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This study examined how social engagement (SE) and mild cognitive impairment (MCI) influence changes in mobility over three years of follow-up. We performed a secondary analysis of longitudinal data among primary care patients aged >64 years (N=430). Mobility outcomes include performance-based function via the Short Physical Performance Battery (SPPB) and patient reported function via the Late-Life Function Instrument (LLFI). Independent variables include: 1) MCI determined by a comprehensive cognitive battery and scores 1.5 SD < age-adjusted mean; 2) SE measured by standardized self-report of social activities. Multivariate linear mixed regression models demonstrate that MCI is associated with lower scores on SPPB and LLFI (β= -0.76, p<0.0001; β= -1.47, p=0.005 respectively). SE is associated with higher scores on SPPB and LLFI (β=0.56, p<0.0001; β= 1.95, p<0.0001 respectively), and partially mediates the association between MCI and on each outcome. SE is linked to mobility decline especially among participants with MCI.

SOCIAL ENGAGEMENT, COGNITIVE IMPAIRMENT, AND MOBILITY IN THE BOSTON REHABILITATIVE IMPAIRMENT STUDY OF THE ELDERLY