Patients with an inflammatory rheumatic disease (IRD), are often faced with significant limitations in physical functioning. Illness representations are a key-factor of their illness-related experience. Our aim was to examine (a) whether illness representations can predict or only reflect IRD patients' physical functioning over time, and (b) the specific pathways through which representations and physical functioning at baseline are associated with representations and functioning at follow-up. Patients with rheumatoid arthritis (N = 54) or systemic lupus erythematosus (N = 58) participated in the two phases of the study, 1 year apart. According to the results, illness representations were rather predicted by physical functioning than the other way around. At the same time, illness representations at baseline and at follow-up seemed to form a chain that mediated the relation between physical functioning at baseline and 1 year later. These findings may help us better delineate the interplay between the ways patients understand their condition and adaptation to illness.
Keywords: Illness representations; Inflammatory rheumatic disease; Physical functioning; Rheumatoid arthritis; Self-regulation; Systemic lupus erythematosus.