Effects of XS® Energy Drink on Aerobic Exercise Capacity of AthletesInternational Journal of Exercise Science
AbstractA small increase in performance is often the difference between winning and losing for athletes, and energy supplements are marketed to give them a competitive edge. One such supplement is XS® Energy Drink which contains B vitamins, caffeine, taurine, and an herbal adaptogen blend. XS® Energy Drink is primarily designed and marketed as an alertness stimulus; however, it is also marketed to athletes as a performance enhancing supplement. The hypothesis of this investigation was that the consumption of XS® Energy Drink before exercise would increase aerobic capacity (an increase in Vo2max) and time to fatigue, and would decrease time for recovery from the exercise bout. Twelve 18-24 year old athletes performed two Vo2max tests following a modified Ellestad Treadmill protocol. Prior to testing, a double-blind cross-over method was used to administer the energy supplement or the placebo. Vo2max (p=0.99), time to muscle fatigue (p=0.48), maximum heart rate (p=0.66), VEmax (p=0.10), time at which R 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. The second trial was significantly longer than the first (p=0.01) likely due to the desire to improve exercise time or familiarization with the testing procedures. Results showed no physiological effects of XS® Energy Drink; however, there is a possibility of psychological advantage.
Citation InformationKevin M. Sheehan and Lynn K. Hartzler. "Effects of XS® Energy Drink on Aerobic Exercise Capacity of Athletes" International Journal of Exercise Science Vol. 4 Iss. 2 (2011) p. 152 - 163 ISSN: 1939795X
Available at: http://works.bepress.com/lynn_hartzler/46/