Study of How Caffeine and Green Tea Extracts in an Energy Drink Affect Fat Burning Before, During, and After Exercise for Adults Aged 18 to 45

What this Trial Is About

Researchers are investigating whether drinking an energy drink containing caffeine and green tea extract before exercise can increase fat burning compared to a placebo drink. This study focuses on healthy, moderately active adults aged 18 to 45 and uses a double-blind, randomized, crossover design to compare effects during rest, exercise, and recovery periods. The study aims to understand how these ingredients influence fat oxidation during endurance cycling. Participants will attend three clinic visits over 3 to 5 weeks. The first visit determines their individual exercise intensity for maximizing fat use during cycling. In two later visits, participants will consume either two cans of the active energy drink or two cans of a placebo drink without caffeine and green tea extract before completing a 30-minute cycling session at their personalized exercise level. The study compares the effects of these drinks on fat and carbohydrate use and other physiological responses. During each visit, measurements will include fat oxidation, carbohydrate oxidation, respiratory exchange ratio, heart rate, blood pressure, and subjective responses, all assessed from baseline through 30 minutes after exercise using indirect calorimetry. Participants will be monitored closely, and the main outcome is fat oxidation from baseline to 30 minutes post-exercise. The total study participation spans three visits within a few weeks, providing detailed data on how caffeine and green tea extract affect metabolism during exercise.

A Study to See if an Energy Drink With Caffeine and Green Tea Increases Fat Burning When Exercising