The Kruskal-Wallis test was used to determine changes in the development of the urine caffeine content within each sport. Due to the non-normal distribution of the urine caffeine levels, non-parametric statistics were later used. Crosstab and Chi-Square tests, along with adjusted normalised residuals, were used to examine the variations in sample distribution among ranges of urine caffeine content.
One amongst the most popular drugs used by athletes to improve their performance in competition is caffeine (1,3,7-trimethylxanthine).
Evidence suggests that a variety of administration methods, including capsules/tablets, caffeinated drinks (such as energy drinks and sports drinks), liquids (such as coffee), and chewing gum, can be used to receive caffeine performance-enhancing characteristics.
However, due to the widespread availability of these goods on the market, caffeinated beverages have taken over as the primary method of caffeine administration in sports.
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