The effect of three different energy drinks on oxygen consumption and perceived exertion during treadmill exercise
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POSTER PRESENTATION
Open Access
The effect of three different energy drinks on oxygen consumption and perceived exertion during treadmill exercise Gabriel J Sanders1*, Willard Peveler1, Brady Holmer1, Corey A Peacock2 From The Twelfth International Society of Sports Nutrition (ISSN) Conference and Expo Austin, TX, USA. 11-13 June 2015 Background Some energy drink manufacturers claim that their products can increase athletic performance. However, there are no studies to assess the effect of these energy drinks on oxygen consumption (VO2) or ratings of perceived exertion (RPE) during exercise. If these energy drinks improve performance, VO 2 and RPE would likely be reduced during any given exercise intensity. Methods Fifteen (22.1 ± 2.7 years old) participants completed the study. Maximal oxygen consumption (VO2 max) was initially measured to establish each participant’s exercise for the 70% treadmill exercise protocol after ingesting an energy drink. Following VO2 max testing, all participants completed a total of four conditions. Each condition required a participant to ingest an energy drink then rest in a seated position for one hour. Following one hour of rest, participants exercised for a total of 15 minutes on a treadmill at 70% of their VO 2 max. For each condition, participants blindly ingested one of four price-matched beverages (12 oz. placebo (Squirt), 8.4 oz. Red Bull ® , 16 oz. Monster Energy ® , 2 oz. 5-hour ENERGY®). Relative VO2 (ml.kg-1.min-1) and RPE (6-20 Borg Scale) were recorded each minute during the treadmill exercise and averaged in five-minute increments and as an average for each 15-minute condition. Results Analysis of variance revealed there was no significant main effect of energy drinks on average VO2 (placebo 35.8 ± 2.3 ml.kg -1. min -1 ; Red Bull 35.4 ± 2.3 ml.kg -1. min -1 ;
Monster 35.8 ± 2.2 ml.kg-1.min-1; 5-hour 36.5 ± 2.4 ml.kg1. min-1; p ≥ .482) and RPE (placebo 12.2 ± 0.6; Red Bull 12.6 ± 0.5; Monster 12.0 ± 0.5; 5-hour 11.7 ± 0.5; p ≥ .179) during 15 minutes of treadmill exercise.
Conclusions Energy drinks do not appear to improve perceived treadmill exercise performance nor running economy assessed via oxygen consumption at 70% treadmill exercise. Given that no significant reductions were found in VO2 and RPE post energy drink consumption, results do not support manufacturers’ claims regarding their product’s ability to boost performance. Additional research is needed to assess time trial or time to exhaustion sprint and endurance performance. Time trials and time to exhaustion may better assess if these energy drinks can, in fact, improve exercise performance. Authors’ details 1 Northern Kentucky University, Highland Heights, KY, USA. 2Nova Southeastern University, Fort Lauderdale, FL, USA. Published: 21 September 2015
doi:10.1186/1550-2783-12-S1-P1 Cite this article as: Sanders et al.: The effect of three different energy drinks on oxygen consumption and perceived exertion during treadmill exercise. Journal of the International Society of Sports Nutrition 2015 12 (Supp
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