Objectively Measured Physical Activity and Cognitive Function in Older Adults.

Purpose: Emerging evidence suggests physical activity (PA) is associated with cognitive function. To overcome limitations of self-report PA measures, this study investigated the association of accelerometer-measured PA with incident cognitive impairment and longitudinal cognition among older adults. Methods: Participants were recruited from the cohort study, REasons for Geographic and Racial Differences in Stroke (REGARDS), in U.S. Accelerometers provided PA measures, including percent of total accelerometer wearing time spent in moderate-to-vigorous intensity PA (MVPA%), light-intensity PA and sedentary time, for 4-7 consecutive days at baseline. Cognitive impairment was defined by Six-Item Screener. Letter fluency, animal fluency, word list learning and Montreal Cognitive Assessment (orientation and recall) were conducted to assess executive function and memory. Results: Participants (N=6,452, 69.7 +/- 8.5 yr, 55.3% women, 30.5% black) with usable accelerometer and cognition measures spent extremely limited time in MVPA (1.5% +/- 1.9% of accelerometer wearing time). During an average of 3 years of follow-up, 346 cases of incident cognitive impairment were observed. After adjustments, participants in higher MVPA% quartiles had a lower risk of cognitive impairment (i.e. Quartile 2: OR=0.64, 95% CI: 0.48-0.84), and better maintenance in executive function (>=0.03 z-score units) and memory (>=0.12 z-score units), compared with Quartile 1 (P

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