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The effect of three different energy drinks on oxygen consumption and perceived exertion during treadmill exercise
© Sanders et al. 2015
- Published: 21 September 2015
- Oxygen Consumption
- Exercise Performance
- Treadmill Exercise
- Time Trial
- Energy Drink
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, VO2 and RPE would likely be reduced during any given exercise intensity.
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 VO2 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.
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.kg-1.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.
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.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.