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Just 20 seconds of exercise? study tests Ultra-Short sprints for fitness

NCT ID NCT07328568

Knowledge-focused Sponsor: California State University, San Marcos Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 25, 2026 · Updated 3 times

Summary

This study tests whether doing very short, intense bike sprints—just 10 to 20 seconds, twice a week—can improve cardiorespiratory fitness in inactive adults. Sixty healthy, overweight but otherwise healthy participants will complete 18 sessions over 9 weeks, and their results will be compared to a group that does not exercise. The goal is to see if such a tiny amount of exercise can meaningfully boost fitness and health, which could eventually help update public health guidelines.

What this could mean

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

Active substance
reduced exertion high intensity interval training (REHIT) on a stationary bike
What this could lead to
If it works, this could show that just a few seconds of intense exercise per week can meaningfully improve fitness, potentially leading to simpler exercise recommendations for inactive adults.
What could go wrong
This is a small, early-stage study with only 60 participants. The exercise dose is very low, so the fitness improvements may be small or not clinically meaningful. Results may not apply to older or less healthy adults.

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 60 people

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

Started

Nov 2025

Expected to finish

Sep 2028

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 55 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Healthy * BMI \< 35 kg/m2 * younger than 56 yr old * no joint issues Exclusion Criteria: * Those adults who are currently active and not weight stable * Adults with BMI \> 35 kg/m2 * Use of medications which may alter study outcomes

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Conditions

The condition(s) this trial relates to.

Overweight Sedentary Behavior

As listed by the trial registrant

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

Healthy participants Inactivity, physical Overweight (bmi > 25)

How to take part

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

  1. The places running it

    1 site. 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

  • California State University--San Marcos Human Performance Laboratory

    RECRUITING

    San Marcos, California, 92096, United States

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