Hickson R C, Hagberg J M, Ehsani A A, Holloszy J O
Med Sci Sports Exerc. 1981;13(1):17-20.
Nine subjects participated in an exercise program for 40 min/day, 6 days/wk. The training work rates were kept constant for the first 4 wk. The work rates were then increased to a higher level and kept constant for an additional 5 wk. During both training periods, maximum oxygen uptake (VO2max) increased for the first 3 wk and then remained constant. The half times (tl/2) of the increases in VO2max during the two periods were 10.3 and 10.8 days. These results provide evidence that the adaptation to endurance exercise of the system(s) that limit VO2max is rapid, with a tl/2 of less than 11 days. The total increase in VO2max in the 9 wk of training was 23%. The decreases in the heart rate and blood lactate responses to a standard submaximal exercise test also occurred within the first 2 to 3 wk of each training period. Our results show that unless the training stimulus is increased, a high intensity daily exercise program does not result in a further increase in VO2max or further decreases in the blood lactate or heart rate responses to submaximal exercise after 3 wk.
9名受试者参加了一项运动计划，每天运动40分钟，每周6天。在最初的4周内，训练工作强度保持恒定。之后工作强度提高到更高水平，并在接下来的5周内保持不变。在两个训练阶段中，最大摄氧量（VO2max）在前3周增加，然后保持稳定。两个阶段VO2max增加的半衰期（tl/2）分别为10.3天和10.8天。这些结果表明，限制VO2max的系统对耐力运动的适应很快，半衰期小于11天。9周训练中VO2max的总增加量为23%。在每个训练阶段的前2至3周内，对标准次最大运动测试的心率和血乳酸反应也出现了下降。我们的结果表明，除非增加训练刺激，否则高强度的日常运动计划在3周后不会导致VO2max进一步增加，也不会使次最大运动的血乳酸或心率反应进一步降低。
