Caffeinated Gum Use and Volleyball Performance (NCT07597265) | Clinical Trial Compass
CompletedNot Applicable
Caffeinated Gum Use and Volleyball Performance
Turkey (Türkiye)11 participantsStarted 2025-08-05
Plain-language summary
This study examined the acute effects of caffeinated chewing gum on volleyball performance in trained female volleyball players. Caffeine is commonly used by athletes to improve performance, but less is known about whether caffeinated gum is useful during volleyball-specific activity.
Participants completed three testing sessions in a randomized crossover design. In one session, they chewed placebo gum. In another session, they chewed caffeinated gum containing a single 300 mg dose of caffeine. In the third session, they received the same total amount of caffeine as three separate 100 mg doses given at 30-minute intervals.
The study assessed volleyball-specific skill performance, including attack, block, and defense efficiency, during a volleyball-specific skill game. Vertical jump height, heart rate, perceived exertion, side effects, and condition guessing were also recorded.
Who can participate
Age range
18 Years – 35 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.
Inclusion Criteria:
* Female volleyball players aged 18 to 35 years.
* Apparently healthy.
* Daily caffeine intake ≤300 mg.
* Minimum of 5 years of regular volleyball training experience.
* Training for at least 120 minutes at least 3 days per week.
* Competing in national or international volleyball matches.
* Provided written informed consent before participation.
Exclusion Criteria:
* Serious injury or trauma within the past 6 months that could affect volleyball performance.
* Illness or inability to continue the study protocol during the research period.
* Development of side effects during caffeinated gum administration that prevented continuation.
* Regular alcohol or drug use that could affect the study outcomes.
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
Attack efficiency
Timeframe: During the 30-minute volleyball-specific skill game in each experimental trial
2
Block efficiency
Timeframe: During the 30-minute volleyball-specific skill game in each experimental trial
3
Defense efficiency
Timeframe: During the 30-minute volleyball-specific skill game in each experimental trial