Background: Resistance training practitioners who aimed muscle hypertrophy, strength and power improvements usually ingest many supplements. And caffeine ingestion is very popular
substance among this practitioners. However studies diverge about possible effects of this on resistance exercises. Therefore, this study aimed evaluates effects of previous ingestion of caffeine on
performance of the bench press exercise.
Methods: It was done in a crossover design with 8 male resistance training practitioners average age of 23 (± 3,6) years old, body mass 80,8 (± 8,5) kg, height 1,73 (± 0,04) m and
they have been training for 3,9 (± 2,7) years and non users of supplements or anabolic steroids. All subjects passed through three interventions 1) previous ingestion of caffeine followed by exercises
(Caffeine), 2) previous ingestion of placebo followed by exercises (Placebo), 3) only exercises without supplementation (Control). Experiment was carried out by evaluating 4 stages: 1 repetition
maximum (1RM) at bench press and 3 distinct sessions of these exercises with an interval of seven days between session. Bench press workout consisted of 10 sets of repetitions maximum achieving to
concentric muscle failure intensity of 75% of 1RM. The ingestion of caffeine or placebo (corn starch) occurred 1h before tests.
Results: Total volume (sets x repetitions x weight [Kg]) training showed mean (± standard deviation) 4418,3 (± 635,3) Kg for Control, 4995,75 (± 709,90) Kg for Caffeine and 4864,25 (±
788,54) Kg for placebo. Groups of volunteers who used Caffeine and Placebo did not show significant difference between themselves however volume training increased (p=0,0075) compared to the group
Conclusions: According to results showed by this study no evidences was found that caffeine can be used as an ergogenic aid for enhancing physical performance and further
investigations are needed in order to affirm it. Furthermore, results indicate how important placebo substance is when characterized by positive changes in psychological or physiological effects on
strength training practitioners.