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Article
Effects of XS® Energy Drink on Aerobic Exercise Capacity of Athletes
International Journal of Exercise Science
  • Kevin M. Sheehan, Wright State University - Main Campus
  • Lynn K. Hartzler, Wright State University - Main Campus
Document Type
Article
Publication Date
1-1-2011
Abstract
A 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.
Comments

Supported by a Wright State University undergraduate research fellowship and a Wright State University Honors Program grant to KMS.

Citation Information
Kevin 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/