Simultaneous positive and negative external mechanical work in human walking
Simultaneous positive and negative external mechanical work in human walking
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DOI：
10.1016/s0021-9290(01)00169-5
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发表时间：
2002-01-01
影响因子：
2.4
通讯作者：
Kuo, AD
中科院分区：
文献类型：
--
作者：
Donelan, JM;Kram, R;Kuo, AD
在人类行走中。质心的运动类似于倒立摆。将双支撑视为从一个倒立摆到下一个倒立摆的过渡，我们假设领先的支腿同时执行负的功来重定向质心速度。后腿执行正功，以补充损失的能量。来检验这一假设。我们开发了一种方法来量化每个肢体所做的外部机械功(单肢方法)。传统的外部机械功测量方法使用作用于四肢的周围反作用力的总和(组合臂法)，允许在多个支撑期内同时进行正负功的数学抵消。我们期望发现，传统的四肢组合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以不同的速度行走时所做的外部机械功。我们发现，在双支撑过程中，腿部同时执行大量的正负外部功。正负外力的综合四肢测量值比单独四肢测量法少约33%。全速前进。后腿完成了97%以上的双支撑正功，而前腿完成了94%以上的双支撑负功。(C)2002爱思唯尔科学有限公司。保留所有权利。
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.