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Scientists use wearable sensors to decode mysterious exercise breathing disorder

NCT ID NCT07420530

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 14, 2026 · Updated 1 time

Summary

This study looks at why some active young adults have trouble breathing during exercise due to their vocal cords closing when they shouldn't. Researchers will use a small wearable device on the neck, treadmill tests, and MRI scans to measure breathing patterns and vocal cord movement. The goal is to better understand the condition and improve diagnosis.

What this could mean

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

Active substance
Carbon dioxide (hypercapnic gas) and breathing techniques
What this could lead to
If successful, this could lead to better diagnostic tools and a deeper understanding of why some people experience vocal cord closure during exercise.
What could go wrong
This is a very early, small study focused on observation, not treatment. The findings may not apply to all patients or lead to immediate clinical changes.

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

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 130 people

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

Started

Aug 2026

Expected to finish

Jan 2032

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 26 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 for Exercise-Induced Laryngeal Obstruction (EILO): * Physically active \>2.5 hours per week * Patients with EILO, as diagnosed by routine clinical examination by physician and/or speech language pathologist * Age range of 18-26 years * Greater difficulty breathing inside compared to out and difficulty breathing which is exacerbated at peak exercise and stops 1-5 minutes after exercise * Score of 7 or higher on the Dyspnea Index, which is a validated instrument to capture participant self-report of upper airway dyspnea symptoms. * Classified as low risk, based on the modified Physical Activity Readiness Questionnaire (PAR-Q) questionnaire, body mass index, and non-smoking status * Negative history of voice disorders, self-report of cognitive difficulties, asthma or other lung disease, cardiac disease, serious orthopedic injuries, current uncontrolled hypertension, illicit drug use, seizure/epilepsy, claustrophobia, use of beta blockers. * No metallic, mechanical or magnetic implants such as cardiac devices, cochlear, or other non-removable ear implants, any prosthesis, stents, deep brain stimulator, etc. Inclusion Criteria for Controls * Physically active \>2.5 hours per week * Age range of 18-26 years * Classified as low risk, based on the modified PAR-Q questionnaire, body mass index, and non-smoking status * Negative history of voice disorders, self-report of cognitive difficulties, asthma or other lung disease, cardiac disease, serious orthopedic injuries, current uncontrolled hypertension, illicit drug use, seizure/epilepsy, claustrophobia, use of beta blockers. * No metallic, mechanical or magnetic implants such as cardiac devices, cochlear, or other non-removable ear implants, any prosthesis, stents, deep brain stimulator, etc. Exclusion Criteria for EILO: * Individuals older than 26 years and younger than 18 years of age. * Women who are pregnant or could possibly be pregnant. * BMI \> 25 kg/m2 * A 'yes' answer to any of the 14 questions on the PAR-Q pre-participation questionnaire * Current smoker * Positive history of voice disorders, self-report of cognitive difficulties, asthma or other lung disease, cardiac disease, serious orthopedic injuries, current uncontrolled hypertension, illicit drug use, seizure/epilepsy, claustrophobia, use of beta blockers. * Presence of metallic, mechanical or magnetic implants such as cardiac devices, cochlear, or other non-removable ear implants, any prosthesis, stents, deep brain stimulator, etc. * Do not report the following: Greater difficulty breathing inside compared to out and difficulty breathing which is exacerbated at peak exercise and stops 1-5 minutes after exercise Exclusion Criteria for Controls * Individuals older than 26 years and younger than 18 years of age. * Women who are pregnant or could possibly be pregnant. * BMI \> 25 kg/m2 * A 'yes' answer to any of the 14 questions on the PAR-Q pre-participation questionnaire * Current smoker * Positive history of voice disorders, self-report of cognitive difficulties, asthma or other lung disease, cardiac disease, serious orthopedic injuries, current uncontrolled hypertension, illicit drug use, seizure/epilepsy, claustrophobia, use of beta blockers. * Presence of metallic, mechanical or magnetic implants such as cardiac devices, cochlear, or other non-removable ear implants, any prosthesis, stents, deep brain stimulator, etc. * Significant acute or chronic medical, neurologic, or illness in the patient that, in the judgment of the Principal Investigator, could compromise subject safety, limit the ability to complete the study, and/or compromise the objectives of the study

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

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

How to take part

Only the study team decides who joins. These are the ways to reach them.

  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

  • Indiana University

    RECRUITING

    Bloomington, Indiana, 47401, United States

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