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Caffeine fails to boost climbing performance, study finds

NCT ID NCT07333443

Knowledge-focused Sponsor: University of Alcala Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 drinking caffeine (3 mg per kg of body weight) helps trained climbers perform better. 13 healthy adults who climb regularly took part. The results showed that caffeine did not improve pull-up strength, grip endurance, or other climbing-related measures.

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

13 people

The number who actually took part.

Started

Jan 2025

Finished

Oct 2025

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: * Healthy individuals * Age between 18 and 40 years * At least three months of continuous climbing practice * Ability to hang for at least 5 seconds from an 18-mm edge * Ability to perform at least one strict body-weight pull-up Exclusion criteria: * Any musculoskeletal or medical condition preventing completion of the experimental protocol * Participation in less than three training sessions per week or a total training volume \<150 min/week * Use of medications or dietary supplements known to affect caffeine metabolism

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As listed by the trial registrant

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

Caffeine Climbing

Contacts and locations

Locations

  • Facultad de Medicina y Ciencias de la Salud. Universidad de Alcalá

    Alcalá de Henares, Madrid, 28805, Spain

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