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Could fitness delay the Body's fuel switch during exercise?

NCT ID NCT07799662

Knowledge-focused Sponsor: Celil Kaçoğlu 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 02, 2026 · Last updated Sep 03, 2026 · Updated 1 time

Summary

This study asks whether people with higher aerobic fitness switch from burning fat to burning carbohydrates later during exercise. Researchers will have 20 healthy, physically active students aged 18 to 30 run on a treadmill until exhaustion, while measuring their oxygen use and carbon dioxide output. The goal is to see how fitness level affects the timing and intensity of this fuel switch, which could inform training strategies.

What this could mean

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

Active substance
Incremental graded exercise test (Bruce protocol) with breath-by-breath gas analysis
What this could lead to
If fitter people do switch fuel sources later, this could refine training advice and help athletes and active people pace themselves better.
What could go wrong
This is a small, early study in healthy students, so the findings may not apply to other groups. The test only measures one exercise session, not long-term effects.

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

20 people

The number who actually took part.

Started

May 2026

Finished

Jul 2026

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: * Healthy male or female physical education students aged 18 to 30 years * Regularly physically active (participating in structured physical activity at least 3 days per week) * Medically cleared and capable of performing maximal graded treadmill exercise testing to voluntary exhaustion * Willing and able to provide written informed consent Exclusion Criteria: * History of cardiovascular, pulmonary, metabolic, renal, or neuromuscular disorders * Acute musculoskeletal injury or orthopedic condition that impairs treadmill running or maximal exertion * Current use of prescription medications, stimulants, or dietary supplements known to alter metabolic rate, heart rate, or substrate oxidation * Use of tobacco, nicotine products, or alcohol within 24 hours prior to testing * Consumption of caffeine or vigorous physical exercise within 24 hours prior to the exercise trial

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As listed by the trial registrant

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

Cardiorespiratory fitness Maximal oxygen uptake Metabolic flexibility Substrate metabolism during exercise

Contacts and locations

Locations

  • Eskişehir Technical University

    Eskişehir, Tepebaşi, 26100, Turkey (Türkiye)

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