After excercising for a short periode of time the level of glucose increases, and because, in a prolonged periode of exercise, the consumtion of muscle glucose and blood glucose is the reason for the decrease in exercise ability, the efficient use and response of primal energy source glucose that is needed during exercise, in an energy metabolistic stand point, is an important physiological index. Therefore, it is very important for pitchers who need intermittent high intencity of power revelarion. So the reseach in which the goal is to understand the changes in the level of glucose during pitching and recovery time, using 10 players of the P high school in Seoul, can be abstacted as the following: 1. The glucose levels for the maximum pitching and recovery time for the high school students before exercise showed 82.60㎖/㎗. 2. After 4 endings the glucose measured l04.90㎖/㎗; however, allowing 6 minutes of recess after the 4th ending, it recorded a mximum of 113.00mg/dl before the ending, 7.7% inceased than after the 4th ending. 3. After the 9th ending it measured 83.60㎖/㎗, similar to stable periode; after 6 hours of recovery the numbers became the same; after 24, 48, 72 hours of recovery it showed lower than the stable periode. 4. The result of the ANOVA by repeated measures in maximal pitching and recovery as time passed, showed the R value to be 10.73(degree of freedom=16.63) with the significance in p＜0.001 so the difference of the mean values in the measurment time exists. 5. After the result of the post hoc comparison(DUNCAN multiple range test) of the repeatedly measured ANOVA., the repeated measure periode, by establishing as a group, the pre-5th ending and the post-4th ending as the highest mean response value, it implies that the usage of glucose during exercise is high.