Dynamic Coupling Association of Care Partner Quality of Life and Cognitive and Depressive Symptoms Experienced by Persons Living with Dementia

Background/Objectives: Persons living with dementia (PLwD) receive informal care services from loved ones, commonly referred to as care partners (CPs). While the symptoms (e.g., depressive affect, cognitive impairment) experienced by PLwD are recognized to influence CP wellbeing, longitudinal investigations into the association of CP QoL and PLwD symptoms have yet to be fully explored. The present study sought to address this gap and highlight how CP QoL and PLwD symptoms systematically covary over time. Methods: Participants were composed of 33 dyads (PLwD and their CP) who partook in the Voices in Motion project, a social-cognitive intervention for dementia. CP QoL (WHOQOL-BREF), PLwD depressive symptomology (Patient Health Questionnaire-9) and PLwD global cognitive functioning (Mini-Mental State Examination) were assessed every three to four weeks in an intensive repeated-measures design. Time-varying covariation models using multilevel modeling examined systematic covariation between CP QoL and PLwD symptoms between and within dyads. Results: Increased CP psychological and social QoL were both associated with increased PLwD global cognitive functioning between dyads and vice versa (p < 0.05). Within dyads, increased CP social QoL was associated with improved PLwD depressive symptoms (p < 0.05), while increased CP environmental QoL was associated with increased depressive symptoms (p < 0.05). Conclusions: Significant coupling associations were observed both between and within dyads. Such results highlight the association between CP QoL and the symptoms experienced by their care recipient and provide important, novel longitudinal contributions to the literature.