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首页> 外文期刊>Journal of Biomechanics >Countermovement strategy changes with vertical jump height to accommodate feasible force constraints
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Countermovement strategy changes with vertical jump height to accommodate feasible force constraints

机译：反向运动策略随垂直跳跃高度而变化，以适应可行的力约束

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In this study, we developed a curve-fit model of countermovement dynamics and examined whether the characteristics of a countermovement jump can be quantified using the model parameter and its scaling; we expected that the model-based analysis would facilitate an understanding of the basic mechanisms of force reduction and propulsion with a simplified framework of the center of mass (CoM) mechanics. Ten healthy young subjects jumped straight up to five different levels ranging from approximately 10% to 35% of their body heights. The kinematic and kinetic data on the CoM were measured using a force plate system synchronized with motion capture cameras. All subjects generated larger vertical forces compared with their body weights from the countermovement and sufficiently lowered their CoM position to support the work performed by push-off as the vertical elevations became more challenging. The model simulation reasonably reproduced the trajectories of vertical force during the countermovement, and the model parameters were replaced by linear and polynomial regression functions in terms of the vertical jump height Gradual scaling trends of the individual model parameters were observed as a function of the vertical jump height with different degrees of scaling, depending on the subject. The results imply that the subjects may be aware of the jumping dynamics when subjected to various vertical jump heights and may select their countermovement strategies to effectively accommodate biomechanical constraints, i.e., limited force generation for the standing vertical jump.
机译：在这项研究中，我们建立了反运动动力学的曲线拟合模型，并研究了是否可以使用模型参数及其缩放来量化反运动跳跃的特征。我们希望基于模型的分析将通过质心（CoM）力学的简化框架，促进对力减小和推进的基本机制的理解。十名健康的年轻受试者直线上升到五种不同的水平，范围从其身高的大约10％到35％。使用与运动捕捉相机同步的测力板系统测量CoM的运动学和动力学数据。与之相反，所有对象产生的垂直力均大于其抵消运动产生的垂直力，并且随着垂直标高的增加，他们充分降低了CoM位置以支持通过推举完成的工作。模型仿真合理地再现了反向运动期间的垂直力轨迹，并根据垂直跳变高度用线性和多项式回归函数代替了模型参数。观察到各个模型参数随垂直跳变的逐渐缩放趋势高度与缩放比例不同，具体取决于主题。结果表明，受试者在经受各种垂直跳跃高度时可能意识到跳跃动力学，并且可以选择其反运动策略以有效地适应生物力学约束，即，站立立式跳跃产生的力有限。

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