Using a Personalized Decision Support Tool to Help People With Type 1 Diabetes Manage Exercise

Inclusion Criteria Inclusion Criteria: All Participants (Type 1 Diabetes and Healthy Control Groups) * Adults between the age of 18-60 years * Able to perform moderate intensity walking for 60 minutes (target 40-60% age-predicted maximal heart rate). * Willing and able to comply with study procedures, including supervised exercise visits and device wear * Able to provide written informed consent Inclusion Criteria: Type 1 Diabetes Group Only * Clinical diagnosis of type 1 diabetes for \>1 year, based on the investigator's clinical judgement * Current use of continuous subcutaneous insulin infusion with Tandem Control-IQ and a compatible continuous glucose monitor (CGM) for \>1 month prior to enrollment * Stable insulin delivery regimen, with no planned changes to insulin pump settings or insulin dosing strategy during the study period * Consistent CGM use during the month prior to enrollment (\>80% data availability) Inclusion Criteria: Health Control Group Only * No diagnosis of diabetes or other disorders of glucose metabolism * Not using insulin or glucose-lowering medications Exclusion Criteria Exclusion Criteria: All Participants * Intercurrent illness or medical condition that precludes safe participation in moderate-intensity exercise (e.g., unstable cardiopulmonary disease, uncontrolled arrhythmia, or uncontrolled hypertension), as previously assessed by the participant's primary care physician * Known coronary artery disease with symptoms limiting moderate phy…