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Painless breath test may end need for muscle biopsies in protein studies

NCT ID NCT07317921

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

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tests whether a non-invasive breath test can accurately measure how the body builds muscle after eating protein, compared to the current gold-standard method that requires muscle biopsies. Eight healthy adults will drink protein shakes with special tracers, then provide breath, urine, and blood samples along with two small muscle biopsies. If the breath test works, it could make future nutrition research much easier and less painful for volunteers.

What this could mean

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

Active substance
Protein drink with stable isotope tracers
What this could lead to
If successful, this could replace painful muscle biopsies with a simple breath test to study how protein builds muscle.
What could go wrong
This is a very small early study (8 people) that only checks if the new method matches the old one. It does not test any treatment or health benefit.

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

About 8 people

The number the study aims to enrol. It can still change while the study runs.

Started

Dec 2025

Expected to finish

May 2026

An estimate. End dates often move.

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

Anyone

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: * Participants will be aged 18-35 years old * Participants will have a BMI within the normal range (i.e., 18.5-24.9) and waist-to-hip circumference ratio of \<0.95 for males and \<0.8 for circumference for females to ensure homogeneity of the sample population * Participants are willing to abide by the compliance rules of this study (e.g., abstain from extraneous physical activity 48h prior to session 4 * Self-reported regular menstrual cycle (25-35d) within the last 3 months (female participants) * Physical activity score of ≥24 units as measured by the Godin leisure time exercise questionnaire Exclusion Criteria: * Inability to adhere to any of the compliance rules judged by principal investigator * Self-reported regular tobacco or illicit drug use (e.g., growth hormone or testosterone) * Current use of hormonal contraceptives * Individuals with a history of allergy to local anesthetics (e.g., lidocaine)

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As listed by the trial registrant

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

Protein metabolism

How to take part

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  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

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Contacts and locations

Locations

  • Kinesiology & Physical Education

    RECRUITING

    Toronto, Ontario, M5S 2C9, Canada

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