A prescription for play: can School-Based 'Green Prescriptions' revive teen activity?

NCT ID NCT07770997

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 18, 2026 · Last updated Aug 19, 2026 · Updated 1 time

Summary

This trial tests a school-based 'green prescription'—a program where physical education teachers provide teens with personalized activity goals, educational materials, and weekly encouragement to boost leisure-time physical activity. Aimed at 15-17-year-olds who are not active enough, the study also explores whether adding support from a dietitian, psychologist, and other specialists makes the program more effective. Participants' activity levels and health markers are tracked before, right after, and six months following the 12-week program.

What this could mean

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

Active substance
Green Prescription (Teacher-Led) - a school-based behavioral intervention with individualized physical activity recommendations, educational materials, and weekly motivational support
What this could lead to
If effective, this could offer a simple, school-based strategy to increase physical activity and reduce sedentary behavior in adolescents, potentially curbing obesity and related health issues.
What could go wrong
The trial is relatively small and relies on self-reported activity measures, which may not fully capture actual behavior change. Long-term adherence beyond the 12-week intervention remains uncertain.

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

308 people

The number who actually took part.

Started

Jun 2024

Finished

Jun 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

15 to 17 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.

General inclusion criteria * Adolescents aged 15-17 years. * Enrollment in a participating secondary school. * Health status allowing participation in physical activity. * Stable body weight during the month preceding enrollment (±1 kg). * Written informed consent from the participant and a parent or legal guardian, as required by local regulations. Intervention Groups (A-C) Participants were eligible if they met all of the following criteria: \- Insufficient physical activity, defined as reporting fewer than 5 days during the previous week with at least 60 minutes of moderate-to-vigorous physical activity, assessed using the MVPA questionnaire. and met one of the following group-specific criteria: Group A - Overweight or Obesity * Body fat percentage above the age- and sex-specific reference values. * BMI ≥25 kg/m² (used as an auxiliary screening criterion). Group B - High Screen Time * Recreational screen time ≥4 hours per day. Group C - Low Social Support * Low perceived social support assessed using the Student Social Support Scale for Young People (SSYSS). * Low psychological well-being assessed using the KIDSCREEN-52 questionnaire (boys \<37.29; girls \<42.64). Comparison Group (Group D) * Sufficient physical activity, defined as reporting at least 5 days during the previous week with at least 60 minutes of moderate-to-vigorous physical activity, assessed using the MVPA questionnaire. * No participation in the Green Prescription intervention. Exclusion Criteria * Secondary obesity. * Acute or chronic medical conditions preventing participation in physical activity. * Pregnancy or breastfeeding. * Current psychological or psychiatric diagnosis requiring active treatment. * Failure to provide written informed consent.

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Conditions

The condition(s) this trial relates to.

Motor Activity Obesity obesity disorder Overweight Sedentary Behavior

As listed by the trial registrant

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

Contacts and locations

Locations

  • Poznan University of Physical Education

    Poznan, Greater Poland Voivodeship, 61-871, Poland

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