六名健康的男性受试者在跑台上做两种不同的渐增负荷运动。在实验1中,跑台的起始速度为8公里/小时,以后按2公里/小时渐增速度,直到受试者力竭。每一负荷持续3分钟,在两负荷间有30秒的间歇。在实验2中,采用同样的负荷,所不同的是间歇时间为30分钟。在实验1、2中皆进行血乳酸、儿茶酚胺的测定,另在实验2中的30分钟间歇末也测定了这两个指标。心率及吸氧量仅在实验1中测定。受试者的最大耗氧量为57±6毫升/公斤/分。当负荷较小时,受试者在实验1及实验2中 Six healthy male subjects performed two different progressive load exercises on the treadmill. In Experiment 1, the treadmill started at a speed of 8 km / h and then increased at a rate of 2 km / h until subjects exhausted. Each load lasts 3 minutes, with a 30 second interval between the two loads. In Experiment 2, the same load was used, except that the rest time was 30 minutes. Blood lactate and catecholamines were measured in both experiments 1 and 2, and the other two indexes were also measured at the 30-minute intervals in Experiment 2. Heart rate and oxygen uptake were only determined in Experiment 1. Subjects maximum oxygen consumption of 57 ± 6 ml / kg / min. Subjects were in Experiment 1 and Experiment 2 when the load was small