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    Placebo Caffeine in Soccer Players: Effects on Physiological Markers and Perceived Sleep Quality
    (Gumushane University, 2024) Güneser, Ezel; Akça, Firat; Yildirim, Ulas Can
    Not all questions regarding the physiological and psychological effects of caffeine have been answered yet. However, it is understood that athletes experience varying effects on physiological markers and sleep quality due to caffeine. This study aimed to examine the alterations in aerobic capacity and perceived sleep quality among football players when exposed to different doses of placebo gum. Twenty-two male players from an amateur football team (average age: 23,36 ± 5,4 years, height: 180,14 ± 6,9 cm; weight: 76,32 ± 10,2 kg; BMI: 23,51 ± 2,8 kg/ m2) participated voluntarily, and the study was designed as a randomized, crossover, single-blind trial. Following the ingestion of placebo gum for 5 minutes, the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT-1) was immediately conducted on the football players. Subsequently, participants were asked about the impact of the gum on their performance after each Yo-Yo IRT-1 trial. The morning after each testing day, the Richard-Campbell Sleep Questionnaire (RCSQ) and Karolinska Sleepiness Scale (KSS) were administered to all participants to assess potential changes in their sleep patterns. Ultimately, no significant differences were observed in aerobic capacity and sleep quality data when the placebo was utilized. Consequently, it can be concluded that placebo caffeine did not affect the perceived sleep quality or aerobic capacity among amateur football players.