Social SupportNCT07770997
The Green Prescription Program for Increasing Physical Activity in Adolescents
A study testing Green Prescription (Teacher-Led) and Green Prescription (Interdisciplinary) in people with Social Support and Screen Time, run by Poznan University of Physical Education at 1 site in Poland.
Trial summary
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. Read more about this study
- Who is it for?
- Ages 15 to 17 yearsHealthy volunteers can take part
- Conditions the study is for
- Social Support, Screen Time, Physical Inactivity
- What is being tested?
- Green Prescription (Teacher-Led) and Green Prescription (Interdisciplinary)
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 308 participants
- Where
- 1 sitePoland
- Study dates
- 3 Jun 2024to 30 Jun 2026
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 15 to 17 years
- All sexes
- Healthy volunteers accepted
- Child
Who may be able to join
None listed.
Who cannot join
- 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.
Trial locations and contacts
1 site in 1 country.
Poland1 site
Poznan University of Physical Education
Poznan, Greater Poland Voivodeship, 61-871
About this study
Official title: Effectiveness of the Green Prescription: The Preventive Role of Health Education
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.
Read more
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.
Read the detailed description
Regular physical activity during adolescence contributes to physical, mental, and social well-being. Despite well-established health benefits, many adolescents do not achieve recommended levels of physical activity. Schools provide an important setting for implementing behavioral interventions that encourage lifelong healthy habits.
The Green Prescription was a school-based behavioral intervention that incorporated health education to promote leisure-time physical activity among adolescents with insufficient physical activity. The intervention combined individualized written physical activity recommendations with health education and regular motivational support. Activity goals were tailored to each participant and were progressively increased throughout the intervention.
The study consisted of two sequential cohorts. Participants with insufficient physical activity were assigned to one of three intervention groups according to their primary risk factor: overweight or obesity, excessive screen time, or low perceived social support. Each intervention group followed the same Green Prescription framework while receiving recommendations and educational materials tailored to its primary risk factor. Adolescents with sufficient physical activity served as a comparison group and did not receive the intervention.
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. Each cohort included three parallel intervention groups and one comparison group, allowing evaluation of both the effectiveness of the Green Prescription within each target group and the added value of the interdisciplinary delivery model.
Outcomes were assessed at baseline, immediately after the 12-week intervention, and six months after completion of the intervention. The study evaluated both the immediate and sustained effects of the Green Prescription on physical activity and related health outcomes.
- Conditions
- Social Support, Screen Time, Physical Inactivity, Sedentary Lifestyle, Overweight and/or Obesity
- Being tested
- Green Prescription (Teacher-Led), Green Prescription (Interdisciplinary)
- Keywords
- physical activity, risk groups, screen time, adolescents, overweight, social support, obesity
- Medical subject headings
- Sedentary Behavior, Motor Activity, Overweight, Obesity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Green Prescription (Teacher-Led)Behavioural
The Green Prescription is a school-based behavioral intervention incorporating health education to promote leisure-time physical activity among adolescents with insufficient physical activity. The intervention includes individualized weekly written physical activity recommendations, educational materials, and weekly motivational support, supplemented by additional support when required, delivered by a physical education teacher over a 12-week period. All participants follow the same Green Prescription framework, with group-specific objectives, physical activity recommendations, and educational materials tailored to their primary risk profile (overweight or obesity, excessive recreational screen time, or low perceived social support).
Activities were adapted to group needs and recommended PA levels. Written recommendations and educational materials were delivered electronically.
Green Prescription (Interdisciplinary)Behavioural
The Green Prescription is a school-based behavioral intervention incorporating health education to promote leisure-time physical activity among adolescents with insufficient physical activity. The intervention includes individualized weekly written physical activity recommendations, educational materials, and weekly motivational support, supplemented by additional support when required, over a 12-week period. The intervention is delivered by a physical education teacher together with an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. All participants follow the same Green Prescription framework, with group-specific objectives, physical activity recommendations, and educational materials tailored to their primary risk profile (overweight or obesity, excessive screen time, or low perceived social support). Written recommendations and educational materials were delivered electronically.
| Study group | Role | What they receive |
|---|---|---|
| OW - Teacher-Led Green Prescription | Experimental | Adolescents with insufficient physical activity and overweight or obesity participated in the first study cohort. Participants received the Green Prescription delivered by a physical education teacher. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and improving weight-related health behaviors. Receives: Behavioral: Green Prescription (Teacher-Led) |
| HST - Teacher-Led Green Prescription | Experimental | Adolescents with insufficient physical activity and excessive screen time participated in the first study cohort. Participants received the Green Prescription delivered by a physical education teacher. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and reducing recreational screen time. Receives: Behavioral: Green Prescription (Teacher-Led) |
| LSS - Teacher-Led Green Prescription | Experimental | Adolescents with insufficient physical activity and low perceived social support participated in the first study cohort. Participants received the Green Prescription delivered by a physical education teacher. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and strengthening social support for active lifestyles. Receives: Behavioral: Green Prescription (Teacher-Led) |
| Comparison Group - Cohort 1 | No intervention | Adolescents with sufficient physical activity participated in the first study cohort. Participants completed the same assessments as the intervention groups but did not receive the Green Prescription intervention. |
| OW - Interdisciplinary Green Prescription | Experimental | Adolescents with insufficient physical activity and overweight or obesity participated in the second study cohort. Participants received the Green Prescription delivered by a physical education teacher with support from an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and improving weight-related health behaviors. Receives: Behavioral: Green Prescription (Interdisciplinary) |
| HST - Interdisciplinary Green Prescription | Experimental | Adolescents with insufficient physical activity and excessive screen time participated in the second study cohort. Participants received the Green Prescription delivered by a physical education teacher with support from an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and reducing recreational screen time. Receives: Behavioral: Green Prescription (Interdisciplinary) |
| LSS - Interdisciplinary Green Prescription | Experimental | Adolescents with insufficient physical activity and low perceived social support participated in the second study cohort. Participants received the Green Prescription delivered by a physical education teacher with support from an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and strengthening social support for active lifestyles. Receives: Behavioral: Green Prescription (Interdisciplinary) |
| Comparison Group - Cohort 2 | No intervention | Adolescents with sufficient physical activity participated in the second study cohort. Participants completed the same assessments as the intervention groups but did not receive the Green Prescription intervention. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in Moderate-to-Vigorous Physical Activity (MVPA) Screening Score
Self-reported physical activity was assessed using the MVPA screening measure. Participants reported the number of days on which they engaged in at least 60 minutes of moderate-to-vigorous physical activity (1) during the previous week (P1) and (2) during a typical week (P2). The MVPA screening score was calculated as the mean of the two responses: (P1 + P2) / 2, with a possible range of 0-7 days. Higher scores indicate a greater number of days with at least 60 minutes of MVPA.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Mean Daily Step Count (Huawei Watch Fit SE)
Objective physical activity assessed using Huawei Watch Fit SE. Participants wore the device for a 7-day baseline monitoring period, continuously throughout the 12-week intervention, for a 7-day post-intervention monitoring period, and for a 7-day monitoring period at the 6-month follow-up. The primary outcome is the mean daily step count derived from the monitoring periods used for outcome assessment.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Secondary outcomes (12)
Change in Body Mass Index (BMI)
Body Mass Index (BMI) was calculated from measured body weight and height as weight in kilograms divided by height in meters squared (kg/m²). Weight and height were combined to derive a single reported BMI value; the reported unit of measure was kg/m².
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Waist Circumference
Waist circumference was measured in centimetres (cm) and reported as a single waist circumference value in cm at each assessment point.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Hip Circumference
Hip circumference measured in centimetres (cm).
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Body Fat Percentage
Body fat percentage (FatP) assessed using Tanita bioelectrical impedance analysis.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Fat Mass
Fat mass (FatM) measured using Tanita bioelectrical impedance analysis.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Fat-Free Mass
Fat-free mass (FFM) measured using Tanita bioelectrical impedance analysis.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Total Body Water
Total body water (TBW) assessed using Tanita bioelectrical impedance analysis.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Predicted Muscle Mass
Predicted muscle mass (PMM) measured using Tanita bioelectrical impedance analysis.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Screen Time
Screen time was assessed using selected items from the Health Behaviour in School-aged Children (HBSC) questionnaire and average daily active screen time recorded from participants' smartphones.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Sleep Duration
Sleep duration assessed using Huawei Watch Fit SE. The outcome is the mean total sleep duration derived from 7-day monitoring periods.
Measured: Baseline (7-day monitoring period), immediately after the 12-week intervention (7-day monitoring period), and 6 months after completion of the intervention (7-day monitoring period).
Change in Perceived Social Support
Perceived Social Support assessed using the Short Scale of Youth's Social Support Assessment (SSYSS). Total scores range from 1.0 to 4.0, with higher scores indicating higher perceived support.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Health-Related Quality of Life
Health-related quality of life assessed using the KIDSCREEN-52 questionnaire. Total scores range from 23.3 to 100.0, with higher scores indicating better health-related quality of life.
Measured: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted18 Aug 2026
- Study start3 Jun 2024
- Primary completion20 Jun 2026
- Study completion30 Jun 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Social SupportStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Model description
- The study was a controlled pre-post intervention study conducted in two sequential cohorts. In each cohort, participants were allocated to one of four parallel study groups according to predefined eligibility criteria: overweight or obesity (OW), excessive screen time (HST), low perceived social support (LSS), or a comparison group with sufficient physical activity. 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. The comparison group did not receive the intervention.
- Masking
- None (open label)
- Enrolment
- 308 participants (actual)
Sponsor and investigators
- Lead sponsor
- Poznan University of Physical Education
- Sponsor type
- University, hospital or other
- Collaborators
- Ministry of Science and Higher Education, Poland
- Responsible party
- Sponsor
- Investigators
- Jana Krzysztoszek, PhD, DSc, Principal investigator, Poznan University of Physical Education
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07770997
- Sponsor's protocol ID
- NdS-II/SP/0560/2023/01
- Other IDs
- NdS-II/SP/0560/2023/01
- Status last verified
- Jul 2026
- First submitted
- 31 Jul 2026
- Last updated
- 18 Aug 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data (IPD) will not be shared because the study involved minors, and no data-sharing plan was included in the study protocol or participant consent procedures.
Publications
Marlena Łopatka, Michał Bronikowski, Małgorzata Bronikowska, Agata Korcz, Maryna Khorkova, Dagny Adamczak, Jana Krzysztoszek; Physical activity recommendations for adolescents with overweight, high screen time, and low social support - A scoping review; Biomedical Human Kinetics; Volume 18 Issue 1; pp. 100-111. DOI: 10.2478/bhk-2026-0011
Study at a glance
From the registry record, last updated by the sponsor on 18 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effectiveness of the Green Prescription: The Preventive Role of Health Education
- ClinicalTrials.gov ID
- NCT07770997
- Acronym / sponsor ID
- NdS-II/SP/0560/2023/01
- Conditions
- Social Support, Screen Time, Physical Inactivity, Sedentary Lifestyle, Overweight and/or Obesity
- Keywords
- physical activity, risk groups, screen time, adolescents, overweight, social support, obesity
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 308 participants (actual)
- Lead sponsor
- Poznan University of Physical EducationUniversity, hospital or other
- Collaborators
- Ministry of Science and Higher Education, Poland
- Study start
- 3 Jun 2024 (actual)
- Primary completion
- 20 Jun 2026 (actual)
- Study completion
- 30 Jun 2026 (actual)
- First posted
- 18 Aug 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Detailed description
Regular physical activity during adolescence contributes to physical, mental, and social well-being. Despite well-established health benefits, many adolescents do not achieve recommended levels of physical activity. Schools provide an important setting for implementing behavioral interventions that encourage lifelong healthy habits.
The Green Prescription was a school-based behavioral intervention that incorporated health education to promote leisure-time physical activity among adolescents with insufficient physical activity. The intervention combined individualized written physical activity recommendations with health education and regular motivational support. Activity goals were tailored to each participant and were progressively increased throughout the intervention.
The study consisted of two sequential cohorts. Participants with insufficient physical activity were assigned to one of three intervention groups according to their primary risk factor: overweight or obesity, excessive screen time, or low perceived social support. Each intervention group followed the same Green Prescription framework while receiving recommendations and educational materials tailored to its primary risk factor. Adolescents with sufficient physical activity served as a comparison group and did not receive the intervention.
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. Each cohort included three parallel intervention groups and one comparison group, allowing evaluation of both the effectiveness of the Green Prescription within each target group and the added value of the interdisciplinary delivery model.
Outcomes were assessed at baseline, immediately after the 12-week intervention, and six months after completion of the intervention. The study evaluated both the immediate and sustained effects of the Green Prescription on physical activity and related health outcomes.
Study design
- Primary purpose
- Prevention
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 8
- Model description
- The study was a controlled pre-post intervention study conducted in two sequential cohorts. In each cohort, participants were allocated to one of four parallel study groups according to predefined eligibility criteria: overweight or obesity (OW), excessive screen time (HST), low perceived social support (LSS), or a comparison group with sufficient physical activity. 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. The comparison group did not receive the intervention.
| Arm | Type | Receives |
|---|---|---|
| OW - Teacher-Led Green Prescription | Experimental | Behavioral: Green Prescription (Teacher-Led)Adolescents with insufficient physical activity and overweight or obesity participated in the first study cohort. Participants received the Green Prescription delivered by a physical education teacher. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and improving weight-related health behaviors. |
| HST - Teacher-Led Green Prescription | Experimental | Behavioral: Green Prescription (Teacher-Led)Adolescents with insufficient physical activity and excessive screen time participated in the first study cohort. Participants received the Green Prescription delivered by a physical education teacher. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and reducing recreational screen time. |
| LSS - Teacher-Led Green Prescription | Experimental | Behavioral: Green Prescription (Teacher-Led)Adolescents with insufficient physical activity and low perceived social support participated in the first study cohort. Participants received the Green Prescription delivered by a physical education teacher. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and strengthening social support for active lifestyles. |
| Comparison Group - Cohort 1 | No intervention | –Adolescents with sufficient physical activity participated in the first study cohort. Participants completed the same assessments as the intervention groups but did not receive the Green Prescription intervention. |
| OW - Interdisciplinary Green Prescription | Experimental | Behavioral: Green Prescription (Interdisciplinary)Adolescents with insufficient physical activity and overweight or obesity participated in the second study cohort. Participants received the Green Prescription delivered by a physical education teacher with support from an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and improving weight-related health behaviors. |
| HST - Interdisciplinary Green Prescription | Experimental | Behavioral: Green Prescription (Interdisciplinary)Adolescents with insufficient physical activity and excessive screen time participated in the second study cohort. Participants received the Green Prescription delivered by a physical education teacher with support from an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and reducing recreational screen time. |
| LSS - Interdisciplinary Green Prescription | Experimental | Behavioral: Green Prescription (Interdisciplinary)Adolescents with insufficient physical activity and low perceived social support participated in the second study cohort. Participants received the Green Prescription delivered by a physical education teacher with support from an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. The intervention included individualized physical activity recommendations, motivational support, and educational materials focused on increasing physical activity and strengthening social support for active lifestyles. |
| Comparison Group - Cohort 2 | No intervention | –Adolescents with sufficient physical activity participated in the second study cohort. Participants completed the same assessments as the intervention groups but did not receive the Green Prescription intervention. |
Who may qualify
- Ages
- 15 to 17 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child
Key inclusion criteria (0 listed)
Key exclusion criteria (5 listed)
- 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.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Green Prescription (Teacher-Led)The Green Prescription is a school-based behavioral intervention incorporating health education to promote leisure-time physical activity among adolescents with insufficient physical activity. The intervention includes individualized weekly written physical activity recommendations, educational materials, and weekly motivational support, supplemented by additional support when required, delivered by a physical education teacher over a 12-week period. All participants follow the same Green Prescription framework, with group-specific objectives, physical activity recommendations, and educational materials tailored to their primary risk profile (overweight or obesity, excessive recreational screen time, or low perceived social support). Activities were adapted to group needs and recommended PA levels. Written recommendations and educational materials were delivered electronically. | Behavioural | HST - Teacher-Led Green Prescription, LSS - Teacher-Led Green Prescription, OW - Teacher-Led Green Prescription |
| Green Prescription (Interdisciplinary)The Green Prescription is a school-based behavioral intervention incorporating health education to promote leisure-time physical activity among adolescents with insufficient physical activity. The intervention includes individualized weekly written physical activity recommendations, educational materials, and weekly motivational support, supplemented by additional support when required, over a 12-week period. The intervention is delivered by a physical education teacher together with an interdisciplinary team consisting of a dietitian, psychologist, special education teacher, and physiotherapist. All participants follow the same Green Prescription framework, with group-specific objectives, physical activity recommendations, and educational materials tailored to their primary risk profile (overweight or obesity, excessive screen time, or low perceived social support). Written recommendations and educational materials were delivered electronically. | Behavioural | HST - Interdisciplinary Green Prescription, LSS - Interdisciplinary Green Prescription, OW - Interdisciplinary Green Prescription |
Primary outcome
Change in Moderate-to-Vigorous Physical Activity (MVPA) Screening Score
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Self-reported physical activity was assessed using the MVPA screening measure. Participants reported the number of days on which they engaged in at least 60 minutes of moderate-to-vigorous physical activity (1) during the previous week (P1) and (2) during a typical week (P2). The MVPA screening score was calculated as the mean of the two responses: (P1 + P2) / 2, with a possible range of 0-7 days. Higher scores indicate a greater number of days with at least 60 minutes of MVPA.
Change in Mean Daily Step Count (Huawei Watch Fit SE)
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Objective physical activity assessed using Huawei Watch Fit SE. Participants wore the device for a 7-day baseline monitoring period, continuously throughout the 12-week intervention, for a 7-day post-intervention monitoring period, and for a 7-day monitoring period at the 6-month follow-up. The primary outcome is the mean daily step count derived from the monitoring periods used for outcome assessment.
12 secondary outcomes
Change in Body Mass Index (BMI)
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Waist Circumference
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Hip Circumference
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Body Fat Percentage
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Fat Mass
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Fat-Free Mass
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Total Body Water
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Predicted Muscle Mass
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Screen Time
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Sleep Duration
Time frame: Baseline (7-day monitoring period), immediately after the 12-week intervention (7-day monitoring period), and 6 months after completion of the intervention (7-day monitoring period).
Change in Perceived Social Support
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Change in Health-Related Quality of Life
Time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 18 Aug 2026.
- BackgroundMarlena Łopatka, Michał Bronikowski, Małgorzata Bronikowska, Agata Korcz, Maryna Khorkova, Dagny Adamczak, Jana Krzysztoszek; Physical activity recommendations for adolescents with overweight, high screen time, and low social support - A scoping review; Biomedical Human Kinetics; Volume 18 Issue 1; pp. 100-111. DOI: 10.2478/bhk-2026-0011
- Individual participant dataSharing planned: No. Individual participant data (IPD) will not be shared because the study involved minors, and no data-sharing plan was included in the study protocol or participant consent procedures.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Jana Krzysztoszek, PhD, DSc principal investigator
Poznan University of Physical Education
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Green Prescription (Teacher-Led) and Green Prescription (Interdisciplinary) in people with Social Support and Screen Time, run by Poznan University of Physical Education at 1 site in Poland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 0 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 18 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Poland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in Moderate-to-Vigorous Physical Activity (MVPA) Screening Score (time frame: Baseline, immediately after the 12-week intervention, and 6 months after completion of the intervention.). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07770997, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 18 Aug 2026.