Cited by 64Diabetes Management and ResearchDiabetes Management and EducationDiabetes and associated disorders

Outpatient Closed-Loop Control with Unannounced Moderate Exercise in Adolescents Using Zone Model Predictive Control

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Huyett, Lauren M., Ly, Trang T., Forlenza, Gregory P., Reuschel-DiVirgilio, Suzette, Messer, Laurel H., Wadwa, R. Paul, Gondhalekar, Ravi, Doyle, Francis J. +4 more·2017·Diabetes Technology & Therapeutics

Abstract

BACKGROUND: The artificial pancreas (AP) has the potential to improve glycemic control in adolescents. This article presents the first evaluation in adolescents of the Zone Model Predictive Control and Health Monitoring System (ZMPC+HMS) AP algorithms, and their first evaluation in a supervised outpatient setting with frequent exercise. MATERIALS AND METHODS: Adolescents with type 1 diabetes underwent 3 days of closed-loop control (CLC) in a hotel setting with the ZMPC+HMS algorithms on the Diabetes Assistant platform. Subjects engaged in twice-daily exercise, including soccer, tennis, and bicycling. Meal size (unrestricted) was estimated and entered into the system by subjects to trigger a bolus, but exercise was not announced. RESULTS: Ten adolescents (11.9-17.7 years) completed 72 h of CLC, with data on 95 ± 14 h of sensor-augmented pump (SAP) therapy before CLC as a comparison to usual therapy. The percentage of time with continuous glucose monitor (CGM) 70-180 mg/dL was 71% ± 10% during CLC, compared to 57% ± 16% during SAP (P = 0.012). Nocturnal control during CLC was safe, with 0% (0%, 0.6%) of time with CGM <70 mg/dL compared to 1.1% (0.0%, 14%) during SAP. Despite large meals (estimated up to 120 g carbohydrate), only 8.0% ± 6.9% of time during CLC was spent with CGM >250 mg/dL (16% ± 14% during SAP). The system remained connected in CLC for 97% ± 2% of the total study time. No adverse events or severe hypoglycemia occurred. CONCLUSIONS: The use of the ZMPC+HMS algorithms is feasible in the adolescent outpatient environment and achieved significantly more time in the desired glycemic range than SAP in the face of unannounced exercise and large announced meal challenges.

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  • Automated insulin delivery systems can potentially modify insulin dosing in response to activity monitors to reduce the risk or severity of exercise-induced hypoglycemia in people living with type 1 diabetes.

    “Automated insulin delivery systems can potentially modify insulin dosing in response to activity monitors to reduce the risk (or severity) of exercise-induced hypoglycemia in people living with type 1 diabetes [7-10].”

    From Accuracy of Wrist-Worn Activity Monitors During Common Daily Physical Activities and Types of Structured Exercise: Evaluation Study (2018) · cites this paper as [7]

    The Discussion reports that the system reduced or suspended insulin delivery during or after exercise, supporting the potential to respond to exercise-related hypoglycemia. But the Results explicitly state that there was no activity measurement: the controller responded to continuous glucose monitor readings, not activity monitors. Our copy provides no page number for these passages. (LLM, conf=0.91)

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Research works printed but not linked: 2

  1. [3]Rawlings JB, Mayne DQ: Model Predictive Control Theory and Design. Madison, WI: Nob Hill Pub, 2009 [Google Scholar]
  2. [4]Seborg DE, Mellichamp DA, Edgar TF, et al. : Process Dynamics and Control, 3rd ed. Hoboken, NJ: John Wiley & Sons, 2011 [Google Scholar]

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Authors
Huyett, L. M., Ly, T. T., Forlenza, G. P., Reuschel-DiVirgilio, S., Messer, L. H., Wadwa, R. P., Gondhalekar, R., Doyle, F. J., Pinsker, J. E., Maahs, D. M., Buckingham, B. A., & Dassau, E.
Affiliations
  • University of California, Santa Barbara (US)
  • Stanford Medicine (US)
  • University of Colorado Anschutz (US)
  • Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes, Stanford University, Stanford, California.
  • Harvard University (US)
  • Sansum Diabetes Research Institute (US)
Corresponding author
Dassau, Eyal
Venue
Diabetes Technology & Therapeutics
Published
2017-06
Volume
19
Issue
6
Pages
331-339
ISSN
  • 1520-9156 (ISSN-L)
  • 1557-8593
OpenAlex
W2610632420
Cited by
64
References
34
Citations by year
2026: 1 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 4 · 2021: 6 · 2020: 9 · 2019: 13 · 2018: 14 · 2017: 5 · 2016: 1
FWCI
8.87
Type
journal article
Language
en
Open access
Locations
  • Diabetes Technology & Therapeutics (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Virginia
  • Dexcom
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (DP3DK104057, K12DK094712)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Education
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
type 1 diabetes, artificial pancreas, feedback control, adolescents, glycemic control, continuous glucose monitoring, sensor-augmented pump, hypoglycemia, outpatient settings
MeSH terms
Activities of Daily Living, Adolescent, Adolescent Behavior, Algorithms, Child, Child Behavior, Child Nutritional Physiological Phenomena, Combined Modality Therapy, Diabetes Mellitus, Type 1, Feasibility Studies, Female, Food Preferences, Humans, Hyperglycemia, Hypoglycemia, Male, Sports, United States, Cohort Studies, Exercise, Adolescent Nutritional Physiological Phenomena, Pancreas, Artificial

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