Caffeine Supplementation and Strength Endurance in Brazilian Jiu-jitsu Athletes (NCT07479875) | Clinical Trial Compass
CompletedNot Applicable
Caffeine Supplementation and Strength Endurance in Brazilian Jiu-jitsu Athletes
Brazil15 participantsStarted 2025-12-12
Plain-language summary
This study investigated the acute effects of ingesting 400 mg of caffeine administered 30 minutes before Brazilian jiu-jitsu-specific strength endurance tests. Experienced athletes completed two conditions, placebo and caffeine, in a randomized, double-blind, crossover clinical trial. Performance was assessed using the dynamic component of the kimono grip strength test (maximum number of repetitions, MNR) and the isometric component (maximum static lift, MSL), both performed with a gi grip. Rating of perceived exertion, adverse effects, and blinding effectiveness were also evaluated.
Who can participate
Age range
18 Years – 35 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:
* Adult men
* Brazilian Jiu-Jitsu athletes
* Minimum of 5 years of continuous practice
* Participation in competitions within the past 12 months
* Absence of upper-limb injuries
* No use of caffeine or stimulant substances within 48 hours prior to testing
* Availability to attend both experimental sessions
* Physical fitness to perform maximal strength tests
Exclusion Criteria:
* Recent musculoskeletal injuries
* Use of stimulant substances, pre-workout supplements, or thermogenic products
* Known hypersensitivity to caffeine
* Clinical conditions that could limit participation (cardiovascular, respiratory, or neurological)
* Failure to attend any experimental session
* Noncompliance with pre-test nutritional guidelines
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
Dynamic component of the Kimono Grip Strength Test (Maximum Number of Repetitions, MNR)
Timeframe: During each experimental session, following intervention administration (two sessions, approximately 7 days apart).
2
Isometric component of the Kimono Grip Strength Test (Maximum Static Lift, MSL)
Timeframe: During each experimental session, following intervention administration (two sessions, approximately 7 days apart).