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Frames: Problem Solving II01:26

Frames: Problem Solving II

294
Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
294
Machines: Problem Solving II01:30

Machines: Problem Solving II

377
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
377

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相关实验视频

Updated: Sep 18, 2025

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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基于PBT框架的半式机械分析

Miguel Rodal1, Emilio Manuel Arrayales-Millán2, Mirvana Elizabeth Gonzalez-Macías2

  • 1BioẼrgon Research Group, University of Extremadura, 10003 Cáceres, Spain.

Bioengineering (Basel, Switzerland)
|June 26, 2025
PubMed
概括

基于功率的训练 (PBT) 生物力学分析了举重运动员的半 (HS). 增加负载显著降低了速度,加速和功率,突出显示了训练和伤害预防中需要详细分析的需要.

关键词:
运动生物力学 运动生物力学一半的腰半的腰机械动力 机械动力 机械动力基于力量的培训是基于力量的培训.

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相关实验视频

Last Updated: Sep 18, 2025

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科学领域:

  • 体育 生物力学 运动 生物力学
  • 运动生理学 运动生理学

背景情况:

  • 肌肉力量对于运动表现,机械功率优化和伤害预防至关重要.
  • 了解半 (HS) 等练习的生物力学对于有效的训练至关重要.

研究的目的:

  • 通过基于功率的训练 (PBT) 方法,用生物力学来描述半 (HS).
  • 分析HS运动的四个不同的阶段 (下降/升起加速/减速).

主要方法:

  • 在HS期间,利用光谱测量来追踪主题条系统的质量中心.
  • 计算位置,速度,加速度,机械功率,并使用渐进负载 (20-80% 1RM) 工作.
  • 涉及5名国家级举重运动员,分别为U17,U20和U23级别.

主要成果:

  • 观察到随着负载的增加,速度,加速度和机械功率显著下降.
  • 运动阶段持续时间和相对于负载的位移范围的变化.
  • 证明了负载对半坐神经肌肉需求的影响.

结论:

  • PBT方法和质量分析中心为HS提供了精确的生物力学理解.
  • 这些发现对于优化HS在研究,绩效规划和运动员监测中的应用至关重要.
  • 强调对神经肌肉需求和伤害预防进行详细分析的重要性.