ResultsĪ significant interaction effect was identified for EE ( p < 0.001, η P 2 = 0.52) but not respiratory exchange ratio ( p = 0.17, η P 2 = 0.11). Estimates of effect size were quantified via partial eta squared (η P 2) and Hedge’s g. Multiple repeated measures ANOVAs with Tukey post-hoc tests were used to analyze data. In addition, participants’ subjective feelings of energy, fatigue, and focus as well as muscular performance (leg press one-repetition maximum and repetitions to fatigue, maximal isometric and isokinetic squat testing) were assessed. ![]() ![]() Following a familiarization visit, participants completed two identical visits to the laboratory separated by 5–10 days, each of which consisted of indirect calorimetry energy expenditure (EE) assessments before and after consumption of the beverage (Bang® Keto Coffee 130 kcal, 300 mg caffeine, 20 g protein) or placebo (30 kcal, 11 mg caffeine, 1 g protein) as well as after exercise testing. Thus, the purpose of this study was to determine the effects of a commercially available caffeine- and protein-containing energy drink on metabolism and muscular performance. However, limited information is available regarding the efficacy of these products. Energy drinks are often consumed by the general population, as well as by active individuals seeking to enhance exercise performance and augment training adaptations.
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