Conclusion
weight loss, alertness
Caffeine-containing products such as pre-workout supplements, energy drinks, and weight loss supplements continue to increase in popularity and are common sources of caffeine in peoples’ diets. It is imperative randomized clinical trials be conducted to determine the safety and efficacy of caffeine-containing thermogenic products. In this regard, no serious side effects were reported after consuming the RTD beverage. Within the context of the present study (male and female resistance-trained and non-resistance-trained college-aged individuals), acute ingestion of an RTD beverage formulation significantly increased REE and feelings of energy, focus, concentration, and alertness without producing negative effects on hemodynamic variables. While the supplement used in the current study could therefore be viewed as safe for acute consumption and effective for increasing metabolic rate for at least 100 minutes post-ingestion, future research is needed to determine effects of chronic consumption. That is, acute increases in energy expenditure or lipolysis may not equate to meaningful reductions in body weight or fat mass over time [