The Impact of Caffeine Supplementation on Muscular Strength and Endurance in Male Bodybuilders

The aim of this study was to investigate the effect of caffeine supplementation on the strength and muscular endurance of female bodybuilders. The statistical population of this study consisted of active men in bodybuilding clubs in Tehran, of whom 15 were selected voluntarily, purposefully and conveniently as a sample and were randomly assigned to a control group, placebo group and supplement group at an interval of 3 days from each other in a crossover manner. They participated in one-repetition (1RM) maximum leg press tests to measure muscular strength and repetitions to exhaustion of leg press movements to measure muscular endurance. One-way analysis of variance test was used to analyze the data and examine the mean difference between the groups, and if significant, Bonferroni test was used. The results of the study showed that consuming 5 mg of caffeine supplementation per kilogram of body weight increased muscular strength and endurance in bodybuilders. As a result, it appears that caffeine consumption (5 mg per kilogram of body weight), which is approximately equivalent to 2 or 3 cups of coffee per day, can lead to increased maximal strength and muscular endurance in strength athletes.