Journal
JOURNAL OF DIABETES SCIENCE AND TECHNOLOGY
Volume -, Issue -, Pages -Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/19322968231186401
Keywords
activity tracking; continuous glucose monitoring type 1 diabetes; exercise; nocturnal hypoglycemia; smartphone
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Daytime physical activity increases the risk of nocturnal hypoglycemia in people with type 1 diabetes, and this risk can be assessed using a smartphone-based step tracker.
Background: Nocturnal hypoglycemia (NH) remains a major burden for people with type 1 diabetes (T1D). Daytime physical activity (PA) increases the risk of NH. This pilot study tested whether cumulative daytime PA measured using a smartphone-based step tracker was associated with NH. Methods: Adults with T1D for & GE; 5 years (y) on multiple daily insulin or continuous insulin infusion, not using continuous glucose monitoring and HbA1c 6 to 10% wore blinded Freestyle Libre Pro sensors and recorded total daily carbohydrate (TDC) and total daily dose (TDD) of insulin. During this time, daily step count (DSC) was tracked using the smartphone-based Fitbit MobileTrack application. Mixed effects logistic regression was used to estimate the effect of DSC on NH (sensor glucose <70, <54 mg/dl for & GE;15 minutes), while adjusting for TDC and TDD of insulin, and treating participants as a random effect. Results: Twenty-six adults, with 65.4% females, median age 27 years (interquartile range: 26-32) mean body mass index 23.9 kg/m(2), median HbA1c 7.6% (7.1-8.1) and mean Gold Score 2.1 (standard deviation 1.0) formed the study population. The median DSC for the whole group was 2867 (1820-4807). There was a significant effect of DSC on NH episodes <70 mg/dl. (odds ratio 1.11 [95% CI: 1.01-1.23, P = .04]. There was no significant effect on NH Conclusion: Daily PA measured by a smartphone-based step tracker was associated with the risk of NH in people with type 1 diabetes.
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