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Seasonality of physical activity, sedentary behavior and nighttime sleep duration in middle aged and elderly population of the Rotterdam Study

      Introduction: Physical activity (PA) and sedentary behavior (SB) have a seasonal pattern, with more PA in summer and more SB in winter. However, few studies have addressed the relation between these patterns and the role of nighttime sleep duration, and the effect of meteorological factors. Moreover, it is not clear at what extent a seasonal pattern can modify life expectancy (LE). We aimed to examine the seasonality of objectively measured light, moderate-to-vigorous PA, SB and nighttime sleep duration in a sample of middle-aged (50–64 years), young-elderly (65–74 years) and old-elderly (≥75 years) participants; to examine the association with meteorological factors; and to estimate the potential seasonality of LE along with the seasonal pattern of activity levels.
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