Reproducibility of Acute Caffeine Effect

Inclusion Criteria: * Age between ≥ 18 and ≤ 35 years. * Body Mass Index (BMI) \< 25 kg/m². * Resistance-trained individuals (\> 2 years of structured trained). * Healthy men and women without neurological, cardiometabolic, immunological, or physical conditions that prevent them from exercising. * Participants must be able to perform the tests described in the following section. Exclusion Criteria: * History of neuromuscular diseases, heart diseases, or diseases that may affect liver or muscle metabolism. * Use of drugs, other stimulants or sport supplements that interfere with the the study dietary supplement. * Sedentary habits (\<150 min/week of moderate exercise). * Having undergone prolonged periods of forced physical inactivity during the 6 months prior to the study. * Performing strenuous exercise during the 48 hours prior to the tests. * Failure to replicate the same food intake on the two days of the experiments. * Consuming caffeine or any other stimulant after 6 pm the day before the training or tests, to avoid headaches, discomfort, or lethargy among regular caffeine consumers.