Elena Schmitz

Background: The World Health Organization (WHO) recommends 150-300 minutes of moderate physical activity (PA) per week (approximately 7,000-10,000 steps/day). In Germany, fewer than half of all adults achieve this goal. This highlights the need for population-based intervention approaches to promote regular daily PA. The aims of this replication study are to adapt, implement and evaluate a community-based complex PA intervention originally developed and successfully implemented in Belgium. The following research questions are investigated: 1. Is the intervention ‘10,000 Steps Ghent’ adaptable and transferrable to the German context? 2. Is the intervention ‘10,000 Steps Duesseldorf’ effective for the promotion of PA among residents of city districts selected for the study compared to city districts of a control city? Methods: The intervention includes components at different intervention levels (i.e., individual level: website; organizational level: promotion of PA e.g., in companies, senior citizens’ associations; community level: media campaign, environmental changes, e.g., signage in parks). To investigate the effects of the intervention, PA-levels were assessed via telephone interviews and pedometers in two representative samples of adults aged 25-75 years in the cities of Duesseldorf (intervention) and Wuppertal (control) at baseline (April 2021 - March 2022). The one-year follow-up will start in May 2023. Results: 376 participants in the intervention and 253 in the control city districts completed baseline (60% female, 32% wore accelerometers in addition to the pedometers). First study results will be presented at the annual European Public Health Conference after the trial is completed. Conclusions: To our knowledge, this study is the first research project aiming to replicate the effects of a complex PA intervention successfully implemented in another European country. Key messages: • Results regarding the adaptation and transferability of a complex PA intervention originally developed and implemented in Belgium will be presented. • Results regarding the impact of the community-based complex intervention ‘10,000 Steps Duesseldorf’ on residents’ PA levels will be shown.

Background: The World Health Organization recommends 150 minutes of moderate to vigorous physical activity (PA), which translates to approximately 7000 to 10,000 steps per day for adults. In Germany, less than half of the population in this age range meets this recommendation, highlighting the need for population-based intervention approaches for promoting daily PA. Objective: The complex community-based PA intervention “10,000 Steps Ghent,” which was originally developed in Belgium and was shown to be effective for PA promotion, has been adapted for implementation and evaluation in 2 German cities. The original Belgian study is currently being replicated, and we aim to examine the effectiveness of the adapted intervention among adults living in intervention city districts in Duesseldorf when compared with those living in control city districts in Wuppertal, over the course of 1 year. Methods: A controlled intervention trial examining the effects of an intervention addressing multiple levels (eg, individual level: website; organizational level: PA promotion in companies; community level: media campaigns and environmental changes) is being conducted. PA and various secondary outcomes will be assessed in 2 random samples of adults aged 25 to 75 years (n=399 in each city) at baseline and after 1 year. Results: Funding for this study was obtained in March 2020. Recruitment for this study and baseline data collection were conducted from May 2021 to March 2022 (as of March 2022, 626 participants were enrolled in the study). The intervention will be implemented in Duesseldorf for 1 year from April 2022 onward, and follow-up assessments will be conducted, starting in May 2023 (until September 2023). Data analysis will be performed in fall 2023, and the results will be published in spring 2024. Conclusions: To our knowledge, this is the first research project (currently underway in Germany) that is aimed at replicating the effects of a complex intervention for PA promotion that was previously shown to be effective in another European country. Trial Registration: German Clinical Trials Register DRKS00024873; https://tinyurl.com/4c9e8azh