Absorption of Insulin Following Subcutaneous Bolus Administration With Different Bolus Durations

Inclusion Criteria: * Informed consent obtained after being advised of the nature of the study * Male or female aged 18-60 years (both inclusive) * Type 1 diabetes treated with multiple daily insulin injection or continuous subcutaneous insulin infusion for 12 months * Fasting C-peptide \< 0.3nmol/L * Body mass index 20.0-30.0 kg/m² (both inclusive) * HbA1c \< 10% Exclusion Criteria: * Female of childbearing potential who is pregnant, breast-feeding or intend to become pregnant or is not using adequate contraceptive methods * Skin pathology or condition prohibiting needle insertion/insulin administration as judged by the investigator * History of bleeding disorder * Current participation in another clinical study * Use of insulin lispro \>2 weeks * Significant acute or chronic illness that might interfere with subject safety or integrity of results as judged by the investigator * Smoker (defined as \>5 cigarettes/d) * Lipodystrophy * Current treatment with systemic (oral or i.v.) corticosteroids, monoamine oxidase (MAO) inhibitors, non-selective beta-blockers, growth hormone, herbal products or non-routine vitamins. Furthermore, thyroid hormones are not allowed unless the use of these has been stable during the past 3 months * Significant history of alcoholism or drug abuse or a positive result in urine drug/alcohol screen Study Day Exclusion Criteria: * Strenuous exercise within the last 24 hours prior to the clamp visit * Non-fasting (i.e. consumption of food or beverages, other than water, later than 22:00 hours the evening before the visit) except if slight intake of rapidly absorbable carbohydrates has been necessary in order to prevent hypoglycaemia * Injection of long-acting insulin (e.g. insulin glargine or insulin detemir) later than 12:00 hours (noon), 2 days before the clamp visit * Injection of NPH insulin or other intermediate-acting insulin products later than 12:00 hours (noon) on the day before the clamp visit * Injection of any short acting insulin (aspart, lispro, glulisine) or more than 6 IU of human insulin between 22:00 hours and 03:00 hours the night before the clamp visit * Injection of any insulin later than 03:00 hours the night before the clamp visit * Infusion of any insulin later than 03:00 hours the night before the clamp visit for subjects using continuous subcutaneous insulin infusion (CSII) * Positive result of alcohol breath test * Any medical condition that, in the opinion of the Investigator, could interfere with insulin pharmacokinetics and/or glucose metabolism