We examined the effect of fluid replacement after moderate exercise, for 30 min at 60 %HRmax. The investigation was carried out in five healthy university students, 24±2 (mean ± S.E.) years old. Subjects drank one of the following four test solutions twice, immediately after and 30 min after the exercise: 1) distilled water (group W), 2) 6% glucose solution (group G), 3) 0.5% citric acid solution containing 6% glucose solution (group C), and 4) vinegar diluted ten-fold with water (about 0.5% acetic acid) containing 6% glucose solution (group V). Each ingestion volume was 250 ml at a time. Six blood samples (before exercise and 0, 15, 30, 60 and 120 min after exercise) were drawn. The three physical sensations, fatigue, thirst and relaxation, were checked up at three times, immediately after the exercise, and after the first and the second drinking.
　No significant increase in hematocrit and serum lactic acid concentration was observed in all groups immediately after exercise. Group G, C and V increased significantly in serum glucose, serum insulin and serum lactic acid after the ingestion. However, the suppression in the increment rate was observed in two groups, C and V. Free fatty acids reduced immediately after the exercise, and during recovery period, group W only showed a significant increase to the contrary other three groups indicated decreasing tendency. Group G indicated the most effective improvement substantially the whole physical sensations. However, vinegar contributed to the equal or more speedy improvement, especially on the sensation of fatigue and relaxation.
　During exercise recovery period, the ingestion of citric acid or vinegar with glucose indicated suppressing tendency on the variation of blood glucose as compared to the ingestion of glucose only. Moreover, addition of vinegar effected the improvement of a few physical sensations after exercise. These results suggests that vinegar ingested with glucose is more efficient solution for the individual who have a few abnormalities on blood glucose metabolism and/or physically fatigue person after exercise.

DESCENTE SPORTS SCIENCE Vol.19/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE