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Nelson MT, Biltz GR, Dengel DR. Cardiovascular and ride time-to-exhaustion effects of an energy drink. J Int Soc Sports Nutr. 2014;11(1):2doi: 10.1186/1550-2783-11-2.
Nelson, M. T., Biltz, G. R., & Dengel, D. R. (2014). Cardiovascular and ride time-to-exhaustion effects of an energy drink. Journal of the International Society of Sports Nutrition, 11(1), 2. https://doi.org/10.1186/1550-2783-11-2
Nelson, Michael T, et al. "Cardiovascular and ride time-to-exhaustion effects of an energy drink." Journal of the International Society of Sports Nutrition vol. 11,1 (2014): 2. doi: https://doi.org/10.1186/1550-2783-11-2
Nelson MT, Biltz GR, Dengel DR. Cardiovascular and ride time-to-exhaustion effects of an energy drink. J Int Soc Sports Nutr. 2014 Jan 22;11(1):2. doi: 10.1186/1550-2783-11-2. PMID: 24447726; PMCID: PMC3937107.
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J Int Soc Sports Nutr. 2014 Jan 22;11(1):2. doi: 10.1186/1550-2783-11-2.

Cardiovascular and ride time-to-exhaustion effects of an energy drink.

Journal of the International Society of Sports Nutrition

Michael T Nelson, George R Biltz, Donald R Dengel

Affiliations

  1. School of Kinesiology, University of Minnesota, Minneapolis, MN, USA. [email protected].

PMID: 24447726 PMCID: PMC3937107 DOI: 10.1186/1550-2783-11-2

Abstract

BACKGROUND: Currently, there are few studies on the cardiovascular and fatigue effects of commercially available energy drinks. This study investigated the effects of Monster energy drink (Monster Beverage Corporation, Corona, California), on resting heart rate (HR), heart rate variability (HRV), ride time-to-exhaustion, peak exercise HR, respiratory exchange ratio (RER), and peak rating of perceived exertion (RPE).

METHODS: The study used a double-blind, randomized, placebo controlled, crossover design. After an 8-hr fast, 15 subjects consumed Monster Energy Drink (ED standardized to 2.0 mg * kg-1 caffeine) or a flavor-matched placebo preexercise. Resting HR and HRV were determined. After an initial submaximal workload for 30 minutes, subjects completed 10 min at 80% ventilatory threshold (VT) and rode until volitional fatigue at 100% VT.

RESULTS: Resting HR was significantly different (ED: 65+/-10 bpm vs. placebo: 58+/-8 bpm, p = 0.02), but resting HRV was not different between the energy drink and placebo trials. Ride time-to-exhaustion was not significantly different between trials (ED: 45.5+/- 9.8 vs. placebo: 43.8+/-9.3 min, p = 0.62). No difference in peak RPE (ED: 9.1 +/- 0.5 vs. placebo: 9.0 +/- 0.8, p = 1.00) nor peak HR (ED: 177 +/- 11 vs. placebo: 175 +/- 12, p = 0.73) was seen. The RER at 30% of VT was significantly different (ED: 0.94 +/- 0.06 vs. placebo: 0.91 +/- 0.05, p = 0.046), but no difference between the two conditions were seen at the other intensities.

CONCLUSION: Although preexercise ingestion of the energy drink does increase resting HR there was no alteration in HRV parameters. Ride time-to-exhaustion was not enhanced.

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