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Thirst-Guided hydration studied in Ultra-Trail runners

NCT ID NCT02519764

Knowledge-focused Sponsor: Centre Hospitalier Universitaire de Nīmes 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study followed 198 runners in the 2015 Ultra-Trail Mont-Blanc to see if drinking only when thirsty ("at thirst") keeps blood sodium levels more stable compared to other drinking plans. The goal is to understand how hydration affects health during extreme endurance events. Results may help guide safer hydration advice for athletes.

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

198 people

The number who actually took part.

Start date

Aug 2015

Finished

Aug 2015

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 years and older

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: * The subject must have given his/her informed and signed consent * The subject must be insured or beneficiary of a health insurance plan * The subject is participating in the 2015 Mont-Blanc Ultra Trail and has no contra-indication for ultra-trail activities Exclusion Criteria: * The subject is participating in another study * The subject is in an exclusion period determined by a previous study * The subject is under judicial protection, under tutorship or curatorship * The subject refuses to sign the consent * It is impossible to correctly inform the subject * The subject is pregnant or breastfeeding The subject will be excluded from the study in case of early drop out (before 15 km of trail).

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Conditions

The condition(s) this trial relates to.

tinea pedis

As listed by the trial registrant

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

Athletes Healthy

Contacts and locations

Locations

  • CHRU de Nîmes - Hôpital Universitaire Carémeau

    Nîmes, 30029, France

  • CHU de Nice - Hôpital St-Roch

    Nice, 06001, France

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