A recent study published in Diabetes Research and Clinical Practice has found that moderate-intensity continuous exercise helps lower blood sugar levels immediately in women with Type 1 Diabetes (T1D)—regardless of the menstrual cycle phase. However, the study also highlights that post-exercise glucose control can vary depending on the phase of the cycle, especially during the luteal phase, where the risk of hyperglycemia increases.
What Was the Study About?
The study involved 25 women with T1D, who completed two 30-minute moderate aerobic sessions—one during the follicular phase and the other during the luteal phase of their menstrual cycles. Blood sugar levels were monitored both during exercise and 24 hours after using continuous glucose monitoring (CGM).
Key Findings:
- Immediate glucose drop: In both phases, blood glucose fell from 155 mg/dL to 110 mg/dL after 30 minutes of exercise, showing a reliable glucose-lowering effect of exercise.
- Low risk of hypoglycemia: Less than 2% experienced hypoglycemia within 24 hours post-exercise, indicating that moderate exercise is generally safe across menstrual phases.
- Increased hyperglycemia in the luteal phase: Time spent in hyperglycemia rose from 38.2% to 44.2% after exercise during the luteal phase, showing that hormonal changes can impact glucose regulation.
- TIR differences: Time-in-range (TIR) remained stable after exercise in the follicular phase but decreased in the luteal phase, showing less stable glucose control.
- Tailored insulin needed: The findings suggest that insulin adjustments may be required during the luteal phase to manage blood sugar levels better after exercise.
Why It Matters
This study confirms the benefits and safety of regular exercise for women with T1D but adds an important layer—menstrual cycle awareness. As hormonal changes can affect how the body responds to physical activity, insulin therapy should be personalized for each phase of the cycle to ensure better glucose control and fewer complications.
At The Doctorpreneur Academy, we believe in the power of combining science, patient awareness, and technology to support better health outcomes. This research is an important reminder for doctors, diabetes educators, and fitness professionals to consider menstrual cycle phases when advising women with T1D on exercise and insulin management.
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