This study investigates how different doses of caffeine affect physical and cognitive performance in female handball players. Caffeine is widely used as a performance-enhancing substance, but its effects may vary depending on the type of performance and the dose consumed. In this randomized, double-blind, placebo-controlled crossover study, participants complete three experimental conditions: placebo, low-dose caffeine (3 mg/kg), and moderate-dose caffeine (6 mg/kg). Each participant receives all conditions in a randomized order, with sufficient time between sessions to avoid carryover effects. The study evaluates three main performance domains relevant to team sports. Physical performance is assessed using an intermittent running test. Cognitive performance is measured using a reaction time task that evaluates attention and inhibitory control. In addition, a throwing test is used to assess sport-specific motor performance. The main objective is to determine whether caffeine produces dose-dependent improvements and whether these effects differ across physical, cognitive, and technical performance domains. The findings aim to provide practical insights for athletes and coaches regarding optimal caffeine use in team sport settings.
Age range
18 Years – 25 Years
Sex
FEMALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Flanker Task Reaction Time
Timeframe: During each experimental session (60 minutes after supplementation)
Yo-Yo Intermittent Recovery Test Level 1 Distance
Timeframe: During each experimental session (60 minutes after supplementation)
Throwing Velocity
Timeframe: During each experimental session (60 minutes after supplementation)