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Nutrients 2016, 8(8), 489; doi:10.3390/nu8080489

Accuracy of Continuous Glucose Monitoring (CGM) during Continuous and High-Intensity Interval Exercise in Patients with Type 1 Diabetes Mellitus

1
Institute of Sports Sciences, Exercise Physiology, Training & Training Therapy Research Group, University of Graz, Max-Mell-Allee 11/III, Graz 8010, Austria
2
Department of Internal Medicine, Division of Endocrinology & Diabetology, Medical University of Graz, Auenbruggerplatz 15, Graz 8036, Austria
3
Institute of Health and Tourism Management, Sports Science Laboratory, FH JOANNEUM—University of Applied Sciences, Kaiser-Franz-Josef Straße 24, Bad Gleichenberg 8344, Austria
4
Center of Sports Medicine & Sports Orthopedics, University Outpatient Clinic, University of Potsdam, Am Neuen Palais 12, Potsdam 14469, Germany
5
Department of Haematology, Oncology and Palliative Care, Klinikum Ernst von Bergmann, Charlottenstraße 72, Potsdam 14467, Germany
These authors are contributed equally.
*
Author to whom correspondence should be addressed.
Received: 30 May 2016 / Revised: 19 July 2016 / Accepted: 28 July 2016 / Published: 10 August 2016
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Abstract

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. View Full-Text
Keywords: continuous glucose monitoring; exercise; diabetes; blood glucose continuous glucose monitoring; exercise; diabetes; blood glucose
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MDPI and ACS Style

Moser, O.; Mader, J.K.; Tschakert, G.; Mueller, A.; Groeschl, W.; Pieber, T.R.; Koehler, G.; Messerschmidt, J.; Hofmann, P. Accuracy of Continuous Glucose Monitoring (CGM) during Continuous and High-Intensity Interval Exercise in Patients with Type 1 Diabetes Mellitus. Nutrients 2016, 8, 489.

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