Promoting Work Ability With a Wearable Activity Tracker in Working Age Individuals With Hip and/or Knee Osteoarthritis: A Randomized Controlled Trial

Abstract

Background: Physical activity (PA) can improve work ability and health in individuals with hip and/or knee osteoarthritis (OA). The use of wearable activity trackers (WATs) has been shown to increase PA and improve other health outcomes but little is known concerning their effect on work ability. The objectives in this study was to examine the effect of self-monitoring PA with a WAT on work ability, PA and work productivity among individuals of working age with hip and/or knee OA.Methods: Individuals (n=160) were included and cluster-randomized to a Supported Osteoarthritis Self-management Program (SOASP) with the addition of self-monitoring PA using a commercial WAT for 12 weeks (n=86), or only the SOASP (n=74). Primary outcome was self-reported work ability measured with the Work Ability Index (WAI) and secondary outcomes were self-reported PA measured with the International Physical Activity Questionnaire – Short Form (IPAQ-SF) and work productivity, measured with the Work Productivity and Activity Impairment scale: Osteoarthritis (WPAI:OA) at baseline and after three, six and twelve months. Data was primarily analysed with linear mixed models.Results: Participants with data from baseline and at least one follow-up were included in the analyses (n=124). Linear mixed models showed no statistically significant difference between groups regarding pattern of change in work ability or PA, from baseline to follow-ups. Conclusion: The SOASP together with self-monitoring PA with a WAT did not have any effect on the primary outcome variable work ability. Participants already at baseline had good work ability and were physically active, probably thus reducing the possibility for improvements. Future interventions should target a population with lower work ability and PA-level.Trial registration: ClinicalTrials.gov, NCT03354091. Registered 15/11/2017, https://clinicaltrials.gov/ct2/show/NCT03354091