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首页> 外文期刊>Journal of Biomechanics >Simultaneous positive and negative external mechanical work in human walking
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Simultaneous positive and negative external mechanical work in human walking

机译：人体步行同时进行正负外部机械工作

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In human walking. the center of mass motion is similar to an inverted pendulum. Viewing double support as a transition from one inverted pendulum to the next, we hypothesized that the leading leg performs negative work to redirect the center of mass velocity, while simultaneously. the trailing leg performs positive work to replace the lost energy. To test this hypothesis. we developed a method to quantify the external mechanical work performed by each limb (individual limbs method). Traditional measures of external mechanical work use the sum of the around reaction forces acting on the limbs (combined limbs method) allowing for the mathematical cancellation of simultaneous positive and negative work during multiple support periods. We expected to find that the traditional combined limbs method underestimates external mechanical work by a substantial amount. We used both methods to measure the external mechanical work performed by humans walking over a range of speeds. We found that during double support, the legs perform a substantial amount of Positive and negative external work simultaneously. The combined limbs measures of positive and negative external work were approximately 33% less than those calculated using the individual limbs method. At all speeds. the trailing leg performs greater than 97% of the double support positive work while the leading leg performs greater than 94% of the double support negative work. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 22]
机译：在人类行走中。质心运动类似于倒立摆。将双重支撑视为从一个倒立摆到另一个倒立摆的过渡，我们假设前腿执行负功以同时重定向质心。尾腿进行积极的工作以弥补失去的能量。为了检验这个假设。我们开发了一种量化每个肢体进行的外部机械功的方法（个体肢体方法）。传统的外部机械工作量度使用作用在肢体上的周围反作用力的总和（组合肢体方法），从而可以在数学上抵消多个支撑周期中同时进行的正负运动。我们希望发现传统的联合肢体方法大大低估了外部机械功。我们使用这两种方法来测量人类在一定速度下行走所执行的外部机械工作。我们发现，在双重支撑期间，腿部同时执行大量的正负外部工作。积极的和消极的外部工作的综合肢体测量值比使用单个肢体方法计算得出的测量值低约33％。无论如何。后腿执行的双支撑负功大于97％，而前腿执行的双支撑负功大于94％。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：22]

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