ABSTRACT

　Introduction: Postprandial abnormal glucose elevation (PPGE) is one of the risk factors of　cardiovascular disease (CVD) in both diabetes and nondiabetes groups. Effective control of PPGE might prevent the chronic diseases such as CVD. However, there is no consensus on optimal exercise timing to reduce PPGE. The purpose of this study was to determine the most effective timing of exercise. Method: Six participants completed the 4 different exercise patterns in random order, which were 1) no exercise, 2) pre-meal exercise (jogging), 3) post-meal exercise (jogging), 4) breaking up sitting time (3sets of 1min jog+30sec rest, every 30min, BST) . Pre and post-meal exercise pattern was 20 sets of interval exercise: 1min jogging and 30 second rest at the lactate threshold intensity of running (62.4±12.9% VO₂max). Blood glucose concentration was measured continuously during each of the patterns. Heart rate (HR) was measured after the first bout of exercise in a day. Timing, order and composition of the meals was the same in each test Result: Heart rate was significantly lower for BST than pre-and post-exercise patterns. Peak blood glucose concentration attenuated in BST after breakfast was lower compared with pre (p=0.072) and post-exercise (p<0.05). After lunch BST glucose concentration was lower than for post-exercise (p<0.05). After dinner was no significant differences between patterns. Area under curves of glucose concentration during 24 hours and 2h postprandial was not different for each pattern. Conclusion: The results of the study suggest that BST was more effective than preexercise and post exercise in preventing PPGE, especially in the morning.

DESCENTE SPORTS SCIENCE Vol.37/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE