ABSTRACT

　This study aimed to determine the effects of sitting breaks with walking and slowspeed jogging on postprandial glycaemia and lipid responses in healthy young adults. Fourteen adults, aged 22±2 yrs, randomly completed three different 180-min trials after consuming standardised test meals. These trials were as follows: 1） uninterrupted sitting on an office chair（control），2） sitting with 3-min bouts of walking every 30 min and 3） sitting with 3-min bouts of slow-speed jogging every 30 min. Walking and jogging speeds were fixed at 6.0 km/h with a pacesetter. Venous blood samples and blood glucose concentrations using a continuous subcutaneous interstitial fluid glucose monitoring system were obtained. Incremental areas under the curves （iAUC） for the blood sample responses were calculated. Both the glucose iAUC and insulin iAUC over 180 min were significantly lower during the walking and jogging trials than during uninterrupted sitting. The insulin reduction ratio during the jogging trial had significant correlations with the maximal oxygen consumption per body weight compared with the control trial. However, there was no significant effect of sitting breaks on postprandial triglyceride response. Our results indicated that breaking up prolonged sitting with 3 min of walking or slow-speed jogging every 30 min improved postprandial glycaemic and insulinemic responses compared with uninterrupted sitting in healthy young adults. The effect of jogging breaks on suppressing insulin secretion may be more effective in individuals with lower aerobic fitness levels.　

DECENTE SPORTS SCIENCE Vol.44/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE