A prescription for play: can School-Based 'Green Prescriptions' revive teen activity?
NCT ID NCT07770997
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.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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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
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308 people
The number who actually took part.
- Started
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Jun 2024
- Finished
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Jun 2026
- Lead sponsor
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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
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15 to 17 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Poznan University of Physical Education
Poznan, Greater Poland Voivodeship, 61-871, Poland
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