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Objectives Although extensive evidence demonstrates the benefits and safety of exercise and interventions promoting physical activity (PA) in people with inflammatory arthritis (IA) or osteoarthritis (OA), the evidence regarding interventions targeting and measuring sedentary behaviour (SB) reduction is scarce. This systematic review and a meta-analysis investigated the extent to which interventions targeting increases in PA and/or reductions in SB lead to changes in device-measured SB among people with IA or OA. Methods This work informs the 2025 update of the European Alliance of Associations of Rheumatology recommendations on PA and SB in people with IA or OA. Databases were searched for eligible randomised controlled trials up to April 2024. Included studies were coded for behaviour change techniques (BCTs) targeting PA and/or SB. Data on changes in device-measured SB from baseline were pooled using a random-effects model and presented as minutes per day. Results Seven studies, with a total of 705 participants, were included. Cumulatively, there was no significant effect of interventions on SB (difference in change –25.00 min/d [95% CI: −62.54 to 12.55]). Comparative subgroup analyses indicated that the effects of interventions did not differ ( P = .83) by whether BCT content targeted SB directly, targeted SB indirectly via changes in PA, or targeted SB both directly and indirectly. Conclusions There is limited evidence for the effect of interventions on SB in people with IA or OA. More studies testing movement behaviour interventions should measure SB data as an outcome.
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Osthoff et al. (2026) studied this question.