IRCT20231004059615N1 IRCT 2023-11-08 Islamic Azad University Effect of HIT and caffeine supplementation on exercise performance and adaptations The effect of high-intensity interval training and caffeine supplementation on exercise adaptations and ergogenicity of acute caffeine intake in young men 2023-11-06 anticipated 80 Complete https://irct.ir/trial/72996 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Basic scienece, Randomization description: To minimize possible group differences, first, the participants were categorized according to age, body mass, and V̇O2max. Then, the subjects of each category were randomized on a 1:1:1:1 basis to one of four groups: caffeine supplementation, caffeine supplementation + exercise training, placebo and placebo + exercise training, Blinding description: Preparation of the supplement/placebo was done by someone outside the study. Also, all participants received capsules containing caffeine/placebo in the same appearance and weight for the same duration and frequency. In addition, for statistical analysis, the titles of the groups were not clear and only the numbers 1 to 4 were assigned to the groups. 4 Caffeine habituation. Intervention 1: The first intervention group included the caffeine consumption group, which consumed caffeine supplement (3 mg/kg/day) for 8 weeks. Intervention 2: The second intervention group included the exercise training group that performed the high-intensity interval training program 5 sessions per week for 8 weeks. Intervention 3: The third intervention group received a combination of exercise training and caffeine supplementation. They followed a high-intensity interval training program and took caffeine supplements for 8 weeks. Intervention 4: The fourth group was the control group that did not participate in exercise training and received a daily capsule containing 200 mg of cellulose. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is After publishing the articles extracted from the research project, the data will be published.