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Running and swimming may temporarily stress kidneys, study finds

NCT ID NCT04929418

Knowledge-focused Sponsor: Hospital Clínico Universitario de Valladolid 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at how a 10 km run and a 1.5 km swim affect kidney function in 40 healthy, active adults. Researchers used sensitive urine tests to detect subtle kidney changes that standard blood tests might miss. The goal was to better understand temporary kidney stress from intense exercise, 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 could help identify early signs of kidney stress from exercise, leading to better guidance for athletes and safer training practices.
What could go wrong
This is a small, completed observational study with only 40 participants. Results may not apply to non-athletes or people with health conditions, and the findings are exploratory, not definitive.

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

40 people

The number who actually took part.

Started

Jan 2019

Finished

Mar 2020

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 65 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: * Age ≥18 years. * Able to understand the objectives of the study and to provide informed consent. * Body mass index between 18.5 and 29.9 kg / m2 * Active sportsman/woman (defined as previous experience with the planned tests and performing vigorous-intensity aerobic activity at least three times per week). Exclusion Criteria: * History of chronic kidney disease, hypertension, uncontrolled diabetes (defined as fasting glucose levels ≥200 mg/dl or HbA1c ≥9%), peripheral vascular disease, heart disease, neurological disease or thyroid disease. * Use of NSAIDs in the 72h prior to the test. * Consumption of statins or anabolic steroids. * Some kind of major physical injury in the four months prior to the tests.

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Conditions

The condition(s) this trial relates to.

acute kidney injury

As listed by the trial registrant

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

Acute kidney injury

Contacts and locations

Locations

  • Hospital Clínico Universitario

    Valladolid, Valladolid, 47003, Spain

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