Beatriz Alves ^1* Pedro R. Mota ^2* Daniela Sineiro ^2* Ricardo Carmo ^2* Pedro Santos ^3,4* Patrícia Macedo ^3,5* João C. Carreira ^6* Rui Madeira ^3,4 Sofia B. Dias ^7* Carla M. Pereira ^6*

• ¹ School of Health, Polytechnic Institute of Setubal, Setúbal, Setubal, Portugal
• ² Escola Superior de Tecnologia de Setúbal, Instituto Politécnico de Setúbal, Setúbal, Portugal
• ³ Other, Setúbal, Portugal
• ⁴ NOVA Laboratory for Computer Science and Informatics, Faculty of Sciences and Technology, New University of Lisbon, Caparica, Portugal
• ⁵ Centre of Technology and Systems, Faculty of Sciences and Technology, New University of Lisbon, Caparica, Portugal
• ⁶ Comprehensive Health Research Center, New University of Lisbon, Lisboa, Portugal
• ⁷ Interdisciplinary Centre for the Study of Human Performance (CIPER), Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Dafundo 1499-002, Lisbon, Portugal, Lisbon, Portugal

Despite the effectiveness of exercise-based interventions on symptom management and disease progression, many people with Parkinson's Disease (PwPD) do not exercise regularly. In line with the ubiquitous use of digital health technology, the MoveONParkinson digital solution was developed, comprising a Web Platform and a Mobile App with a Conversational Agent (CA). The interface features were designed based on the principles of Social Cognitive Theory with the goal of fostering behavior change in PwPD for sustained exercise participation and improved disease management. Using a mixed methods approach, this study aimed to collect feedback, assess the acceptability of the Mobile App and the Web Platform, and evaluate the usability of the latter. Quantitative data, which included questionnaire responses and the System Usability Scale (SUS) scores, were analyzed using descriptive statistics, heatmaps, and correlation matrices. Qualitative data, comprising semi-structured and thinking-aloud interview transcripts, were subjected to an inductive thematic analysis. A total of 28 participants were involved in the study, comprising 20 physiotherapists (average age: 34.50±10.4), and eight PwPD (average age: 65.75±8.63; mean Hoehn & Yahr: 2.0 (±0.76)). Three main themes emerged from the thematic analysis of the interviews, namely: Self-management (Theme 1), User Engagement (Theme 2), and Recommendations (Theme 3). The assessment of the Mobile App and the CA (mean score: 4.42/5.0±0.79) suggests that PwPD were able to navigate this interface without notable difficulties. The mean SUS score of 79.50 (±12.40%) with a 95% confidence interval ranging from 73.70 to 85.30, reveal good usability. These findings indicate a high level of acceptability of the MoveONParkinson digital solution, serving as a foundation for assessing its impact on exercise engagement and, subsequently, its influence on symptom management and quality of life of PwPD.