Conclusion
alertness
The findings of this study indicate that acute guarana supplementation leads to significant improvements in both CRT and SRT before and after a maximal bout of exercise, respectively, which is consistent with a heightened feeling of alertness. This improvement, with respect to placebo, is evident in guarana alone, despite a matched dose of caffeine content in the caffeine supplement. These effects appear promising for the use of guarana in sports which require fast response times to be maintained through high intensity physical activity.