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Caffeinated gum: a game changer for volleyball?

NCT ID NCT07597265

Symptom relief Sponsor: Ege University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at whether chewing caffeinated gum can improve volleyball performance in trained female players. Eleven healthy athletes took part in three sessions: one with placebo gum, one with a single 300 mg dose of caffeine gum, and one with three 100 mg doses spaced out. Researchers measured attack, block, and defense efficiency, as well as jump height and heart rate, during a volleyball-specific game.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

11 people

The number who actually took part.

Started

Aug 2025

Finished

Apr 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 35 years

Sex

Female participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

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.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Performance Volleyball players

Contacts and locations

Locations

  • Ege University, Faculty of Sport Sciences

    Izmir, Bornova, 35040, Turkey (Türkiye)

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