Post-exercise Appetite Responses in Type 1 Diabetes

Inclusion Criteria: * Aged between 18-50 years old (male or female). * Free from any diabetes related complications (apart from mild background diabetic retinopathy). * HbA1c \<8.5%. * Not taking any prescribed medication other than insulin, and treated with a stable insulin regimen composed of a combination of slow/long acting insulin (glargine or detemir) and fast-acting insulin analogues (lispro or aspart), for a minimum of 6 months before the start of the study. * Demonstrate normal cardiac function in response to exercise. Exclusion Criteria: * Aged younger than 18, or older than 50 years. * Suffering from, or diagnosed with a diabetes related complication (apart from mild background diabetic retinopathy). * HbA1c \>8.5%. * Currently taking prescribed medication, and not currently treated with a stable basal bolus regimen composed of a combination glargine or detemir, and lispro or aspart for at least 6 months before the start of the study. * Failure to demonstrate normal cardiopulmonary responses during exercise, or have a medical condition which could prevent completion of exercise or be exacerbated because of.