Figure 1.

Experimental design of the investigation. Participants underwent a strength training protocol consisting of 12 training sessions in the bench press exercise for 4 weeks. During the first 2 weeks, participants performed 4 sets of 10 repetitions at 60% 1RM and in the last 2 weeks they performed 4 sets of 8 repetitions at 70% 1RM. Before each training session, nine participants ingested a capsule containing 3 mg/kg/BM of caffeine (A) and seven participants ingested a capsule containing a placebo (B). Just before and after the strength training protocol, participants performed a one-repetition maximum test in the bench press exercise and a force-velocity test using incremental loads.