Caffeine is one of the most highly used drugs in the world and is popular as an ergogenic aid for athletes. Although it has been removed from the International Olympic Committee banned substance list, caffeine consumption is still monitored in competitive athletes.
A study was conducted, and published in the Journal of Strength and Conditioning Research that looked at the effects of caffeine on strength, muscular endurance and anaerobic activity. The research showed caffeine did not have an effect on lower-body strength, muscular endurance, anaerobic capabilities or upper body muscular endurance.
The study did show that drinking a moderate dose of caffeine approximately 1 hour prior to activity resulted in an increase in upper-body strength in resistance-trained men.