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Evaluation of Factors Related to Glycemic Management in Professional Cyclists With Type 1 Diabetes Over a 7-Day Stage Race

Sam N. Scott, Mark P. Christiansen, Federico Y. Fontana, Christoph Stettler, Richard Bracken Orcid Logo, Charlotte A. Hayes, Miles Fisher, Bruce Bode, Peter H. Lagrou, Phil Southerland, Michael C. Riddell

Diabetes Care, Volume: 43, Issue: 5, Pages: 1142 - 1145

Swansea University Author: Richard Bracken Orcid Logo

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DOI (Published version): 10.2337/dc19-2302

Abstract

OBJECTIVE To investigate factors related to glycemic management among members of a professional cycling team with type 1 diabetes over a 7-day Union Cycliste Internationale World Tour stage race.RESEARCH DESIGN AND METHODS An observational evaluation of possible factors related to glycemic managemen...

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Published in: Diabetes Care
ISSN: 0149-5992 1935-5548
Published: American Diabetes Association 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55188
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Abstract: OBJECTIVE To investigate factors related to glycemic management among members of a professional cycling team with type 1 diabetes over a 7-day Union Cycliste Internationale World Tour stage race.RESEARCH DESIGN AND METHODS An observational evaluation of possible factors related to glycemic management and performance in six male professional cyclists with type 1 diabetes (HbA1c 6.4 ± 0.6%) during the 2019 Tour of California.RESULTS In-ride time spent in euglycemia (3.9–10.0 mmol/L glucose) was 63 ± 11%, with a low percentage of time spent in level 1 (3.0–3.9 mmol/L; 0 ± 1% of time) and level 2 (<3.0 mmol/L; 0 ± 0% of time) hypoglycemia over the 7-day race. Riders spent 25 ± 9% of time in level 1 (10.1–13.9 mmol/L) and 11 ± 9% in level 2 (>13.9 mmol/L) hyperglycemia during races. Bolus insulin use was uncommon during races, despite high carbohydrate intake (76 ± 23 g ⋅ h−1). Overnight, the riders spent progressively more time in hypoglycemia from day 1 (6 ± 12% in level 1 and 0 ± 0% in level 2) to day 7 (12 ± 12% in level 1 and 2 ± 4% in level 2) (χ2[1] > 4.78, P < 0.05).CONCLUSIONS Professional cyclists with type 1 diabetes have excellent in-race glycemia, but significant hypoglycemia during recovery overnight, throughout a 7-day stage race.
College: Faculty of Science and Engineering
Issue: 5
Start Page: 1142
End Page: 1145