EXTERNAL WORK IN WALKING
EXTERNAL WORK IN WALKING
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DOI：
10.1152/jappl.1963.18.1.1
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发表时间：
1963-01-01
影响因子：
3.3
通讯作者：
SAIBENE, FP
中科院分区：
文献类型：
--
作者：
CAVAGNA, GA;MARGARIA, R;SAIBENE, FP
从应用于受试者躯干的三重加速度计获得的记录中，已经计算出躯干在垂直、向前和横向方向上的位移。同时拍摄运动图像，测量身体重心的位移。根据这些数据计算出行走的外部机械功。物体重心的垂直位移和向前位移的功的总和给出了总的外部功；横向位移的能量可以忽略不计。总的外功似乎比仅从垂直位移计算的外功要小，因为升力中所做的功部分地由向前移动的物体的惯性力所支撑。在最经济的步行速度下，总的外部功达到最大值(0.1千卡/千克)，即4千米/小时，相当于0.48千卡/千克的能量消耗。在这种速度下，内功似乎可以忽略不计；在非常低的速度下，由于肌肉的静态收缩，它相当于明显的实体；在高速时，由于四肢的相当僵硬和不涉及重心移位的运动，它相当于明显的实体。提交于1962年5月25日
From records obtained from a triple accelerometer applied to the trunk of a subject the displacements of the trunk in vertical, forward, and lateral directions have been calculated. With motion pictures taken simultaneously, displacements of the center of gravity within the body were measured. From these data the external mechanical work of walking was calculated. The sum of work for vertical and for forward displacements of the center of gravity of the body gives the total external work; energy for the lateral displacements was negligible. Total external work appears to be lower than that calculated from the vertical displacements alone, because work done in lifting is partly sustained by the inertial force of the forward-moving body. Total external work reaches a highest value (0.1 kcal/km kg) at the most economical speed of walking, 4 km/hr, which corresponds to an energy consumption of 0.48 kcal/km kg. At this speed the internal work appears negligible; it amounts to appreciable entities at very low speeds because of the static contractions of the muscles, and at high speeds because of considerable stiffening of the limbs and movements not involving a displacement of the center of gravity.Submitted on May 25, 1962