Umana-Alvarado, M., & Moncada-Jimenez, J. (2004). The effect of an energy drink on aerobic performance in male athletes. Medicine and Science in Sports and Exercise, 36(5), Supplement abstract 1177.

The main purpose of this study was to determine if the intake of a commercially available energy drink before exercise enhances aerobic performance in male athletes. A second aim was to investigate if a specific type of personality relates to the placebo effect. Male athletes (N = 10) competed in two different 10-km cross-country runs. Ss were properly hydrated, and physical activity and eating instructions were given before each test. Ss were fasted and received a standardized breakfast (1 g carbohydrates/kg body mass). Ss were given 6 ml/kg of either an energy drink or a placebo beverage 30 min before the run. Dependent variables measured were run time, perceived exertion, and gastrointestinal symptoms.

No significant differences were found between run times for the two conditions. There was a significant difference in perceived exertion between beverages. No significant associations were found between either drink and gastrointestinal symptoms. No specific type of personality was related to the placebo effect.

Implication. Athletes did not improve their running times but did lower perceived exertion when a commercially-available energy drink was consumed. Personality was not related to the placebo effect.

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