The subjects were not allowed to swallow the drinks and thus took no additional calories. But already rinsing with the two sugary variants led to a significant increase in performance: The athletes completed the course faster, without feeling strained.
Since only the sugary drinks improved performance, the researchers concluded that the taste was the cause of the increase. To find out more about the exact mode of action, they used functional magnetic resonance imaging (fMRI) to visualize the athlete's brain activity. Shortly after the energy drinks entered the subjects' mouth, brain regions became active, which were responsible for reward and motor skills.
As a result, the subjects perceive the effort as less than it actually is, the researchers conclude. The observations suggest specific carbohydrate receptors in the mouth and also support the so-called central governor theory: According to this not limit muscle, heart or lung performance, but especially the brain. displayEdward Chambers (University of Birmingham) et al .: Journal of Physiology, online publication doi: 10.1113 / jphysiol.2008.164285 Journal of Physiology ddp / science.de? Masha's shaft