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Abstract

Objective Conducting health research with adolescents involves navigating complex challenges at both organisational and individual levels. As part of evaluating the EACH-B (Engaging Adolescents with Changing Behaviour) intervention—a school-based randomised controlled trial aimed at improving diet and physical activity in adolescents, we explored researchers’ insider experiences of programme implementation. The study investigates real-world implementation challenges and protocol adaptations in the EACH-B trial to provide practical guidance for public health interventions in schools. Applying the Consolidated Framework for Implementation Research (CFIR), data were collected through semi-structured interviews and focus groups with 10 members of the research team.

Results Researchers identified significant barriers within the ‘Inner’ settings (internal research processes) and ‘Outer’ settings (external school environment and policy landscape). Research delivery was hindered by post-pandemic school priorities—specifically academic recovery and mental health support which limited the feasibility of maintaining adolescent engagement and school access. Researcher-led adaptations emerged as a critical, yet often hidden, component of maintaining trial fidelity. The study concludes that reflexive ‘insider’ perspectives and flexible designs are essential to align research with shifting school priorities. These adaptive strategies provide a blueprint for
more resilient and feasible public health interventions

Publication Type:	Article
Additional Information:	© The Author(s) 2026. Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creati vecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords:	Adolescent health, CFIR, COVID-19, Implementation science, Process evaluation, Public health, Researcher reflexivity, School-based interventions, 0601 Biochemistry and Cell Biology, 1199 Other Medical and Health Sciences, Bioinformatics, 32 Biomedical and clinical sciences
Subjects:	L Education > LB Theory and practice of education > LB1603 Secondary Education. High schools R Medicine > RA Public aspects of medicine R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
Departments:	School of Health & Medical Sciences School of Health & Medical Sciences > Department of Population Health & Policy
SWORD Depositor:	Symplectic Administrator

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