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相关概念视频

Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

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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...
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Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
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相关实验视频

Updated: Sep 15, 2025

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
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[液压控制的异动力学强度测试]

Jan Schröder1, Miriam Knauer2, Gunnar Liedtke2

  • 1Institut für Bewegungswissenschaft, Universität Hamburg, Turmweg 2, Hamburg, Deutschland. jan.schroeder@uni-hamburg.de.

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|July 17, 2025
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概括
此摘要是机器生成的。

与等离子力学方法相比,等离子力学动力计为强度测试提供了更高的可靠性和时间效率. 干和膝盖曲延伸比率的模式特定差异需要不同的基准值用于临床应用.

关键词:
交叉截面分析分析同位数收缩的收缩方式肌肉的力量 肌肉的力量参考值是一个参考值.扭矩 扭矩是指扭矩.

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科学领域:

  • 生物力学和运动生理学
  • 神经肌肉功能评估评估
  • 康复科学 康复科学 康复科学

背景情况:

  • 液压控制的强度测试设备,称为 (准) 异动力学动力计,提供恒定的运动速度.
  • 对于异动力动力测量与其他强度测试模式存在有限的比较文献.
  • 本研究解决了这一差距,通过使用异动力学动力测试与同位测试相比,呈现了使用异动力学动力测试的干部和膝盖扭矩的参考值和可靠性.

研究的目的:

  • 通过使用液压控制的异动力学动力计来确定参考值并评估干和膝盖最大扭矩和曲延伸比率的可靠性.
  • 为了比较异动力强度测试模式与异度强度测试.
  • 评估异动力学协议的时间节约性和可靠性.

主要方法:

  • 一项涉及45名健康成年人 (21名女性,年龄26.1±3.9岁,BMI 23.2±2.5 kg/m2) 的横截面研究.
  • 使用Factum®测试设备评估干部和膝盖的曲,延伸和功能比率.
  • 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式: 测试模式:
  • 时间节约和可靠性 (ICC3.k) 在20名参与者的子样本中进行评估.

主要成果:

  • 异动力学试验的速度比同位测试 (ICC3.k 0.550-0.899) 快50%,并且显示出更高的可靠性 (ICC3.k 0.736-0.933).
  • 异动体曲-延伸比率平均为68% (干部) 和55% (膝盖),相比之下,同位测试的63% (干部).
  • 曲延伸比率一般接近 2:3,由于较低的膝盖曲力,异面膝盖比率偏差 (≈1:2) .

结论:

  • 存在特定模式的差异,特别是在曲-延伸比率方面,限制了异动力学和同度测试之间的直接临床可比性.
  • 这两种协议都足够可靠,但异动力学协议提供了显著的时间节约优势.
  • 本研究中的身体重量调整的峰值扭矩和功能比值的设备特定基准值可以指导临床环境中的强度测试.