Abstract MP41: Associations Between Reallocations of Daytime Movement Behaviors and Self-Reported Sleep Quality and Insomnia Severity in Desk Workers

Introduction: While moderate- to vigorous-intensity physical activity (MVPA) is commonly associated with better sleep, few studies have considered the influence of sedentary behavior (SB) or light-intensity PA (LPA) on sleep or how reallocation of these daytime movement behaviors are associated with sleep. Purpose: To examine the association of reallocating time spent in daytime movement behaviors (SB, LPA, MVPA) with self-reported sleep quality and insomnia severity. Methods: Using baseline data from a clinical trial, 170 adults with desk jobs were included in analyses (84.1% white; 51.2% female; body mass index BMI=31.1±6.6 kg/m 2 ; age=44.7±10.8 y). Daily SB and MVPA were measured with activPAL and ActiGraph GT3x accelerometers, respectively, over ~7 days; SB was categorized into short- and long-bout SB (time spent in 5) and 40.6% had at least mild-severity insomnia (ISI≥8). Reallocating time from short-bout SB to MVPA was significantly associated with better sleep quality (-0.73±0.37 unit change in PSQI score per 30-min reallocation P=.05); reallocations from long-bout SB or LPA to MVPA trended toward significantly better sleep quality (P=.08 and P=.09, respectively). Reallocating time from SB or LPA to MVPA was not significantly associated with lower insomnia severity (each P>.16). Conclusions: Increasing moderate-vigorous physical activity at the expense of sedentary behavior or light-intensity physical activity was associated with better sleep quality, though the strengths of these associations were mild at best. Support: NIH R01 HL134809, R01 HL147610.