0164 Move Your Feet and Sleep: A Longitudinal Dynamic Analysis of Physical Activity, Sedentary Behavior, and Insomnia Symptoms

Abstract

Abstract Introduction Insomnia symptoms, which include sleep disturbances and daytime dysfunction, are associated with poor physical and mental health. Physical activity has been associated with good sleep while sedentary behavior has been associated with poor sleep. This study investigated whether physical activity and sedentary behavior are associated with insomnia symptoms both generally (i.e., between-persons, mean-level) and dynamically (i.e., within-persons, person-centered). Methods Participants (N=775) included adults (Mage=47.3 years,54.6% female) who completed an online longitudinal study investigating sleep and health across the lifespan at three time points (approximately 17-weeks apart). Participants reported: (a) their duration of moderate-to-vigorous physical activity per week (in minutes), (b) the percentage of their day spent sedentary, and (c) their insomnia symptoms via the Insomnia Severity Index which was scored according to traditional standards (i.e., total score) as well as proposed two factor scores: (1) Sleep Disturbance (items 1,2,3) and (2) Daytime Dysfunction (items 4,5,6,7). Multilevel modeling was used to examine the associations among physical activity, sedentary behavior, and insomnia symptoms at both between- and within-persons levels. Results No significant associations were observed among total ISI score or the factor scores, and minutes spent in moderate-to-vigorous physical activity (all p’s>.05). Sedentary behavior, however, was significantly associated with total ISI score at both the between-person and within-person levels (β=.02, t=2.71, p=.007; β=0.03, t=2.62, p=.009, respectively). For the Sleep Disturbance factor, between-person sedentary behavior was not a significant predictor while within-person sedentary behavior was associated with higher sleep disturbance scores (β=0.01, t=1.16, p=.245; β=.01, t=2.06, p=.039, respectively). For the Daytime Dysfunction factor, both between-persons and within-person levels of sedentary behavior were associated with increased daytime dysfunction (β=.02, t=3.30, p=.001; β=.01, t=2.53, p=.012). Conclusion Sedentary behavior appears to be a more robust predictor of insomnia symptoms than physical activity. Further, the association between sedentary behavior and insomnia symptoms was observed to be dynamic in that when an individual reported being more sedentary than customary, they also reported more insomnia symptoms. Future analyses should consider demographic variables and comorbid conditions to identify subgroups in which these associations are most pronounced. Support (if any) National Institute on Aging of the National Institutes of Health under Award Number K23AG049955 (PI: Dzierzewski).