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Background: Caffeine is a substance that is consumed regularly by approximately 90% of adults worldwide, primarily to reduce fatigue and increase wakefulness. The benefit of caffeine consumption on athletic performance in large doses (3-9 mg/kg body weight or BW) is well documented in aerobic athletes. However, the benefits of caffeine consumption on resistance training variables such as power are less clear. Purpose: The purpose of this study was to investigate the effect of consumption of 7 mg/kg BW of caffeine on power production in experienced, resistance trained college-aged males, who are habitual caffeine consumers. Methods: Eighteen young and healthy college aged males (aged 21.7 ± 2.0 yrs) were included in this double blind, placebo controlled study. Subjects performed a battery of tests that included a vertical jump (VJ), isometric squat (ISO), and Smith Machine squat (SQF) and bench press (BPF) to failure at 60% 1RM. Subjects consumed either 7 mg/kg body weight (BW) of caffeine or placebo, 60 minutes prior to testing. Test sessions were separated by 7 days. Power production during VJ, SQF and BPF exercises was evaluated. Power obtained during SQF and BPF was used to find the fatigue index (F.I.). Also, force production during an ISO was assessed. A repeated measures ANOVA was used to determine differences between treatments. Significance for all analysis was set at p≤ 0.05. Results: There were no significant differences between treatments in VJ, ISO, SQF, or BPF. Conclusion: Consumption of 7 mg/kg BW of caffeine does not improve measures of force, power, or fatigue during resistance training exercises in habitual caffeine users.

The Effect of Caffeine Supplementation on Muscular Power in Recreationally Trained College Aged Males