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Caffeine's hidden power: a week of daily doses may supercharge Upper-Body strength

NCT ID NCT07771556

Symptom relief Sponsor: Birjand University of Medical Sciences 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 18, 2026 · Last updated Aug 19, 2026 · Updated 1 time

Summary

This trial tests whether taking caffeine daily for a week can improve upper-body anaerobic power—the kind of explosive strength used in short, intense efforts—in healthy active women aged 25 to 30. Participants receive either caffeine (5 mg per kg of body weight) or a placebo capsule for 7 days. Researchers measure peak power during a 20-second arm cycling test, along with heart rate variability and cognitive performance, to see if caffeine boosts performance without affecting heart or brain function.

What this could mean

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

Active substance
Caffeine (5 mg per kg of body weight daily for 7 days)
What this could lead to
If it works, this could point to a simple way for active women to boost short bursts of upper-body power, like in sports or daily tasks.
What could go wrong
The trial is small (30 people) and short-term, so results may not apply broadly. Caffeine can cause side effects like jitters or sleep issues, and the performance boost may be modest.

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

30 people

The number who actually took part.

Started

Jan 2020

Finished

Sep 2020

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 30 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: Active women aged 25 to 30 years Body mass index (BMI) between 18 and 25 kg/m² Physical activity readiness (based on the PAR-Q questionnaire) No injuries within the last month Non-smoking No cold or COVID-19 infection in the past four weeks No cardiovascular, metabolic, or respiratory infections in the last three months Normal blood pressure No use of anabolic steroids, central nervous system stimulants, or other sports supplements in the past six months Exclusion Criteria: Inability to follow the protocol Daily caffeine intake exceeding 300 mg (assessed using an adapted FFQ) Consumption of alcohol or intense aerobic activity within 48 hours prior to testing Resistance training with weights within 72 hours prior to testing Caffeine consumption within 24 hours prior to testing

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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.

Caffeine Exercise Physical fitness

Contacts and locations

Locations

  • Faculty of Sport Sciences, University of Birjand

    Birjand, South Khorasan Province, 9717434765, Iran

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