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Physiological reaction and mental stress test results after consumption of energy beverages

BACKGROUND: Most studies show positive effects of energy drinks on memory and concentration. Because of these effects of energy drinks on human body, such as improvement of the emotional status, stimulation of metabolism and better concentration, students often consume these beverages. The aim of this study was to indicate physiological effects of energy drinks on the frequency of heart rate, blood pressure and blood glucose levels, and also to demonstrate changes in response to mental stress test. METHODS: The study included 29 students of Medical Faculty in Osijek, aged 18- 24 years, who have not consumed alcohol or energy drinks one week before testing. Participants were self- control, comparing the parameters obtained by testing before and after consuming an energy drink. Respondents were extracted a sample of venous blood, from which blood glucose concentration was determined. Participants were also measured blood pressure and pulse rate as the average value of three consecutive measurements. After these measurements they accessed the mental stress test, and fulfillment of psychological questionnaires on emotional status. Next, these tests subjects were given 500 ml of energy drink, after which they rested again for 30 minutes in lying position. After consumption of energy drinks measurements and tests were repeated. The data was statistically analyzed using SigmaPlot 11.2 statistical software. RESULTS: Before consumption of the energy drink the average value of mean arterial pressure was (82.83 ± 9.67 mmHg). After ingestion of energy drink value of mean arterial pressure increased to (85.31 ± 8.59 mmHg). Thus, there is a statistically significant change in blood pressure after the consumption of energy drinks (p = 0.037). Also, there was a significant change in heart rate frequency. Before consumption the average frequency of the heart rate was (71.31 ± 10.01) and after the consumption of energy drink value of heart rate increased to (76.07 ± 10.68). There is a statistically significant change in heart rate frequency (p = 0.001). The average value of glucose in venous blood also increased from (4.54 ± 0.36 mmol / L) to (7.026 ± 1.357 mmol / L). There is a statistically significant change in glucose after consumption of energy drinks (p = <0.001). Results of mental stress test (which was arithmetic test) increased after drinking energy drink. Average score on the arithmetic test before consumption was (146.56 ± 50.73) and after consumption average result was (189.31 ± 48.03). CONCLUSIONS: Ingestion of energy drinks increases some physiological parameters. Research results show a significant increase in mean arterial pressure and increased frequency of heart rate after consuming the energy drink, because of sympathetic activation. Due to fact that one of the important ingredients of energy drink is glucose, increased glucose levels were expected after consumption of energy drink. Mental stress test results were also improved, due to active substances that energy drinks contain.

Energy beverages ; Mental stress test ; Physiological reactio

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