Feasibility of Long-Term Physical Activity Measurement With a Wearable Activity Tracker in Patients With Axial Spondyloarthritis: 1-Year Longitudinal Observational Study

Emil Eirik Kvernberg Thomassen   ^{1, 2} , MSc ;   Anne Therese Tveter   ^{1, 3} , Prof Dr ;   Inger Jorid Berg   ¹ , Dr med, PhD ;   Eirik Klami Kristianslund   ¹ , Dr med, PhD ;   Andrew Reiner   ⁴ , MSc ;   Sarah Hakim   ¹ , MD, PhD ;   Laure Gossec   ^{5, 6} , Dr med, Prof Dr ;   Gary J Macfarlane   ⁷ , Dr med, Prof Dr ;   Annette de Thurah   ^{8, 9} , MPH, Prof Dr ;   Nina Østerås   ^{1, 2} , Prof Dr

¹ Centre for Treatment of Rheumatic and Musculoskeletal Diseases, Diakonhjemmet Hospital, Oslo, Norway

² Faculty of Medicine, University of Oslo, Oslo, Norway

³ Department of Rehabilitation Science and Health Technology, OsloMet – Oslo Metropolitan University, Oslo, Norway

⁴ Oslo Centre for Biostatistics & Epidemiology, Oslo University Hospital, Oslo, Norway

⁵ INSERM, Institut Pierre Louis d’Epidémiologie et de Santé Publique, Sorbonne Université, Paris, France

⁶ Rheumatology Department Pitié-Salpêtrière Hospital, Assistance Publique – Hôpitaux de Paris, Paris, France

⁷ Aberdeen Centre for Arthritis and Musculoskeletal Health (Epidemiology Group), University of Aberdeen, Aberdeen, United Kingdom

⁸ Department of Rheumatology, Aarhus University Hospital, Aarhus, Denmark

⁹ Department of Clinical Medicine, Aarhus University, Aarhus, Denmark