Timing of Endurance Exercise and Its Effect on Blood Sugar Levels After Meals in Healthy Adults Aged 18 to 35

What this Trial Is About

Researchers are investigating how the timing of endurance exercise relative to meal intake affects blood sugar levels after eating in healthy, physically active young adults aged 18 to 35. This randomized crossover study aims to understand if exercising before or after breakfast or dinner changes post-meal glucose responses. The study is conducted by the Technical University of Munich and involves wearing continuous glucose monitors to track glucose levels. Participants complete five different conditions within two weeks, including running for 45 minutes outdoors at vigorous intensity either before breakfast, after breakfast, before dinner, after dinner, or not exercising on a control day. All meals are standardized with a high glycemic load and eaten at fixed times 800, 1300, and 1800. Exercise sessions are closely monitored, and environmental factors like temperature and precipitation are recorded. The order of conditions is randomized, and all participants complete all five conditions. During the study, glucose levels are measured for three hours after each of the three consecutive meals following exercise or control days. Participants follow strict routines regarding sleep, caffeine intake, and meal habits before each intervention day to ensure consistency. Researchers collect data on glucose area under the curve, peak glucose levels, time to peak glucose, appetite ratings, and perceived exertion. The total study period per participant is 14 days, with continuous glucose monitoring and adherence checks throughout.

Exercise Timing and Postprandial Glucose Responses