Post-exercise Glucose Management in Type 1 Diabetes: Comparing Carbohydrate Intake and Insulin Reduction Strategies.

Area of Science:

• Endocrinology and Metabolism
• Exercise Physiology
• Diabetes Management

Background:

• Post-exercise hypoglycemia is a significant concern for individuals with type 1 diabetes (T1D) using continuous subcutaneous insulin infusion (CSII).
• Effective glucose management strategies are crucial to mitigate risks associated with exercise in T1D.
• Understanding the impact of different CSII adjustments on glucose control post-exercise is vital.

Purpose of the Study:

• To compare the efficacy of two distinct post-exercise glucose management strategies in T1D patients on CSII.
• To evaluate blood glucose stability and time to first hypoglycemic event under different CSII adjustment protocols.

Main Methods:

• 46 adults and adolescents with T1D performed a 60-minute ergocycling session.
• Participants were randomized to either a 20% basal insulin reduction with reduced dinner bolus, or a post-exercise snack with a modified insulin bolus.
• Continuous glucose monitoring was employed for 13 hours post-exercise to assess glucose profiles and hypoglycemia.

Main Results:

• No significant differences were observed in overall blood glucose stability (time in range 4.0-10.0 mmol/L) between the two strategies.
• Both strategies showed comparable time spent below 4.0 mmol/L, though high inter-individual variability was noted.
• The basal insulin reduction strategy significantly delayed the onset of the first hypoglycemic event (140 min vs. 83 min, p=0.04).

Conclusions:

• Both basal insulin reduction and snack-based strategies offer comparable blood glucose stability post-exercise in T1D patients on CSII.
• Basal insulin reduction demonstrates a significant clinical advantage by delaying the onset of post-exercise hypoglycemia.
• This suggests basal insulin adjustment is a potentially superior strategy for preventing early hypoglycemia after exercise.