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首页> 外文期刊>Journal of Biomechanics >LEG STIFFNESS AND STRIDE FREQUENCY IN HUMAN RUNNING
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LEG STIFFNESS AND STRIDE FREQUENCY IN HUMAN RUNNING

机译：跑步时的腿部僵硬和步幅频率

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When humans and other mammals run, the body's complex system of muscle, tendon and ligament springs behaves like a single linear spring ('leg spring'). A simple spring-mass model, consisting of a single linear leg spring and a mass equivalent to the animal's mass, has been shown to describe the mechanics of running remarkably well. Force platform measurements from running animals, including humans, have shown that the stiffness of the leg spring remains nearly the same at all speeds and that the spring-mass system is adjusted for higher speeds by increasing the angle swept by the leg spring. The goal of the present study is to determine the relative importance of changes to the leg spring stiffness and the angle swept by the leg spring when humans alter their stride frequency at a given running speed. Human subjects ran on treadmill-mounted force platform at 2.5 ms(-1) while using a range of stride frequencies from 26% below to 36% above the preferred stride frequency. Force platform measurements revealed that the stiffness of the leg spring increased by 2.3-fold from 7.0 to 16.3 kNm(-1) between the lowest and highest stride frequencies. The angle swept by the leg spring decreased at higher stride frequencies, partially offsetting the effect of the increased leg spring stiffness on the mechanical behavior of the spring-mass system. We conclude that the most important adjustment to the body's spring system to accommodate higher stride frequencies is that leg spring becomes stiffer. [References: 25]
机译：当人类和其他哺乳动物奔跑时，人体复杂的肌肉，腱和韧带弹簧系统的行为就像一个线性弹簧（“腿部弹簧”）。一个简单的弹簧-质量模型由一个线性的腿形弹簧和一个等于动物质量的质量组成，已被证明可以很好地描述跑步的机制。来自包括人类在内的奔跑动物的测力平台测量结果表明，腿弹簧的刚度在所有速度下都几乎保持不变，并且通过增加腿弹簧扫过的角度，弹簧质量系统针对更高的速度进行了调整。本研究的目的是确定当人们以给定的运行速度改变步幅频率时，腿弹簧刚度和腿弹簧扫过的角度变化的相对重要性。人类受试者以2.5毫秒（-1）的速度在跑步机上安装的跑步机上跑步，同时使用的步幅频率范围从首选步幅频率以下26％到高于首选步幅频率36％。测力平台的测量结果表明，在最低和最高步幅频率之间，支腿弹簧的刚度从7.0增加到16.3 kNm（-1），增加了2.3倍。腿部弹簧扫过的角度在较高的步幅频率下减小，从而部分抵消了腿部弹簧刚度增加对弹簧-质量系统机械性能的影响。我们得出结论，为适应更高的步幅频率，对身体弹簧系统进行的最重要的调整是腿部弹簧变得更硬。 [参考：25]

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