Petrofsky J S, Lind A R
J Appl Physiol Respir Environ Exerc Physiol. 1978 Jul;45(1):60-3. doi: 10.1152/jappl.1978.45.1.60.
Four male volunteers served as subjects to examine the metabolic and ventilatory cost of both positive and negative lifting tasks as compared to bicycle ergometry. In different experiments, four boxes weighing 0.91, 6.82, 22.73, and 36.36 kg were lifted up to or down from a height of 60 cm at rates as high as 70 lifts/min for periods of 4 min. The data were then compared to those obtained from bicycling at a rate of 50 rpm at work loads up to 1,500 kmp/min. Work at any given box weight had a substantially higher oxygen and ventilatory cost than similar levels of work on the bicycle ergometer. The reason for these differences appeared to lie in the energy cost of moving parts of the body. When the weight of the boxes was low, there was little difference between the oxygen cost of positive and negative work, but as the weight of the boxes increased, the expected physiological differences in positive and negative work was established.
四名男性志愿者作为受试者，以研究与自行车测力计相比，正向和负向举重任务的代谢和通气成本。在不同的实验中，将四个重量分别为0.91、6.82、22.73和36.36千克的箱子以高达70次/分钟的速度从60厘米的高度向上或向下举起，持续4分钟。然后将这些数据与在工作负荷高达1500千米/分钟、转速为50转/分钟的自行车运动中获得的数据进行比较。在任何给定的箱子重量下，工作的氧气和通气成本都比在自行车测力计上进行的类似水平的工作高得多。这些差异的原因似乎在于身体各部位运动的能量成本。当箱子重量较低时，正向和负向工作的氧气成本几乎没有差异，但随着箱子重量的增加，正向和负向工作中预期的生理差异就显现出来了。
