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Gut bugs boost bike speed? study tests synbiotic for cyclists

NCT ID NCT06300060

Symptom relief Sponsor: University of Calgary 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether a synbiotic (a mix of probiotics and prebiotics) could improve endurance in trained cyclists. 22 adults who cycled at least 3 hours per week took either the supplement or a placebo for several weeks, then completed a 20km time trial. Researchers measured completion time, oxygen use, and gut health to see if the supplement made a difference.

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

22 people

The number who actually took part.

Started

Jul 2024

Finished

Dec 2024

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 45 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: * Male or female between the ages of 18-45 * Currently cycling for at least 3 hours per week for the past 3 months * Free of any contraindications to exercise and any medical condition that could interfere with or influence metabolic or cardiovascular responses to exercise * Have a resting heart rate \<100 bpm and resting systolic and diastolic blood pressures \<160 mmHg and \<90 mmHg, respectively. Exclusion Criteria: * Use of antibiotics or probiotic products within 4 weeks prior to study enrollment (note: participants will be eligible after a 2-week washout period) * Current laxative use * Are a smoker or use tobacco products * Consume \>21 units of alcohol per week * Have donated blood in the previous 3 months * Have a BMI ≥30kg/m2 * Are pregnant or lactating or planning to become pregnant for the duration of the study * Are dieting for weight loss or are following a low carbohydrate diet * Have participated in another clinical trial within the 30 days preceding study enrollment * Are taking medications known to affect cardiovascular or metabolic responses to exercise * Have a medical condition that could interfere with study intervention and assessment * Have current musculoskeletal injuries that limit exercise capacity * Are non-English speaking

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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.

Exercise endurance

Contacts and locations

Locations

  • University of Calgary

    Calgary, Alberta, T2N 1N4, Canada

More trials for these conditions

Other studies related to the condition(s) this trial covers.