Abstract
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 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 min) 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.
Highlights
Some energy drink manufacturers claim that their products can increase athletic performance
There are no studies to assess the effect of these energy drinks on oxygen consumption (VO2) or ratings of perceived exertion (RPE) during exercise
Energy drinks do not appear to improve perceived treadmill exercise performance nor running economy assessed via oxygen consumption at 70% treadmill exercise
Summary
Some energy drink manufacturers claim that their products can increase athletic performance. 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
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