Association between Social Interactions and Motor Function in Community Dwelling Older Japanese Adults

This longitudinal study explored the relationship between multifaceted social interactions and motor function among community-dwelling older Japanese adults over a period of 9 years (2011–2020). Utilizing data from the Community Empowerment and Care Cohort Study in suburban central Japan, the analysis included 304 participants aged 65 years and older. Social interaction was assessed using the Index of Social Interaction (ISI), and motor function was evaluated using the Kihon Checklist. Binary logistic regression revealed a significant positive association between social interaction and motor function, with a 35% higher likelihood of maintaining motor function for every one-point increase in ISI score (odds ratio [OR]: 1.35; 95% confidence interval [CI]: 1.03–1.59; P=.02). Among the ISI subscales, “Social Curiosity” exhibited the strongest association with motor function, with a one-point increase correlating with a 45% higher likelihood of maintaining motor function (OR: 1.45; 95% CI: 1.11–1.90; P=.01). These findings underscore the importance of fostering social engagement, particularly social curiosity, in promoting healthy aging and preserving motor function.