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Life sciences · Interventional Study
ClinicalTrials.gov · October 30, 2026
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Interventional Study.
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Registry record from ClinicalTrials.gov (NCT06547567). This is a study registration, not published results. Lead sponsor: Peking University. Recruitment status: COMPLETED. Phase: NA. Study type: INTERVENTIONAL. Enrollment: 705 participants (ACTUAL). Conditions: Pediatric Obesity. Interventions: OTHER: MI chatbot Intervention; OTHER: General-counseling chatbot intervention; OTHER: Graphic-text intervention; OTHER: Video intervention. Primary outcome measures: Behavior Change Motivation , Baseline, Immediately after the intervention (approximately 30 minutes after baseline); Depressive symptoms , Baseline, 1 week after the end of the intervention, and 8 weeks after the end of the intervention.; Anxiety symptoms , Baseline, 1 week after the end of the intervention, and 8 weeks after the end of the intervention.. Brief summary: The goal of this cluster-randomized clinical trial is to learn whether digital interventions, especially a motivational interviewing (MI) chatbot can improve adolescents' physical activity motivation and behavior, as well as support their mental health. The main questions it aims to answer are: * Does the MI chatbot improve how important participants consider physical activity, their confidence in becoming more active, and their readiness to do so? * Does the digital interventions improve their mental health? Researchers will compare the chatbot, text and video intervention groups with a blank control group. Particularly, an MI chatbot will be compared with a general-counseling chatbot. School classes will be randomly assigned to one of the arms. Participants will: * Complete baseline questionnaires about their characteristics, physical activity, and motivation. * Have a conversation about physical activity with their assigned chatbot, or watch a graphic-text poster, or a video. * Complete a post-test questionnaires after the intervention.