Time course of the adaptive responses of aerobic power and heart rate to training

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Abstract
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 increased to a higher level and kept constant for an additional 5 wk. During both training periods maximum O2 uptake (.ovrhdot.VO2 max) increased for the first 3 wk and then remained constant. The half times (t1/2) of the increases in .ovrhdot.VO2 max during the 2 periods were 10.3 and 10.8 days. The adaptation to endurance exercise of the system(s) that limit .ovrhdot.VO2 max is rapid, with a t1/2 of < 11 days. The total increase in .ovrhdot.VO2 max in the 9 wk of training was 23%. The decreases in the heart rate and blood lactate responses to a standard submaximal exercise test occurred within the first 2-3 wk of each training period. Unless the training stimulus is increased, a high intensity daily exercise program may not result in a further increase in .ovrhdot.VO2 max, or further decreases in the blood lactate or heart rate responses to submaximal exercise after 3 wk.

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