Changes in Subjective Cognitive and Social Functioning in Parkinson's Disease from Before to During the COVID-19 Pandemic.

Social isolation and health-related consequences of the COVID-19 pandemic may have significantly impacted quality of life in people with Parkinson's disease (PwPD). The effect of the COVID-19 pandemic specifically on subjective cognition and social functioning in PwPD is poorly understood. We conducted a longitudinal analysis of changes in subjective cognitive and social functioning in PwPD before (T1, 2017-2019) and during (T2, 2021) the COVID-19 pandemic. At T1, 347 PwPD completed online surveys. At T2, 123 of them (54 males, 69 females) responded to follow-up questionnaires including Quality of Life in Neurological Disorders (Neuro-QoL) subscales, Beck Depression Inventory-II, Parkinson's Anxiety Scale, motor and non-motor experiences of daily living from the MDS-Unified Parkinson's Disease Rating Scale, and the Coronavirus Impact Scale. T1-T2 declines in subjective cognition and social functioning both were correlated with more anxiety, fatigue, and motor symptoms. Additionally, declines in subjective cognition correlated with depression, and with decline in social functioning. Women reported greater COVID-19 impact than men, unrelated to cognition and social functioning; in men, personal experience with COVID-19 was associated with decline in subjective cognition. Our finding that subjective cognition and social functioning are associated with different motor and non-motor symptoms of PD suggests that the impacts of PD on subjective cognition and social functioning are complex, which has important implications for treatment.