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IMPACT OF A CAFFEINE-BASED ENERGY DRINK ON FAT OXIDATION AND CYCLING PERFORMANCE IN ACTIVE ADULTS

Abstract

PURPOSE: This study assessed the effects of a 200 mg caffeine-based energy drink on fat oxidation rates and cycling time trial (TT) performance. METHODS: Fifteen healthy, physically active participants (11 M, 4 F; 31 ± 7 years, 173.87 ± 8.90 cm, 80.63 ± 9.38 kg, 26.66 ± 2.43 kg/m2) completed a randomized, double-blind, crossover study. Participants attended two sessions, consuming a beverage containing 200 mg of caffeine (CAF) or placebo (PLA) 30 minutes before 45 minutes of cycling at 60% VO2Peak, with gas exchange data collected every 5 minutes to evaluate energy expenditure (EE) and fat oxidation followed by a 15-minute TT on a cycle ergometer. Visual analog scales (VAS) for energy and fatigue were recorded at baseline, 15 minutes post-supplementation, immediately post-TT, and 60 minutes post-TT. Ratings of perceived exertion were recorded before and after 45 minutes of cycling and after 15-minute TT. RESULTS: Group x time interaction for fat oxidation were not significant (p=0.587). However, CAF showed a trend toward increased fat oxidation over time (p=0.086), though post-hoc tests revealed no significant time-point differences. EE increased over time in both groups (p

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