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Scientists track Lactate's journey inside red blood cells during workouts

NCT ID NCT06104150

Knowledge-focused Sponsor: Technical University of Madrid 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 26, 2026 · Updated 1 time

Summary

This study looks at how lactate, a substance produced during exercise, moves between blood plasma and red blood cells. Researchers will test 84 healthy people (both trained athletes and sedentary individuals) during interval cycling. They will also check if a genetic variation affects this process. The goal is to better understand energy metabolism, not to test a treatment.

What this could mean

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

What this could lead to
If successful, this research could improve our understanding of how the body handles lactate during exercise, potentially informing training strategies.
What could go wrong
This is an early-stage observational study with no direct treatment or health outcome. Results may not lead to practical applications.

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 84 people

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

Started

Feb 2020

Expected to finish

Jul 2027

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 30 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: * BMI between 18 and 25 kg/m2 * Not smoker * In the case of trained participants: training at least 5 hours/week, of which at least 3 must be aerobic/anaerobic endurance training. Presentation of a medical certificate attesting to their medical fitness (capability) to perform intense physical exercise. * In the case of sedentary participants, less than 1 day of training per week or less than 2 hours of structured exercise per week. Exclusion Criteria: * Presenting any pathology that could impede the correct performance of the tests, or could influence the main study variables. * In the case of the female sample, having irregular menstrual cycles, oligomenorrhea or amenorrhea.

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Conditions

The condition(s) this trial relates to.

Motor Activity

As listed by the trial registrant

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

Energy metabolism

How to take part

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

  1. The places running it

    2 sites. 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

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Laboratorio de Fisiología del Esfuerzo. Facultad de Ciencias de la Actividad Física y del Deporte (INEF). Universidad Politécnica de Madrid

    RECRUITING

    Madrid, Madrid, 28040, Spain

  • Laboratorio de Pediatría. School of Medicine. Univesidad de Cantabria

    RECRUITING

    Santander, Cantabria, 39011, Spain

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