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From couch to triathlon: what happens inside your body after a year of training?

NCT ID NCT06467656

Knowledge-focused Sponsor: University of British Columbia Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looked at how 12 months of personalized endurance training—swimming, cycling, and running—affects the body and mind of healthy adults who were not regular exercisers. Fifty-eight people aged 19-39 took part, with some training up to 20 hours a week and others serving as a control group. The main goal was to measure changes in maximum oxygen use (VO2max) and other physical and mental adaptations over time.

What this could mean

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

Active substance
endurance training (swimming, cycling, running) plus strengthening exercises
What this could lead to
If successful, this could help design better training programs for beginners and improve understanding of how exercise changes the body over a year.
What could go wrong
This is a small, completed study in healthy volunteers, not a treatment trial. Results may not apply to older or less fit people, and no disease outcomes are measured.

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

58 people

The number who actually took part.

Started

Jun 2024

Finished

Feb 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

19 to 39 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: Exercise Intervention Group * Aged 19-39 years * Non-smoker (quit \>6 months) * Able to swim \>100 meters without stopping * Have access to, or willingness, to obtain a road bicycle * Are willing to commit to the research assessments and prescribed training program * Currently performing \<120 minutes of structured endurance training per week * Premenopausal Inclusion Criteria: Control Group * Aged 19-39 years * Non-smoker (quit \>6 months) * Are willing to commit to the research assessments * Currently performing \<120 minutes of structured endurance training per week * Premenopausal Exclusion Criteria: Exercise Intervention Group and Control Group: * History of heart disease * History of lung disease (not including controlled asthma) * History of metabolic disease * History of cancer * Chronic inflammatory conditions * Blood pressure \> 140/90 mmHg * Chronic antibiotic, antiviral, antimicrobial, non-steroidal anti-inflammatory drugs (NSAIDs) and antihistamine use * Are a regular (more than 1/week) cannabis user * Consume alcohol regularly: more than 6 standard drinks per week (e.g.14-20 ounces of beer and 5-8 ounces of wine) * Have previously completed structured endurance exercise training for an extended period of time (such as training for a triathlon or running race) * Have previously participated in competitive team sports with an aerobic component (e.g. soccer, basketball, rugby, field hockey) and sport-specific training (e.g. hockey, football) \>3 times per week within the previous 5 years * Have prior experience of heavy structured resistance training \>3x/week within the last 2 years * BMI\>32 kg/m2 or \<20 kg/m2 * Pregnancy within 12 months, or planning to become pregnant within the next 12 months * Currently breast feeding (or having stopped within 6 months) * Planning to be away from the Okanagan area for an extended period over the duration of the study

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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.

Healthy participants

Contacts and locations

Locations

  • University of British Columbia

    Kelowna, British Columbia, V1V1V7, Canada

More trials for these conditions

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