Acute Effects of Caffeine on Repeated Sprint Performance and Energy Distribution (NCT07596511) | Clinical Trial Compass
CompletedNot Applicable
Acute Effects of Caffeine on Repeated Sprint Performance and Energy Distribution
Turkey (Türkiye)15 participantsStarted 2025-04-15
Plain-language summary
The goal of this study is to learn if low-dose caffeinated coffee improves repeated sprint performance and affects energy system contributions in combat sports athletes.
The main questions it aims to answer are:
* Does low-dose caffeinated coffee (1.5 or 3 mg·kg-¹) improve peak power, mean power, and fatigue index during repeated sprint tests?
* What physiological responses (heart rate, blood lactate, perceived exertion, and energy system contributions) do participants have when consuming caffeinated coffee? Researchers compared caffeinated coffee at two doses (1.5 and 3 mg·kg-¹ body mass) to a placebo (decaffeinated coffee of identical taste and appearance) to see if low
Who can participate
Age range
18 Years – 25 Years
Sex
MALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Male combat sports athletes aged 18 to 25 years
* Minimum of five years of continuous structured training
* Competitive experience at both regional (state) and national levels
* Willingness to abstain from all caffeinated products for two weeks prior to and throughout the study period
* Ability to follow a standardized dietary protocol prescribed by an Olympic Preparation Center dietitian
* Provision of written informed consent
Exclusion Criteria:
* Age below 18 years
* Self-reported use of anabolic agents, hormonal modulators, or performance-influencing dietary supplements within the three months preceding enrollment
* Current use of narcotic, psychotropic, stimulant medications, or tobacco products during the assessment period
* Presence of any diagnosed medical condition (including cardiovascular, metabolic, neurological, respiratory, or musculoskeletal disorders) that may compromise safe participation
* Withdrawal from the study at the participant's own request
Questions worth asking your doctor
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.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
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.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Peak Power Output
Timeframe: On 3 testing days with 48-hour interval
2
Mean Power Output
Timeframe: On 3 testing days with 48-hour interval
3
Fatigue Index
Timeframe: On 3 testing days with 48-hour interval