The association of physical activity with loneliness, social isolation, and selected psychological protective factors among older adults.

The primary objectives were to investigate the association of physical activity levels with 1) loneliness and social isolation; 2) protective factors: resilience, purpose-in-life, and perception of aging; and 3) the impact of these factors on healthcare expenditure patterns across physical activity levels. The study sample was identified from adults age ≥65 who completed a health survey in 2018 or 2019 (N=6,652). Among survey respondents, the prevalence of low, moderate, and high physical activity levels was 29%, 31%, and 41%, respectively. Moderate and high physical activity were associated with 15%-30% lower likelihoods of loneliness and social isolation; and with 27% to 150% higher protective factors. In addition, physical activity was associated with the mitigation of increased healthcare expenditures associated with loneliness, social isolation, and low levels of protective factors. Thus, physical activity could serve as an intervention to reduce loneliness and social isolation, augment protective factors, and mitigate excess healthcare expenditures.