Insulin by Jet-injection for Hyperglycemia in Diabetes

After hyperglycaemia (18-23 mmol/l) has been reached (by decreasing or interrupting exogenous insulin administration 12-24 hours before the experiment), aspart insulin (in a dose of 1.5 times the amount of insulin needed to reduce blood glucose to 6 mmol/l calculated by the insulin-sensitivity factor) will be administered subcutaneously by Insujet pen or conventional insulin pen, on two separate occasions, or vice versa. The injection will be given by the subject under supervision of the research staff.