在关节运动期间,使用剪波弹性学量化添加长肌的剪模量
Takuya Kato1,2, Keigo Taniguchi3, Taiki Kodesho4
1Department of Physical Therapy, School of Health Sciences, Sapporo Medical University, Sapporo, Japan.
Scientific reports
|June 12, 2023
概括
部曲角度显著影响添加长筋 (AL) 肌肉.
科学领域:
- 生物力学 生物力学
- 肌肉骨研究的研究.
- 人类生理学 人类生理学
背景情况:
- 添加长筋 (AL) 肌肉在关节的稳定性和运动中起着至关重要的作用.
- 了解关节角度如何影响AL肌肉机制对于预防和康复伤害至关重要.
- 之前的研究还没有完全阐明部曲和AL肌肉剪切模量在绑架和旋转期间之间的关系.
研究的目的:
- 为了研究不同部曲角度对长肌肉 (AL) 的剪切模量的影响.
- 评估如何在不同的部曲角度下被动部绑架和旋转影响AL肌肉的机械性质.
- 为了确定AL肌肉在特定的部运动中所经历的机械应力.
主要方法:
- 16名男性参与者接受了AL肌肉剪切模块的评估.
- 在一系列的部屈曲角度 (-20°至80°) 以及被动部移动 (0°至40°) 中进行了测量.
- 额外的测试包括在特定的部曲和引角度变化的部旋转 (内部,中性,外部).
主要成果:
- 在20°部伸展时,AL肌肉的剪切模量显著高于部移动时的80°部屈曲 (P<0.05).
- 与中性或外部旋转相比,在20°内部旋转和20°延伸时观察到更高的剪切模量值 (P < 0.05).
- 在延伸位置下,AL肌肉的机械应力随着部绑架而增加,并且在部延伸时通过内部旋转进一步放大.
结论:
- 部曲角度显著改变了添加长筋 (AL) 肌肉的机械性能.
- 部伸展姿势增加了AL肌肉在绑架和内部旋转期间对AL肌肉的机械应力.
- 这些发现对理解肌肉张力损伤和优化物理治疗干预有影响.
相关概念视频
Elastic Strain Energy for Shearing Stresses
231
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...
231
Shearing Strain
524
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
524
Dynamic Modulus of Elasticity of Concrete
427
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
427
Strain and Elastic Modulus
3.7K
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...
3.7K
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
301
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.
301


