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Caffeine boost for BJJ grip? small study shows mixed results

NCT ID NCT07479875

Symptom relief Sponsor: Federal University of Minas Gerais 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Sep 04, 2026 · Updated 2 times

Summary

This study tested whether taking 400 mg of caffeine (about 4 cups of coffee) 30 minutes before exercise could improve grip strength endurance in Brazilian jiu-jitsu athletes. Fifteen experienced male athletes performed grip strength tests after taking caffeine or a placebo. The results showed small improvements in some athletes, but the study was very small and more research is needed.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
caffeine
What this could lead to
If it works, this could help athletes improve short-term performance in strength-based tasks.
What could go wrong
This is a very small, early study with only 15 athletes. Results may not apply to other sports or people, and caffeine can cause side effects like jitters or upset stomach.

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

15 people

The number who actually took part.

Started

Dec 2025

Finished

Feb 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

Male 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: * 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

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Conditions

The condition(s) this trial relates to.

Motor Activity

As listed by the trial registrant

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

Exercise Muscle strength Physical endurance

Contacts and locations

Locations

  • Universidade Federal de Minas Gerais (UFMG), Laboratory of Nutrition and Exercise Training (LAN-UFMG), Belo Horizonte, MG, Brazil

    Belo Horizonte, Minas Gerais, 31275000, Brazil

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