title: Different training status may alter the continuous blood glucose kinetics in self-paced endurance running.
abstract: The main purpose of the systemic energy metabolism is to provide a source of energy, mainly glucose, for the brain; therefore, blood glucose levels would be expected to correlate with exercise performance. The individual training status may also affect the blood glucose levels. The aim of the present study was to assess the association between blood glucose levels and running velocity during prolonged running in athletes with different training statuses. Two female college athletes, a triathlete and a tennis player, ran a course that was 247.4 m in circumference for 5 h while wearing a continuous glucose monitoring system. Blood was obtained at time-points of -1, 1, 3 and 5 h. The athletes had free access to food and fluids throughout the run. The athletes ran at almost the same pace without a sudden decrease in pace. The blood glucose levels increased and remained high in the triathlete, whereas the tennis player remained hypoglycemic throughout the run. Carbohydrate ingestion did not affect the blood glucose levels. The magnitude of hormonal changes, e.g. insulin, adrenaline and cortisol, was greater in the tennis player. The blood glucose concentration did not correlate with the running velocity or the carbohydrate ingestion; however, a discrepancy in blood glucose transition was observed between the triathlete and the tennis player, indicating a possible association between the adaptation to endurance exercise and the blood glucose kinetics during prolonged running.
authors.affiliation: Graduate School of Health and Sports Science, Juntendo University, Inzai, Chiba 270-1695, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Suzuki
authors.affiliation: Faculty of Biomedical Engineering, Toin University of Yokohama, Aoba, Yokohama, Kanagawa 225-8503, Japan.
authors.forename: Tomomi
authors.initials: T
authors.lastname: Shimizu
authors.affiliation: Graduate School of Sports and Health Science, Daito Bunka University, Matsuyama, Saitama 355-8501, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Ota
authors.affiliation: Katsushika Medical Center, Jikei University, Tokyo 125-8506, Japan ; Daisan Hospital, Jikei University, Tokyo 201-8601, Japan.
authors.forename: Ryuzo
authors.initials: R
authors.lastname: Hirata
authors.affiliation: Division of Applied Sciences, Kyoto Prefectural University, Shimogamo, Kyoto 606-8522, Japan ; Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa, Kyoto 606-8502, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Sato
authors.affiliation: Department of Medicine, Metabolism and Endocrinology, School of Medicine, Juntendo University, Tokyo 113-8421, Japan.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Tamura
authors.affiliation: Faculty of Sports and Health Science, Daito Bunka University, Matsuyama, Saitama 355-8501, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Imanishi
authors.affiliation: Tokyo Gakugei University, Tokyo 184-0015, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Watanabe
authors.affiliation: Graduate School of Health and Sports Science, Juntendo University, Inzai, Chiba 270-1695, Japan.
authors.forename: Keishoku
authors.initials: K
authors.lastname: Sakuraba
keywords: continuous glucose monitoring system; glucose; prolonged exercise; running