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Study aim
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Identifying the best dose of caffeine for maximum effect on the performance of athletes and non-athletes and preventing excessive and unnecessary caffeine consumption.
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Design
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The study with within-group, counterbalanced and double-blind design, 16 subjects will consume different doses of caffeine and placebo in four sessions and complete the same test.
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Settings and conduct
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In each session (ten-day intervals) with the presence of two subjects in the laboratory of Razi University, each subject is given one of the three studied doses of caffeine or placebo (without the knowledge of the subject and the researcher), by the assistant of the researcher, which is different from the other subject and from the previous and the next session. After warming up, she will complete three 30-second Wingate tests with four-minute rest, and after that, the maximum voluntary contraction of the rectus femoris and latissimus dorsi muscles will be measured during four periods with rest intervals of 5, 10, 15, and 30 minutes. Finally, the effect of each of the three doses of caffeine and placebo on the fatigue index and EMG amplitude of the mentioned muscles, each subject will be compared with himself and other subjects.
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Participants/Inclusion and exclusion criteria
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Age range 18 to 30 years
Body mass index (BMI) 18.5 to 24.9 kg per square meter of height
Acquaintance and implementation of anaerobic exercises
Obtaining a certificate of non-prohibition of participation in sports training program from the doctor
No use of tobacco, no use of medicine
No vigorous exercise 48 hours before the test
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Intervention groups
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This study is in the form of intragroup and mutual balance, and the subjects will receive three different doses of caffeine and placebo during four sessions in the laboratory.
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Main outcome variables
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Change in anaerobic performance, pressure perception, electromyography, change in recovery time.