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Carbohydrate Loading Followed by High Carbohydrate Intake During Prolonged Physical Exercise and Its Impact on Glucose Control in Individuals With Diabetes Type 1-An Exploratory Study

Journal article
Authors S. Mattsson
J. Jendle
Peter Adolfsson
Published in Frontiers in Endocrinology
Volume 10
ISSN 1664-2392
Publication year 2019
Published at Institute of Clinical Sciences
Language en
Links dx.doi.org/10.3389/fendo.2019.00571
Keywords blood glucose, carbohydrates, continuous glucose monitoring, insulin, physical activity, time in range, muscle glycogen, performance, metabolism, responses, hypoglycemia, ingestion, fat, Endocrinology & Metabolism
Subject categories Endocrinology and Diabetes

Abstract

Background: Prolonged physical exercise (PE) is a challenge in type 1 diabetes with an increased incidence of both hypoglycemia and hyperglycemia. Purpose: To evaluate the impact of two consecutive days of carbohydrate (CHO) loading, followed by high intermittent CHO-intake during prolonged PE, facilitated by a proactive use of Real-Time Continuous Glucose Monitoring (rtCGM), on glucose control in individuals with type 1 diabetes. Methods: Ten physically active individuals with type 1 diabetes were invited to participate in a 3-day long sports camp with the objective to evaluate CHO-loading and high intermittent CHO-intake during prolonged PE. 1.5 months later the same procedure was evaluated in relation to a 90 km cross-country skiing race (Vasaloppet). Participants were instructed to act proactively using rtCGM with predictive alerts to maintain sensor glucose values within target range, defined as 72-180 mg/dl (4-10 mmol/l). Results: Mean glucose values during CHO-loading were: day 1; 140.4 +/- 45.0 mg/dl (7.8 +/- 2.5 mmol/l) and day 2; 120.6 +/- 41.4 mg/dl (6.7 +/- 2.3 mmol/l). Mean sensor glucose at start of PE was 126.0 +/- 25.2 mg/dl (7.0 +/- 1.4 mmol/l) and throughout PE 127.8 +/- 25.2 mg/dl (7.1 +/- 1.4 mmol/l). Percentage of time spent in range (TIR) respective time spent in hypoglycemia was: CHO-loading 74.7/10.4% and during PE 94.3/0.6%. Conclusions: High intermittent CHO-intake during prolonged PE combined with proactive use of rtCGM is associated with good glycemic control during prolonged exercise in individuals with diabetes type 1. However, the time spent in hypoglycemia during the 2-days of CHO-loading was 10.4% and therefore a lower insulin dose might be suggested to reduce the time spent in hypoglycemia.

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