Diabetes

Exercise and Type 1 Diabetes

How activity affects blood glucose, tips for safe workouts, and managing hypos during exercise.

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Exercise and Type 1 Diabetes

This is a quick-reference companion. For a full protocol — insulin adjustments, basal strategies, CGM setup, and delayed hypo prevention — see Managing Type 1 Diabetes During Exercise.

How exercise affects glucose

  • Aerobic → tends to lower BGL (risk of hypos).
  • Anaerobic/sprint → may raise BGL short term.
  • Effects can last hours.

Before activity

  • Check BGL; if low, treat first.
  • Have glucose on hand.
  • Adjust insulin if planned strenuous exercise.

During

  • Monitor every 30–60 min for longer sessions.
  • Use CGM alerts if available.
  • Drink water regularly.

After

  • Watch for delayed hypos (overnight).
  • Consider reduced basal or extra carbs if needed.

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