The experimental results of the change in end tidal air acetone content show that the acetone content remains in a range of about two times of the average value, 0.9-2.8μg/l (n=16), average 1.8±0.6μg/l. After physical exercise, the acetone content increased to 27.4μg/l, and further again rised in 90 min., demonstrating pattern with two peaks. After physiological exercise and after-drinking physiological salt (0.9%-NaCl soln.), any significant change in the acetone content was noticed. However, a carbonate drink and a sport drink showed a complicated effect on the time course of change of acetone which was significant difference on individual subject. This result indicates that acetone content is highly influenced by the food and drink in-take. In the case of an student, the relationship between serum-sugar concentration and acetone content in end tidal expired air was significant (p<0.05).

DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE