Are there non-responders to caffeine?
Caffeine is one of the most performance enhancing drugs available to athletes, with research demonstrating that it has ergogenic effects on a range of exercise types, including aerobic endurance, strength, and repeated anaerobic activities. Athletes are of course aware of this, and research tends to suggest that around three-quarters of athletes utilise caffeine either immediately before or during competitions. But new research indicates that the effects are not as general as you may think, and could have no effect or even harm performances for some athletes. Read more