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相关概念视频

Maximum Deflection01:13

Maximum Deflection

454
When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
The maximum deflection occurs at a specific point, known as point O, where the tangent to the deflection curve is horizontal. To find point O, the slope of the tangent at any...
454

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相关实验视频

Updated: Jun 12, 2025

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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在最大速度单脚桥测试中评估腿筋活动的最佳高度.

Yuto Sano1,2, Masashi Kawabata1,3,3, Yuki Sumiya1

  • 1Physical Therapy for Sports and Musculoskeletal System, Kitasato University Graduate School of Medical Sciences, Sagamihara, Japan.

International journal of sports medicine
|February 11, 2025
PubMed
概括

使用40或60厘米平台的最大速度单脚桥测试有效地增加了腿筋激活. 这种功能测试可以提高运动员的部提升速度和脚跟承受力.

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Last Updated: Jun 12, 2025

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07:30

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科学领域:

  • 运动医学 运动医学
  • 生物力学 生物力学
  • 运动生理学 运动生理学

背景情况:

  • 腿筋张力损伤在高速运动运动中很常见.
  • 现有的功能测试不能可靠地诱导快速的腿筋收缩.
  • 优化对腿筋激活的测试对于伤害预防和康复至关重要.

研究的目的:

  • 为了确定最大速度单脚桥测试的最佳平台高度.
  • 为了在这个功能测试期间最大限度地激活腿筋肌肉.
  • 为了比较不同平台高度之间的腿筋激活和传统的单脚桥测试.

主要方法:

  • 一项涉及26名健康男性休运动员的横截面研究.
  • 参与者在20,40和60厘米的平台上进行了最大速度的单脚桥测试.
  • 电肌图测量了半肌和双腿骨活动;部提升速度和脚跟承受力也被记录下来.

主要成果:

  • 与常规测试 (0.5 m/s) 相比,最大速度单脚桥测试产生了明显更快的股提升速度 (0.7-1.0 m/s).
  • 在40厘米和60厘米的平台上观察到更高的腿筋 (半,大腿) 激活 (>90% MVC).
  • 40厘米的平台表现出最高的脚跟承受力,与增加的关节最大活动.

结论:

  • 最大速度单脚桥测试,特别是40和60厘米的平台,显著提高腿筋激活.
  • 这种经过修改的测试在诱导快速腿筋收缩方面比传统的单腿桥测试更有效.
  • 在功能测试中,建议使用40-60厘米的最佳平台高度来最大限度地提高腿筋参与度.