Accuracy of Continuous Glucose Monitoring (CGM) during Continuous and High Intensity Interval Exercise in Patients with Type 1 Diabetes Mellitus
Continuous exercise (CON) and high intensity interval exercise (HIIE) can be safely performed with type 1 diabetes mellitus (T1DM) Additionally, continuous glucose monitoring (CGM) systems may serve as a tool to reduce the risk of exercise induced hypoglycemia. It is unclear if CGM is accurate during CON and HIIE at different mean workloads. Seven T1DM patients performed CON and HIIE at 5% below (L) and above (M) the first lactate turn point (LTP1) and 5% below the second lactate turn point (LTP2) (H) on a cycle ergometer. Glucose was measured via CGM and in capillary blood (BG) Differences were found in comparison of CGM vs. BG in three out of the six tests (p 0.05) In CON, bias and levels of agreement for L, M, and H were found at: 0.85 3.44, 5.15) mmol*L 1, 0.45 3.95, 3.05) mmol*L 1, 0.31 8.83, 8.20) mmol*L 1 and at 1.17 2.06, 4.40) mmol*L 1, 0.11 5.79, 6.01) mmol*L 1, 1.48 2.60, 5.57) mmol*L 1 in HIIE for the same intensities. Clinically acceptable results (except for CON H) were found. CGM estimated BG to be clinically acceptable, except for CON H. Additionally, using CGM may increase avoidance of exercise induced hypoglycemia, but usual BG control should be performed during intense exercise.
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