Beyond the Finish Line: Acute Glucose Response is Linked with Aerobic Fitness

Beyond the Finish Line: Acute Glucose Response is Linked with Aerobic Fitness

Abstract

Acute high-intensity physical exercise can affect blood glucose levels even in healthy individuals, depending on exercise intensity and duration, training status, and metabolic adaptations. Changes in glucose during exercise may reflect differences in energy metabolism capacity and hormonal response [1]. The aim of this study was to determine whether an increase in glucose during a maximal graded exercise test is associated with aerobic fitness (VO₂max) and glucose variability in the previous and following days. Thirty-three healthy recreational and competitive athletes, aged 18–50 years, wore a continuous glucose monitoring device (Dexcom G7, recording glucose level every 5 minutes) for 10 days. During the monitoring period, they completed a graded exercise test to exhaustion (5 min warm-up, workload increased every 2 min, 5 min cooldown, total duration 20–30 min), and VO₂max was established. Data for VO₂max calculation were measured continuously with a gas analyzer MetaLyzer 3B (Cortex, Germany). The criterion of reaching VO₂max was respiratory exchange ratio (RER) above 1.1. The glucose difference between two time points: 10 min after the test and 10 min before the test was calculated, accounting for the delay between interstitial and plasma glucose levels. Furthermore, the coefficient of variation was calculated for the day before the test, the day of the test, and the first and second days after the test. Participants were divided into two groups: 1) glucose increase

Acute high-intensity physical exercise can affect blood glucose levels even in healthy individuals, depending on exercise intensity and duration, training status, and metabolic adaptations. Changes in glucose during exercise may reflect differences in energy metabolism capacity and hormonal response [1]. The aim of this study was to determine whether an increase in glucose during a maximal graded exercise test is associated with aerobic fitness (VO₂max) and glucose variability in the previous and following days. Thirty-three healthy recreational and competitive athletes, aged 18–50 years, wore a continuous glucose monitoring device (Dexcom G7, recording glucose level every 5 minutes) for 10 days. During the monitoring period, they completed a graded exercise test to exhaustion (5 min warm-up, workload increased every 2 min, 5 min cooldown, total duration 20–30 min), and VO₂max was established. Data for VO₂max calculation were measured continuously with a gas analyzer MetaLyzer 3B (Cortex, Germany). The criterion of reaching VO₂max was respiratory exchange ratio (RER) above 1.1. The glucose difference between two time points: 10 min after the test and 10 min before the test was calculated, accounting for the delay between interstitial and plasma glucose levels. Furthermore, the coefficient of variation was calculated for the day before the test, the day of the test, and the first and second days after the test. Participants were divided into two groups: 1) glucose increase

glucose; graded exercise test; VO2max; glucose variability; continuous glucose monitoring; CGM

glucose; graded exercise test; VO2max; glucose variability; continuous glucose monitoring; CGM

ŠACLOVÁ, L.; NĚMCOVÁ, A.; HYKOVÁ, K.; GOLDSCHMIDT, T.; SMITAL, L.; CHLÍBKOVÁ, D.; KRÁLÍK, M.; SMÍŠEK, R.; JAROŠ, O.; HUBÁLEK, J.

Vysoká škola báňská – Technická univerzita Ostrava

Ostrava

978-80-248-4828-0

Setkání vysokoškolských pracovišť v rámci konference Trendy v biomedicínském inženýrství 2025 a řešitelů projektu LERCO

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