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相关概念视频

Machines: Problem Solving II01:30

Machines: Problem Solving II

308
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.
308
Upward Impending Motion01:21

Upward Impending Motion

295
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
295
Applications of Stress01:04

Applications of Stress

265
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
265
Impact Loading01:19

Impact Loading

197
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
197
Eccentric Loading01:16

Eccentric Loading

366
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
366

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相关实验视频

Updated: Jun 30, 2025

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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外部手持的负荷会影响肩膀升高任务期间的头骨骨升高和向上旋转.

Alan Eldridge1, Everett Lohman1, Skulpan Asavasopon2

  • 1Physical Therapy Department, Loma Linda University, Loma Linda, CA, US.

International biomechanics
|March 19, 2024
PubMed
概括

在肩部提升过程中添加外部手持负荷,在健康个体中稍微增加了肩的提升和向上旋转. 这些发现确定了与肩部疼痛患者进行比较的正常值.

关键词:
生物力学 生物力学头骨是一个头骨.外部负载的外部负载.动力学是动力学.康复康复康复康复康复康复肩膀肩膀,肩膀肩膀,这是一个很好的方法.

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科学领域:

  • 生物力学 生物力学
  • 整形外科 整形外科 整形外科
  • 运动医学 运动医学

背景情况:

  • 改变的头骨动力学经常与肩部疼痛相关.
  • 抵抗运动是一种常见的干预措施,但它对外力负荷对肩膀运动的影响尚未得到充分证实.

研究的目的:

  • 为了研究在健康成年人肩部提升过程中外部手持负荷逐渐增加对肩膀动力学的影响.
  • 在不同的负载条件下,为脚动力学建立规范性数据.

主要方法:

  • 五十名健康参与者在四个条件下在头骨平面上进行了肩部提升:没有负荷 (控制) 和三个逐渐增加的外部手持负荷.
  • 三维运动捕捉技术被用来测量运动的上升和下降阶段的头巾旋转和转移.

主要成果:

  • 与没有负载相比,最高的外部负载在上升 (平均差异 = 3.2°,p = 0.006) 和下降 (平均差异 = 3.9°,p < 0.001) 期间显著增加了头骨的升高.
  • 在负载最高的下降过程中,观察到脚上方旋转的显著增加 (平均差异=4.5°,p < 0.001).

结论:

  • 外部手持载荷会导致健康个体的肩膀升高和向上旋转的轻微增加.
  • 既定的规范值可以作为评估肩部疼痛和肩膀功能改变的个体的基准.