Exercising in Hot Conditions: How Does it Effect Blood Glucose in People With T1D

Inclusion Criteria: * T1D diagnosis more than 1 years ago (to ensure participants are out of the honeymoon period) * Using insulin therapy with multiple daily injections (MDI), insulin pump (pump), or hybrid closed-loop (HCL) o If using a HCL system have experience of using a pre-programmed basal rate in manual mode during exercise * Aged 18-65 years * Regularly engaged in endurance exercise (training at least twice per week for ≥30 minutes per session) Exclusion Criteria: * Pregnancy * \<6 months postpartum or stopped breastfeeding \<1 month before recruitment * Existing cerebrovascular or cardiovascular disease * Significant history of hyperglycaemia (HbA1c \>85 mmol/mol) * History of severe hypoglycaemia requiring third party assistance within the last 3 months * Body weight \<36.5kg * Difficulty swallowing tablets * Appointment for an MRI test that cannot be rescheduled * Obstructive gastrointestinal disease * History of gastrointestinal surgery * Have an implanted medical device