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Treadmill study reveals how uphill and downhill running changes Athletes' oxygen use

NCT ID NCT03946215

Knowledge-focused Sponsor: University Hospital, Strasbourg, France 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 well-trained runners' hearts and lungs respond when running on a treadmill at different slopes: uphill, flat, and downhill. Eight athletes completed tests to measure their peak oxygen uptake and muscle fatigue. The goal was to see if downhill running uses less oxygen and causes less fatigue compared to uphill or flat running at the same speed.

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

8 people

The number who actually took part.

Started

Sep 2018

Finished

Dec 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 60 years

Sex

Male 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: * to be a well-trained runner with a VO2max \> à 55 ml/kg/min * nonsmoker or stopped smoking for 5 years * BMI \< 25 * affiliation to the social health insurance scheme * signing an informed consent form. Exclusion criteria: * impossibility to give the subject enlightened information (subject in emergency situation, difficulties in understanding the study, ...); * subject under the protection of justice * subject under guardianship or curatorship * contraindication to the practice of physical and sport activities * lower limbs musculotendinous or articular problems * respiratory, cardiovascular or metabolic pathology * drug treatment in progress and impossibility to stop it within 7 days before the beginning of the study

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As listed by the trial registrant

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

Cardiorespiratory responses Well-trained athletes

Contacts and locations

Locations

  • Les Hôpitaux Universitaires de Strasbourg

    Strasbourg, 67091, France

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