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相关概念视频

Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
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相关实验视频

Updated: Feb 27, 2026

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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使用局部定位系统评估高强度加速努力 - - 引入相对加速值的概念,以冰上曲棍球.

Christian Bielmann1,2, Karin Fischer-Sonderegger1, Quirin Söhnlein3

  • 1Department of Elite Sport, Swiss Federal Institute of Sport Magglingen SFISM, 2532 Magglingen, Switzerland.

Sports (Basel, Switzerland)
|February 26, 2026
PubMed
概括

目前的冰球加速评估有缺陷. 这项研究引入了一个相对加速度值,考虑初始速度,提供更准确的测量强烈的努力,特别是在更高的速度.

关键词:
加速加速加速的加速.外部负载的外部负载.冰上曲棍球 冰上曲棍球动力学运动学当地定位系统局部定位系统玩家跟踪 玩家跟踪团队运动是团队运动.穿戴式技术是一种可穿戴技术.

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科学领域:

  • 运动科学 运动科学 运动科学
  • 生物力学 生物力学
  • 冰上曲棍球绩效分析

背景情况:

  • 冰球中评估加速力 (accefforts) 的现有方法不考虑初始滑冰速度.
  • 这种遗漏可能导致对压力强度和神经肌肉强烈努力的偏见评估.

研究的目的:

  • 介绍冰球相对加速值 (relthreshold) 的概念方法.
  • 概述relthreshold用于评估访问努力的潜在好处.
  • 通过relthreshold评估的acc努力与固定值进行比较.

主要方法:

  • 模拟了初始滑冰速度依赖的最大自愿加速能力 (amax-vinit能力) 使用来自10场比赛的17名球员的运动数据.
  • 确定了一个特定于团队的rel门 (rel门_75% = 3.23 - 0.365vinit).
  • 通过使用relthreshold_75%和固定值 (fixthreshold_2 = 2 m·s-2) 来评估 accefforts .

主要成果:

  • 固定的值估计比相对值增加了89.1±35.8%的精度努力.
  • 只有三分之一的固定值的运动力度超过了相对值,这表明真正的神经肌肉强烈的努力.
  • 在滑冰速度>4m·s-1时,固定的值评估可忽略不计的ac努力,而相对值评估了27.2±9.3%的总ac努力.

结论:

  • 适应初始滑冰速度的加速值提供了一个概念上更有效的方法来评估冰上曲棍球中的努力.
  • 相对加速度值方法提供了更细致的评估高强度的努力.
  • 调查结果表明,需要修订冰球比赛现有的绩效分析方法.