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Dovc, Klemen; Macedoni, Maddalena; Bratina, Natasa; Lepej, Dusanka; Nimri, Revital; Atlas, Eran; Muller, Ido; Kordonouri, Olga; Biester, Torben; Danne, Thomas; Phillip, Moshe; Battelino, Tadej
Diabetologia, 11/2017, Letnik: 60, Številka: 11Journal Article
Aims/hypothesis Hypoglycaemia during and after exercise remains a challenge. The present study evaluated the safety and efficacy of closed-loop insulin delivery during unannounced (to the closed-loop algorithm) afternoon physical activity and during the following night in young people with type 1 diabetes. Methods A randomised, two-arm, open-label, in-hospital, crossover clinical trial was performed at a single site in Slovenia. The order was randomly determined using an automated web-based programme with randomly permuted blocks of four. Allocation assignment was not masked. Children and adolescents with type 1 diabetes who were experienced insulin pump users were eligible for the trial. During four separate in-hospital visits, the participants performed two unannounced exercise protocols: moderate intensity (55% of V ⋅ O 2 max ) and moderate intensity with integrated high-intensity sprints (55/80% of V ⋅ O 2 max ), using the same study device either for closed-loop or open-loop insulin delivery. We investigated glycaemic control during the exercise period and the following night. The closed-loop insulin delivery was applied from 15:00 h on the day of the exercise to 13:00 h on the following day. Results Between 20 January and 16 June 2016, 20 eligible participants (9 female, mean age 14.2 ± 2.0 years, HbA 1c 7.7 ± 0.6% 60.0 ± 6.6 mmol/mol) were included in the trial and performed all trial-mandated activities. The median proportion of time spent in hypoglycaemia below 3.3 mmol/l was 0.00% for both treatment modalities ( p = 0.7910). Use of the closed-loop insulin delivery system increased the proportion of time spent within the target glucose range of 3.9–10 mmol/l when compared with open-loop delivery: 84.1% (interquartile range 70.0–85.5) vs 68.7% (59.0–77.7), respectively ( p = 0.0057), over the entire study period. This was achieved with significantly less insulin delivered via the closed-loop ( p = 0.0123). Conclusions/interpretation Closed-loop insulin delivery was safe both during and after unannounced exercise protocols in the in-hospital environment, maintaining glucose values mostly within the target range without an increased risk of hypoglycaemia. Trial registration Clinicaltrials.gov NCT02657083 Funding University Medical Centre Ljubljana, Slovenian National Research Agency, and ISPAD Research Fellowship
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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