NCT07770997Completed
The Green Prescription Program for Increasing Physical Activity in Adolescents
Effectiveness of the Green Prescription: The Preventive Role of Health Education
Source: ClinicalTrials.gov · Last updated 18 Aug 2026
Brief summary (registry, in English)
This study evaluated the effectiveness of the Green Prescription, a school-based behavioral intervention that incorporated health education, designed to increase physical activity among adolescents aged 15-17 years who were insufficiently active. Participants received individualized written physical activity recommendations together with motivational support to encourage gradual increases in leisure-time physical activity. The intervention was tailored to three target groups: adolescents with overweight or obesity, excessive screen time, or low perceived social support. The study consisted of two sequential cohorts. In the first cohort, the Green Prescription was delivered by a physical education teacher. In the second cohort, the intervention was delivered by a physical education teacher supported by an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. Physical activity and other health-related outcomes were assessed at baseline, immediately after the 12-week intervention, and six months later. The study evaluated the effectiveness of the Green Prescription in each intervention group and determined whether the interdisciplinary delivery model resulted in greater improvements in physical activity and healthy lifestyle behaviors than the teacher-led model.
- Status (registry)
- Completed
- Study type
- Interventional
- Enrollment
- 308 (actual)
- First submitted
- 31 Jul 2026
- Start date
- 3 Jun 2024
- Primary completion date
- 20 Jun 2026
- Lead sponsor
- Poznan University of Physical Education
- Diseases
- Obesity
- NCT number
- NCT07770997
What you commit to
- Study type: Interventional
- Participants enrolled: 308
- From 3 Jun 2024 to the primary completion date, 20 Jun 2026
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Other illness
- Acute or chronic medical conditions preventing participation in physical activity.
- Current psychological or psychiatric diagnosis requiring active treatment.
- Failure to provide written informed consent.
Other
- Secondary obesity.
- Pregnancy or breastfeeding.
Criteria the registry did not label
- 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.
Age in the registry: 15 years to 17 years · Sex: All · Accepts healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Poznan University of Physical Education Coordinator of this site? Confirm its status | Poznan | Poland | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.