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Abstract

This study evaluates the effects of ZOA Energy Drink, a commercially available energy beverage, on muscular strength, sustained attention, and mood in exercise-trained individuals. Using a randomized, blinded, two-arm design, 24 participants (15 males, 9 females; age = 31.8 ± 8.4 years) were assigned to consume either ZOA Energy Drink or a caffeine-matched placebo. The primary outcomes included psychomotor vigilance (PVT), mood state (POMS), handgrip strength, and push-up performance. Baseline body composition was also assessed using bioelectrical impedance.

Results revealed no statistically significant differences between the ZOA and the caffeine matched control groups in psychomotor vigilance (p = 0.155), mood disturbance scores (p = 0.490), handgrip strength (p = 0.780), or push-up performance (p = 0.713). However, slight within-group improvements in psychomotor vigilance and mood were observed for the ZOA group, indicating potential minor benefits attributable to caffeine and other bioactive compounds.

In conclusion, there were no differences between the energy drink versus caffeine-matched control. The evidence from the current investigation suggests that caffeine is the primary driver of any benefit(s) derived from energy drinks.

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