Type 1 diabetes (T1D) is a complex disease with a high risk of both hyper- and hypoglycemia which can lead to severe acute and chronic complications. The burden and complexity of managing T1D results in the majority of people not reaching adequate glycemic control. Our team has developed a smartphone based application, DailyDose, that combines continuous glucose monitoring data and insulin data to provide decision support for subjects with type 1 diabetes taking multiple daily injections (MDI). DailyDose provides on-demand, real-time dosing recommendations for insulin doses prior to meals and to correct hyperglycemia. DailyDose analyzes glucose patterns and provides weekly recommendations to the patient on insulin settings including carbohydrate ratios and correction factors. As needed, DailyDose will make weekly recommendations to change basal insulin. For subject safety, study investigators will set constraints on settings for short and long acting insulin during the onboarding process. DailyDose will not be able to recommend insulin dose changes above or below the set safety thresholds. DailyDose also provides recommendations on carbohydrate intake for exercise and includes hypoglycemia and hyperglycemia alarms.

Subjects will be on study for 10 weeks. Subjects will begin the study with a training visit on the Dexcom G6 CGM system and the InPen and Clipsulin smart insulin pens. Subjects will use these devices for the next 14 days at home. Subjects will return to OHSU at the end of the 14 days for a training on using the DailyDose system. Subjects will then return home to use the DailyDose system for 8 weeks. Sensor glucose, exercise, insulin and meal data will be collected during the DailyDose portion of the study in order to produce recommendations for insulin dosing. Subjects will receive up to 4 recommendations every 7 days. Subjects will also receive recommendations for exercise based on the PEAK exercise guidelines.

Subjects will wear the Dexcom G6 and an Apple Watch physical activity monitor for the entire study. Insulin data will be collected using the InPen for aspart insulin and Clipsulin for the long acting insulin. Subjects will complete a 30 minute aerobic exercise video at home once per week. Subjects will also be asked to complete two additional exercise sessions on their own at home, one aerobic session and the other whatever type of exercise they would normally do (aerobic, resistance etc.). Subjects will use the bolus calculator within the DailyDose app. Subjects will be instructed to test capillary blood glucose (CBG) after exercise, for symptoms of hypoglycemia or hypoglycemia alerts and again 15 minutes after rescue carbohydrate treatment until CBG >70 mg/dl.

Inclusion Criteria:

• Diagnosis of type 1 diabetes mellitus for at least 1 year.
• Male or female subjects 18 to 60 years of age.
• Physically willing and able to perform 30 min of exercise (as determined by the investigator after reviewing the subject's activity level).
• Use of multiple daily insulin injections (MDI) for at least 4 weeks at time of screening visit.
• A1C 7.0-10.0% at the time of screening.
• Willingness to follow all study procedures, including attending all clinic visits.
• Willingness to sign informed consent and HIPAA documents.

Exclusion Criteria:

• Female of childbearing potential who is pregnant or intending to become pregnant or breast-feeding, or is not using adequate contraceptive methods. Acceptable contraception includes birth control pill / patch / vaginal ring, Depo-Provera, Norplant, an IUD, the double barrier method (the woman uses a diaphragm and spermicide and the man uses a condom), or abstinence.
• Any cardiovascular disease, defined as a clinically significant EKG abnormality at the time of screening or any history of: stroke, heart failure, myocardial infarction, angina pectoris, or coronary arterial bypass graft or angioplasty. Diagnosis of 2nd or 3rd degree heart block or any non-physiological arrhythmia judged by the investigator to be exclusionary.
• Renal insufficiency (GFR < 60 ml/min, using the MDRD equation as reported by the OHSU laboratory).
• Liver failure, cirrhosis, or any other liver disease that compromises liver function as determined by the investigator.
• History of severe hypoglycemia during the past 6 months prior to screening visit or hypoglycemia unawareness as judged by the investigator. Subjects will complete a hypoglycemia awareness questionnaire. Subjects will be excluded for four or more R responses.
• Any active infection.
• Known or suspected abuse of alcohol, narcotics, or illicit drugs.
• Seizure disorder.
• Active foot ulceration.
• Peripheral arterial disease.
• Major surgical operation within 30 days prior to screening.
• Use of an investigational drug within 30 days prior to screening.
• Chronic usage of any immunosuppressive medication (such as cyclosporine, azathioprine, sirolimus, or tacrolimus).
• Allergy to aspart insulin.
• Current administration of oral or parenteral corticosteroids.
• Any life threatening disease, including malignant neoplasms and medical history of malignant neoplasms within the past 5 years prior to screening (except basal and squamous cell skin cancer).
• Current use of any medication intended to lower glucose other than insulin (ex. use of liraglutide).
• Vision impairment which in the opinion of the investigator would preclude the use of the smart phone application.
• A positive response to any of the questions from the Physical Activity Readiness Questionnaire with one exception: subject will not be excluded if he/she takes a single blood pressure medication that doesn't impact heart rate and blood pressure is controlled on the medication (blood pressure is less than 140/90 mmHg).

10 weeks

All participants that started a visit are included in the adverse events. All subjects completed all visits except one. That subject only completed two of the three visits.