Research visit
During the visit, conducted in a university movement laboratory, the following self-reported disease-specific questionnaires were collected: Bath AS Functional Index (BASFI), composed of 10 questions about functional limitation; the Bath AS Disease Activity Index (BASDAI), composed of six questions pertaining to fatigue, spinal pain, joint pain/swelling, areas of localised tenderness and morning stiffness; and the Bath AS Patient Global score (BAS-G) which asks about the person’s well-being over the past week and the past six months. Along with height and weight, spatiotemporal gait data was captured using an IMU (LPMS-B2, Life Performance Research, Japan) placed on projected centre of mass (L4). The standardised index of functional tests (Table 1) was instructed and measured by an experienced physiotherapist, then performed and captured by video recording for CV-aided analysis. Following the laboratory research visit, the participant performed and captured video of the same index of tests at their home using a personal smartphone camera, tablet camera or webcam. (Figure 1)