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- Title
Effects of Caffeine-Containing Energy Drinks on Endurance Performance and Side Effects: A Randomized Cross-Over Study.
- Authors
M. H., Bäcker; T., Jaitner
- Abstract
› Introduction: After caffeine consumption of 3-6 mg/kg, significant increases in endurance performance have been observed in studies, with various side effects occurring. The aim of this study is to analyse whether caffeine intake of 2 mg/kg increases endurance performance while avoiding side effects. › Methods: In two sessions, 13 women and 19 men between 20 and 30 years (24.5±1.9 years) took 2mg caffeine/kg in the form of an energy drink or a placebo. After 60 minutes, participants started with an incremental test on a treadmill to exhaustion. Heart rate and oxygen uptake were measured and immediately afterwards they indicated received perceived exertion (RPE). The morning after, the subjects fill out a questionnaire with 24 items (GBB-24) to analyse their health and symptoms. › Results: In comparison to placebo drink, the ingestion of energy drink with 2 mg caffeine/kg increased running time (7:23±1:03 vs. 7:16±1:03 min; p<0.05) and VO˙ 2 max (47.24±6.5 vs. 45.72±6.2 ml O2 /min/kg; p≤0.05). The heart rates during running as well as the RPE and answering the questionnaire items did not provide any statistical differences between energy drink and placebo group. › Conclusion: Thus the ingestion of the energy drink with a dose of 2mg of caffeine/kg did not affect the prevalence of negative side effects but might be an effective ergogenic aid to improve endurance performance.
- Subjects
ENERGY drinks; FATIGUE (Physiology); HEART beat; ERGOGENIC aids; CAFFEINE
- Publication
German Journal of Sports Medicine / Deutsche Zeitschrift fur Sportmedizin, 2023, Vol 74, Issue 6, p214
- ISSN
0344-5925
- Publication type
Article
- DOI
10.5960/dzsm.2023.575