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Scientists track what happens to Runners' bodies during Ultra-Trail races

NCT ID NCT03712592

Knowledge-focused Sponsor: University Hospital, Grenoble 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 how extreme trail running—races from 40 to 160 km—affects the body. Researchers measured muscle fatigue, heart function, blood sugar, body composition, and sleep in 83 experienced runners before and after races. The goal was to better understand the physical toll of these events and how the body recovers.

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

83 people

The number who actually took part.

Started

Jul 2018

Finished

Sep 2018

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 55 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: * Man or woman * 18-55 years * Absence of chronic cardiovascular, respiratory, metabolic or neuromuscular disease * \> 3 years of trail running (at least 1 race\> 40 km / year completed and a race\> 100 km completed (trail group 160 km) * Medical certificate of no contraindication to the practice of the trail * Subjects available in Grenoble before and within 15 days after the race * Subjects affiliated to a social security scheme * Subjects able to sign informed consent. Exclusion Criteria: * Cardiorespiratory, metabolic and neurological diseases * Non-Echogenic Subjects * Subjects with chronic sleep disorders * Psychiatric pathologies or ATCD of behavioral disorders * Persons refusing to sign the information sheet and the participation agreement, * persons under guardianship or not subject to a social security scheme, * Pregnant woman, parturient, breastfeeding mother * Person deprived of liberty by judicial or administrative decision, * Person subject to a legal protection measure, who can not be included in clinical trials.

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As listed by the trial registrant

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

Muscle fatigue

Contacts and locations

Locations

  • CHU Grenoble-Alpes

    Grenoble, 38043, France

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