Inclusion Criteria:

To be eligible for the study, a subject must meet the following criteria:

   - Clinical diagnosis of type 1 diabetes and using daily insulin therapy for at least one
   year and a Medtronic insulin infusion pump for at least 3 months The diagnosis of type
   1 diabetes is based on the investigator's judgment; C peptide level and antibody
   determinations are not required.

   - Age 10.0 - 35 years

Exclusion Criteria:

The presence of any of the following is an exclusion for the study:

   - Diabetic ketoacidosis in the past month

   - Hypoglycemic seizure or loss of consciousness in the past 3 months

   - History of seizure disorder (except for hypoglycemic seizure)

   - History of any heart disease including coronary artery disease, heart failure, or
   arrhythmias

   - Cystic fibrosis

   - Current use of oral/inhaled glucocorticoids, beta-blockers or other medications, which
   in the judgment of the investigator would be a contraindication to participation in
   the study.

   - History of ongoing renal disease (other than microalbuminuria).

   - Medical or psychiatric condition that in the judgment of the investigator might
   interfere with the completion of the protocol such as:

      - Inpatient psychiatric treatment in the past 6 months

      - Uncontrolled adrenal disorder

      - Abuse of alcohol

   - Pregnancy