Diabetes, obesity & metabolism · 2025
Glycaemic impact of the pre-exercise timing of an elevated glucose target implemented using an automated insulin delivery system in adults with type 1 diabetes.
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Morrison Dale J, Vogrin Sara, Zaharieva Dessi P, Manos Georgina, Halim Bella, O'Neal David
Аннотация
AIM: To determine the impact of a temporary elevated glucose target (TT) on hypoglycaemia and glycaemic outcomes with exercise in adults with type 1 diabetes using an automated insulin delivery (AID) system.
MATERIALS AND METHODS: Twenty-six participants using the Medtronic MiniMed™ 780G system performed 16 exercise bouts: 12 afternoon bouts (four 40 min and four 90 min moderate-intensity exercise [MIE] and four 40 min high-intensity interval exercise [HIE]) and four morning bouts of 40 min MIE, with a TT set 60 min (TT60), 20 min (TT20), 0 min (TT0) or no TT (TTnil) pre-exercise. Oral carbohydrate was consumed pre-exercise for glucose <100 mg/dL and during exercise for sensor glucose <70 mg/dL or symptomatic hypoglycaemia confirmed by fingerprick blood glucose. The primary outcome was time below range (TBR; <70 mg/dL) from exercise commencement to 2 h post-exercise, with each TT condition compared with TT60 via sign rank test.
RESULTS: The primary outcome, median TBR, was 0% from exercise commencement to 120 min post-exercise for all conditions with no difference between TT conditions. Insulin delivery in the 2 h pre-exercise was higher for TTnil compared to TT60 (1.3 [0.9, 2.4] Units vs. 2.0 [1.1, 3.0] Units; p = 0.013); however there was no difference between TT conditions for starting glucose, time in range (TIR) or for the number of participants who experienced a hypoglycaemia episode from exercise commencement to 2 h post-exercise.
CONCLUSIONS: Glycaemia with exercise was excellent regardless of TT timing, which had no measurable effect on TBR during and post-exercise in a well-controlled cohort in the absence of a recent meal.
MATERIALS AND METHODS: Twenty-six participants using the Medtronic MiniMed™ 780G system performed 16 exercise bouts: 12 afternoon bouts (four 40 min and four 90 min moderate-intensity exercise [MIE] and four 40 min high-intensity interval exercise [HIE]) and four morning bouts of 40 min MIE, with a TT set 60 min (TT60), 20 min (TT20), 0 min (TT0) or no TT (TTnil) pre-exercise. Oral carbohydrate was consumed pre-exercise for glucose <100 mg/dL and during exercise for sensor glucose <70 mg/dL or symptomatic hypoglycaemia confirmed by fingerprick blood glucose. The primary outcome was time below range (TBR; <70 mg/dL) from exercise commencement to 2 h post-exercise, with each TT condition compared with TT60 via sign rank test.
RESULTS: The primary outcome, median TBR, was 0% from exercise commencement to 120 min post-exercise for all conditions with no difference between TT conditions. Insulin delivery in the 2 h pre-exercise was higher for TTnil compared to TT60 (1.3 [0.9, 2.4] Units vs. 2.0 [1.1, 3.0] Units; p = 0.013); however there was no difference between TT conditions for starting glucose, time in range (TIR) or for the number of participants who experienced a hypoglycaemia episode from exercise commencement to 2 h post-exercise.
CONCLUSIONS: Glycaemia with exercise was excellent regardless of TT timing, which had no measurable effect on TBR during and post-exercise in a well-controlled cohort in the absence of a recent meal.