion of such objects is described about a point called the center of mass of the object. The center of mass of an object is a point that acts as if the whole mass is concentrated at that point. The center of mass of an object with a large number of infinitesimally small...
22.1K
Significance of Center of Mass
7.7K
The center of mass of an object is defined as the mass-weighted average position of all the particles that comprise the object. The significance of the center of mass of an object can be seen by looking at its dynamics. The time derivative of the center of mass gives its velocity, assuming that the object's mass remains constant over time. Furthermore, the total linear momentum of an object can be seen as the linear momentum of a single particle of the object's total mass moving with...
7.7K
Applications of Integration to Find Centers of Mass
79
Rotational equilibrium provides a natural framework for defining the center of mass of a system. For a plank balanced on a pivot with two unequal masses, equilibrium is achieved when the net torque about the pivot is zero. Torque is defined as the product of a force and its perpendicular distance from the pivot. When the torques due to all forces cancel, the pivot coincides with the center of mass of the system.For a system composed of several discrete point masses, the center of mass lies at...
79
Lattice Centering and Coordination Number
11.6K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Types of Unit Cells
Imagine taking a large number of identical...
11.6K


