- For both visits, the blood sugar needs to be between 120 and 200 at the start of the exercise. Between lunch and 4 p.m., the blood sugar will be checked a few times. To lower the blood sugar to this range, the child may be given insulin through the catheter to be used to draw the blood samples. No bolus insulin doses will be given with the child's pump after lunch. If the study doctors or nurses think the child's blood sugar may be too low to start exercise, a snack may be given to get the blood sugar to be in this range. If the blood sugar is too high or too low and cannot be corrected quickly enough, the exercise for that day may be postponed. If this happens, the child will need to return on another day.