Fasted Exercise Training in Type 1 Diabetes (FED-T1D)

This study compares aerobic exercise training performed before breakfast (i.e., in the fasted state) to similar training performed after breakfast in people with type 1 diabetes. Training will take place over 12 weeks.

People with type 1 diabetes (PwT1D) are encouraged to increase their physical activity (PA). Increasing the amount of PA can be difficult, especially for PwT1D who experience barriers to exercise. Therefore, simply recommending that PwT1D preform more exercise may not be the most effective prescription in the long term. Recent short-term studies have s suggest that exercise performed before eating (fasted) causes blood sugars to decrease less or even increase, compared exercise performed after a meal, which usually causes blood sugar to decrease. To date, no long-term study has compared the effects of exercise performed with or without eating beforehand in people with T1D. This study will compare the effects of 12 weeks of exercise before breakfast compared to 12 weeks of exercise after breakfast. It is expected that exercise before breakfast (i.e., in the fasted state) will lead to larger reductions in overall insulin dose, without the addition of more exercise.