一个新的可靠的设备来评估干扩展器的强度
Waleska Reyes-Ferrada1,2, Luis Chirosa-Ríos1, Ignacio Chirosa-Ríos1
1Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.
Acta of bioengineering and biomechanics
|February 5, 2024
概括
这项研究发现,功能电机动力计 (FEMD) 是一个可靠的工具,用于评估各种速度和运动范围的干部延伸器强度. 该设备在同心和偏心收缩方面表现出稳定的重复性和良好的相对可靠性.
科学领域:
- 生物力学 生物力学
- 运动学 运动学
- 运动医学 运动医学
背景情况:
- 干部延伸器的强度对于运动表现和伤害预防至关重要.
- 需要准确可靠的评估方法来评估这个肌肉群.
- 功能电机动力计 (FEMD) 为标准化强度测试提供了一个潜在的解决方案.
研究的目的:
- 通过使用功能电机动力计 (FEMD) 确定车延伸器强度测量的可靠性.
- 评估不同测试速度和运动范围对测量可靠性的影响.
- 为了比较同心,偏心和同度收缩的可靠性.
主要方法:
- 31名男性参与者接受了干延伸器强度评估.
- 测试是在三个速度 (V1=0.15,V2=0.30,V3=0.45 m/s) 和两个运动范围 (R1=25%,R2=50%) 进行的,再加上在90°的同位数收缩.
- 使用类内相关系数 (ICC),典型误差 (TE) 和变化系数 (CV) 来量化可靠性.
主要成果:
- 在V1R1条件下,观察到平均和最大偏心强度的绝对可靠性高 (CV低).
- 在测试条件下,对于同心和偏心的平均和最大强度,证明了相对可靠性 (良好的ICC值).
- 对于同心强度和偏心强度,最可靠的测量方法是V1R1中的平均强度,而对于同度强度,则是最大强度.
结论:
- 功能电机动力计 (FEMD) 是一种非常可靠的设备,用于评估车延伸器的强度.
- 这些发现支持使用FEMD在研究和临床环境中对干部延伸器功能进行一致和可靠的评估.
- 特定的测试参数 (V1R1) 似乎是最大限度地提高某些强度测量的可靠性.
相关概念视频
Design Consideration
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key aspect...
The factor of safety is another key aspect...
Yield Criteria for Ductile Materials under Plane Stress
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as the...
The Maximum Shearing Stress Criterion, also known as the...
Soundness of Cement
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create ettringite,...
Non-destructive Tests for Concrete Strength
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...
Tensile Strength Considerations of Concrete
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen also...
The dimensions and shape of a concrete specimen also...
Dynamic Modulus of Elasticity of Concrete
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 a...
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 a...


