Continuous glucose monitoring of a runner during five marathons

Introduction. - Now in the global running boom, many people enjoy full-marathon, from top athletes to city runners. To understand glucose fluctuations during full-marathon would be useful to discuss the running performance and exercise intensity. There is a report concerning the continuous glucose monitoring (CGM) of three runners with type 1 diabetes during full- marathon, and that of two elite runners during 100 km running race. However, there are little CGM data of healthy subjects during full-marathon as far as we know. The purpose of this study is to observe glucose fluctuation during full-marathon by CGM with running performance and exercise intensity. Summary of facts and results. - CGM was performed five times during full-marathon of one same healthy runner and the heart rate and running speed were monitored. Five CGM data during full-marathon were obtained. Three of them showed the flat pattern. One of the left two showed the ascending pattern, in which the glucose level went up to more than 140 mg/dL. The other one showed the descending pattern. The best running performance was observed in the flat pattern. Conclusion. - CGM is a useful tool for monitoring glucose fluctuation during long distance running. These data would be helpful as a pilot study to understand glucose metabolism and performance during endurance exercises. (C) 2018 Elsevier Masson SAS. All rights reserved.