The effect of creatine and/or caffeine ingestion on repeated bouts of high-intensity exercise performance /by Zoltan Andre Torok.

The purpose of this study was to determine what effect caffeine, creatine, or the combination of treatment would have on multiple bouts of high intensity exercise performance. Some research has shown caffeine and creatine to ellict an ergogenic effect on repeated bouts of high-intensity performance, but new research investigating the combination has been done. Subjects were asked to undergo 4 separate treatments (placebo, caffeine only, creatine only, creatine + caffeine) for 9 days and then participate in 2 different experimental conditions; 6 x 6 second Wingate, 6 x 50-meter Track sprints. To determine statistical significance a repeated measure was preformed comparing treatments to sprint, a paired sample t-test was performed to determine during which sprint it had occurred. The primary findings of the study were creatine loading plus acute caffeine ingestion improved peak power and mean power in the 1st and 2nd 6 second Wingate. The ingestion of caffeine only improved 50 m sprint time during the 4th, 5th, and 6th trial over placebo. This is the first study to definitively show that the ergogenic effect of caffeine and/or creatine might be specific to the type of activity performed and the environment in which the supplement is used