Energy drinks have the effects that caffeine and sugar provide, but experts still argue about the possible effects of the other ingredients. Most of the effects of energy drinks on cognitive performance, such as increased attention and reaction speed, are primarily due to the presence of caffeine. There is evidence that energy drinks can increase mental and athletic performance. Performance during prolonged driving is increased after consumption of Red Bull. Other tests for physical performance showed results such as increased endurance and power. Red Bull energy drink increased upper body muscle endurance during repeated Wingate tests in young healthy adults. Excessive or repeated consumption of energy drinks can lead to cardiac and psychiatric conditions.