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Can kids build muscle like adults? new study tests flywheel vs. weight stack training

NCT ID NCT06698055

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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

Summary

This completed study looked at how children (ages 9-13) and adults (ages 18-50) respond to 12 weeks of resistance exercise using either flywheel or traditional weight stack machines. 91 healthy participants were randomly assigned to one of three groups: flywheel training, weight stack training, or a control group. Researchers measured muscle growth and strength changes, and checked for any negative effects on children's growth plates. The goal was to understand if children can safely gain muscle from resistance training and how their response compares to adults.

What this could mean

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

Active substance
resistance exercise (flywheel or weight stack devices)
What this could lead to
If successful, this could show that resistance exercise is safe and effective for building muscle in children, similar to adults.
What could go wrong
This is a small, completed study focused on healthy volunteers, not a treatment for any disease. Results may not apply to other populations or exercise types.

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

91 people

The number who actually took part.

Started

Aug 2022

Finished

Feb 2025

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

9 to 50 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: * Adults at the age of 18 to 50 at time of inclusion. * Children at the age of nine to 13 (attending Swedish middle school) at time of inclusion Exclusion Criteria: * Neuromuscular disease. * Previous or current musculoskeletal injury, primarily of the lower limb, preventing resistance exercise. * Heavy resistance training of the lower limb at inclusion (i.e., more than one session per week of weight training of the lower limb or other equivalent activity)

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Conditions

The condition(s) this trial relates to.

myostatin-related muscle hypertrophy skeletal muscle disorder

As listed by the trial registrant

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

Children, adult EMG Growth plate early closing Magnetic resonance imaging Muscle hypertrophy Resistance exercise Skeletal muscle

Contacts and locations

Locations

  • Department of Orthopaedic Surgery, Höglandssjukhuset District Hospital Eksjö

    Eksjö, Region Jönköping County, 57581, Sweden

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