Effects of energy drink major bioactive compounds on the performance of young adults in fitness and cognitive tests: a randomized controlled trialReport as inadecuate




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Journal of the International Society of Sports Nutrition

, 11:44

First Online: 07 November 2014Received: 09 April 2014Accepted: 19 August 2014

Abstract

BackgroundThe consumption of beverages containing caffeine and taurine before exercising has been associated with increased physical and psychological performances and has been promoted to support the emotional state and provide vitality to consumers. However, there are contradictory results on these issues, it is not clear the effect of every major compound in relation to the whole effect of the beverages and there is a lack in knowledge about their degree of safety for consumption.

MethodsThis study used a double-blind, placebo controlled, randomized, crossover design. Fourteen male volunteer soldiers from the Colombian army performed different tests to measure their cardiorespiratory fitness VO2max and maximum heart rate, time to exhaustion, strength isometric strength, power vertical jump, concentration Grid test and memory Digits test after drinking 250íml of one of the following beverages: one with 80ímg caffeine, one with 1000ímg taurine, one with 80ímg caffeine plus 1000ímg taurine, a commercial energy drink Red Bullí or a placebo drink. Subjects were caffeine-consumers that avoided caffeine during the day of evaluation. All beverages were matched in flavor and other organoleptic properties to the commercial one, were bottled in dark plastic bottles and were administered in identical conditions to the participants. Differences between treatments were assessed using repeated measures and analysis of variance.

ResultsThe mean í SD values of VO2max, maximum heart rate, time to exhaustion, right handgrip strength, left handgrip strength, vertical jump, Grid test and Digits test were 61.3 í 6.2íml-kg.min, 196 í 6.8 beats per min, 17 í 1.2ímin, 56.8 í 6.6íkgf, 53.1 í 5.9íkgf, 41.1 í 3.8ícm, 19.9 í 5.9 observed digits and 10.9 í 3.1 remembered digits after drinking a placebo drink. Comparisons among the commercial drink, caffeine, taurine, caffeine plus taurine and placebo treatments did not show statistically differences in the results of the performed tests. No adverse effects were reported by the participants.

ConclusionThe consumption of caffeine 80ímg and taurine 1000ímg or their combination does not increase the physical and cognitive ability in young adults during exercise.

KeywordsEnergy drink Caffeine Taurine Physical condition Cognitive ability AbbreviationsDigitsdigit span WAIS subtest

Gridfocused attention test

GPAQGlobal Physical Activity Questionnaire

HRmaxmaximum heart rate

LHSleft handgrip strength

METmetabolic equivalent

RHSright handgrip strength

TTEtime to exhaustion

VJvertical jump

VO2maxmaximum oxygen consumption

WAISWechsler Adult Intelligence Scale

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Author: Maximiliano Kammerer - Jaime A Jaramillo - Adriana García - Juan C Calderín - Luis H Valbuena

Source: https://link.springer.com/







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