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We examined cross-sectional associations between physical function and device-based (activPAL) sedentary patterns and physical activity. Physical function tasks included time to complete 5 chair stands and walk a 10-foot gait speed course. We estimated associations using linear regression models adjusting for age and sex; coefficients represent estimated change in mean activPAL measures associated with each second increase in gait/chair stands time. Longer gait speed times were associated with more total sitting time (b=0.19, p < 0.01), fewer steps (b=-788.0, p<0.001), fewer sitting breaks (b=-1.7, p<0.01), and more prolonged sitting bouts (b=0.19, p<0.01). Longer chair stand times were associated with more total sitting time (b=0.06, p<0.001), less standing time (b=-0.04, p<0.01), fewer steps (b=-176.8, p<0.001), fewer sitting breaks (b=-0.45, p<0.01), and more prolonged sitting bouts (b=0.07, p<0.001). Prolonged patterns of sitting time and higher total sitting time, in addition to lower physical activity, were consistently associated with worse physical function.

SITTING PATTERNS, PHYSICAL ACTIVITY, AND PHYSICAL FUNCTIONING IN OLDER ADULTS