Caffeine and Exercise: is it safe?

Caffeine is a well-known supplement to enhance performance. These effects have been established at meta-analysis level in numerous studies. The authors from UK and Australia explored some areas where this stimulant performance was not clear: the effects of training status, habitual caffeine use, time of day, age, and sex. As en example, some articles report that 400 mg of caffeine 6h before the bedtime, disrupted sleep quality and reduced the duration. Besides affecting the sleep, caffeine is also shown to modify post-training recovery. Namely, it can reduce the occurrence of delayed onset of muscle soreness. The morning-evening difference in performance quality, and the potential modifying effect of caffeine, is another important consideration. Check the original article for details.