The acute effects of two energy drinks on endurance performance in female athlete students

Kazemi, Fahimeh; Gaeini, Abbas Ali; Kordi, Mohammad Reza; Rahnama, Nader

doi:10.1007/s11332-009-0077-7

Cited by 7 publications

(12 citation statements)

References 17 publications

(25 reference statements)

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“…However, heart rate and blood lactate showed no significant differences between the 2 groups. 27 A similar observation was also seen in another study, 20 which examined 17 female athlete students, but in this study the heart rate was increased post exercise in the EDG. Although both studies used similar protocols to our study, the subjects were athletes and the doses for energy drinks were greater than we used, which might influence the results.…”

Section: Discussionsupporting

confidence: 77%

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Effect of energy drink intake before exercise on indices of physical performance in untrained females

Al-Fares

Alsunni

Majeed

et al. 2015

SMJ

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Objectives:To determine the effect of energy drink consumption before exercise on indices of physical performance in untrained females.Methods:This single blind placebo controlled experimental study was carried out at the Physiology Department, University of Dammam, Dammam, Kingdom of Saudi Arabia from September 2011 to May 2012, on 32 healthy female students, in a crossover design. They were given either a standardized energy drink or the placebo 45 minutes before the exercise. Time to exhaustion and the stages of Bruce protocol achieved were noted. Heart rate, blood pressure, peripheral capillary oxygen saturation, and blood lactate were recorded before and after the exercise. Maximum oxygen consumption (VO2max) was calculated by formula. Paired sample t-test was used for statistics.Results:The mean age was 19.93±0.8 years, mean height 156.40±3.83 cm, and the mean weight 51.73±3.65 kg. Time to exhaustion in the placebo group was 11.67±1.51 minutes and 11.41±1.56 in the energy drink group (p<0.157). The VO2max in the placebo group was 34.06±6.62, while it was 32.89±6.83 in the energy drink group (p<0.154). There were no significant differences between the placebo and the energy drinks groups in regards to heart rate, blood pressure, and blood lactate levels, before or after the exercise. However, there were significant differences before, immediately, and 30 minutes post exercise for all parameters between each group.Conclusion:The effects of energy drinks intake on physical performance during the exercise in our small sample does not significantly differ from placebo.

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Section: Discussionsupporting

confidence: 77%

“…Either of these were marked as exhaustion, and time from start of Bruce protocol to exhaustion was called “time to exhaustion”. 20 Maximum oxygen consumption (VO 2 max) was calculated according to the formula VO 2 max=(4.38×T-3.9), where ‘T’ is the recorded ‘time to exhaustion’. 21 …”

Section: Methodsmentioning

confidence: 99%

Effect of energy drink intake before exercise on indices of physical performance in untrained females

Al-Fares

Alsunni

Majeed

et al. 2015

SMJ

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“…Their study also used a double-blind, randomized, crossover design, but was conducted in athletes with a higher VO 2max (54.9 ± 2.3 ml • kg –1 • min –1 ) and employed a time trial format. Kazemi et al [ 32 ] demonstrated that Phantom and Dragon energy drinks also significantly increased TTE vs. placebo by 9.3% and 6.5% respectively during a Bruce treadmill test.…”

Section: Discussionmentioning

confidence: 99%

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

Nelson

Biltz

Dengel

2014

Journal of the International Society of Sports Nutrition

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BackgroundCurrently, 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).MethodsThe 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.ResultsResting 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.ConclusionAlthough 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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“…Energy drinks represent the fastest growing segment of the US beverage market, with annual sales nearing $9 billion . These beverages are often specifically marketed towards extreme sport activities popular among young males as products that will improve energy, promote athletic performance, increase stamina, enhance weight loss, and improve concentration . Manufacturer logos are prominently displayed on snowboards and skateboards of athletes at the X‐Games and winter Olympics as well as on race cars at NASCAR events.…”

Section: Introductionmentioning

confidence: 99%

“…Proponents claim that energy drinks improve athletic performance . Given that the primary active ingredient in most energy products is caffeine, this is expected, since caffeine is a known ergogenic aid for endurance and anaerobic activities . Despite the possible benefits of caffeine, a number of concerns have been noted for energy beverages.…”

Section: Introductionmentioning

confidence: 99%

Energy drink and energy shot use in the military

et al. 2014

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Use of energy drinks and energy shots among military personnel is controversial. High amounts of caffeine (the primary active ingredient in these products) may impact performance of military duties. The impact of caffeine overconsumption and potential subsequent side effects that might be experienced by service members with unique roles and responsibilities is a concern. Reported here are the prevalence of use, reasons for use, and side effects associated with consumption of energy drinks and energy shots among several populations of active duty personnel in the US military. A snowball survey was sent to over 10,000 active duty personnel. A total of 586 (∼6% response rate) individuals completed a 30-item electronic survey. Over half of respondents (53%) reported consuming an energy drink at least once in the past 30 days. One in five (19%) reported energy shot consumption in the prior 30 days. One in five (19%) also reported consuming an energy drink in combination with an alcoholic beverage. Age and gender were significantly associated with energy drink consumption. Young male respondents (18-29 years) reported the highest use of both energy drinks and energy shots. Among those reporting energy drink and energy shot use, the most common reasons for consumption were to improve mental alertness (61%) and to improve mental (29%) and physical (20%) endurance. Nearly two-thirds (65%) of users self-reported at least one side effect. The most commonly reported side effects included increased pulse rate/palpitations, restlessness, and difficulty sleeping. Use of energy products among military personnel is common and has the potential to impact warrior health and military readiness.

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The acute effects of two energy drinks on endurance performance in female athlete students

Cited by 7 publications

References 17 publications

Effect of energy drink intake before exercise on indices of physical performance in untrained females

Effect of energy drink intake before exercise on indices of physical performance in untrained females

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

Energy drink and energy shot use in the military

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