|XS Energy Drink. 0 sugar, only 83mg caffeine. |
Probably tasty, but not ergogenic.
Supported by an independent research grant, K.M. Sheehan and L.K. Hartzler from the Department of Biological Sciences at Wright State University, Dayton, OH, USA, investigated in a double-blind cross-over study protocol (Sheehan. 2011) the effect of a single serving of XS® Energy Drink on subsequent exercise performance of 12 athletes (sex: 9m, 3f; age: 18-24 y) in a modified Ellestad Treadmill protocol and found:
Vo2max (p=0.99), time to muscle fatigue (p=0.48), maximum heart rate (p=0.66), [minute ventilation max] VEmax (p=0.10), time at which [respiratory exchange ratio] RER is greater than 1 (p=0.50), or recovery time to one half Vo2max (p=0.67) were not significantly different with ingestion of XS® Energy Drink over placebo.Accordingly, the conclusion of the scientists, that "[e]ven with all sources of error taken into account it is still not likely that acute consumption of XS® Energy Drink, in the amount used in this experiment, has an advantageous performance effect" is valid for the whole spectrum of effect sizes from XS as in eXtra Small to XS as in eXceSsive ;-)
In view of some of the proclaimed ergogenics in the drink and the load of B-Vitamins having a possible effect on cognitive performance, as well, I would really like to see a study into these effects of this drink. Maybe, this is where the XS® Energy Drink produces eXceSsive results, after all.