Reduced training frequencies and maintenance of increased aerobic power

Abstract

The minimum training frequency necessary to maintain the exercise-induced increase in maximum O2 uptake (.ovrhdot.VO2 max) was studied. Subjects (12, average age = 23 yr) participated in an endurance exercise program of bicycling and running 40 min/d [day], 6 d/wk. After 10 wk they continued to train 4 d/wk or 2 d/wk for an additional 15 wk. Intensity and duration for the additional 15 wk remained the same as in the 10th wk of training. The average increase of .ovrhdot.VO2 max in response to 10 wk of training was 25% when measured during bicycle testing and 20% when measured during treadmill testing. .ovrhdot.VO2 max in the 4 d/wk and 2 d/wk groups remained essentially the same as the trained levels when determined at 5 wk intervals of reduced training. More exercise evidently is required to increase .ovrhdot.VO2 max than that required to maintain it at the trained level in young adults performing high-intensity exercise. It is possible to maintain the increased .ovrhdot.VO2 max for at least 15 wk by training at high intensity for 2 d/wk or 4 d/wk.