表面EMG的概率密度函数 (PDF) 随着力量的增加:前骨和横骨之间的比较
Silvia Recalde-Villamayor1, Javier Navallas1, Cristina Mariscal2
1Department of Electrical and Electronical Engineering, Public University of Navarra, Pamplona, Spain.
概括
表面EMG填充过程在前 (TA) 和横 (VL) 肌肉之间有所不同. 通过EMG填充因子分析这种肌肉和性别特定的过程,揭示了不同的运动单元招募模式.
科学领域:
- 电子肌图学 电子肌图学
- 发动机控制器 发动机控制器
- 肌肉生理学 肌肉生理学
背景情况:
- 表面EMG (sEMG) 信号通过运动单元潜能填充,对于理解肌肉激活至关重要.
- 之前的研究仅集中在四头肌,需要对其他肌肉进行调查.
研究的目的:
- 描述前阴 (TA) 中的sEMG填充过程.
- 为了比较TA的sEMG填充过程与巨大的横向 (VL).
主要方法:
- 在逐渐增加力 (0-80% MVC) 期间,从TA和VL肌肉记录了sEMG.
- 使用EMG填充因子 (FF) 分析了sEMG填充过程,该因子来自sEMG信号的PDF形状.
主要成果:
- 在TA和VL肌肉之间观察到sEMG填充的显著差异.
- 最初的sEMG填充因肌肉和性别而异:TA在72%的男性和53%的女性中显示出较低的初始填充;VL在89%的男性中显示出较低的初始填充,但只有12%的女性.
- 在高力 (>40% MVC) 时,TA表现出不同的尖峰幅度 (FF ~0.5),而VL表现出相似的幅度 (FF ~0.63).
结论:
- TA信号的概率密度函数 (PDF) 在高强度下接近拉普拉斯函数,与VL信号的近高斯函数不同.
- 与VL相比,sEMG填充曲线为TA提供了更多信息.
- sEMG填充过程显示了肌肉特异性和性别特异性特征.
相关概念视频
01:15Strain and Elastic Modulus
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
01:20Strain-Energy Density
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
01:20Elastic Strain Energy for Shearing Stresses
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...