<qa>  What is the aim of the session?- Visit 4: 24 hours DreaMed MD-AID or SAP with afternoon exercise in the time between 16:30 and 19:30: an i.v. catheter will be inserted in the antecubital or cephalic vein for plasma BG and emergency. Cycle ergometer will be adjusted for each subject work rate, seat height,.., they will be instructed to pedal at steady rate of 50-60 rotations per minute RPM. The subjects will cycle for 40minutes - high intensity interval training 2 - 6 sprints of 20 seconds at 80 VO2max with interval of 6 minutes low-moderate activity 55 VO2max total of 40 minutes between the sprint. The aim of this session is to imitate childrens physical activity bursts of intensive physical activity interspersed with varying intervals of activity of low and moderate intensity. 