0855 PHYSICAL ACTIVITY AND SLEEP HEALTH: AN ASSOCIATION BETWEEN INTENSITY NOT VOLUME

Physical activity (PA) has been associated with several dimensions of sleep, including sleep satisfaction and daytime alertness. However, the association between PA and sleep health, a multidimensional construct that characterizes sleep among all individuals, has not been explored. This analysis examined the relationship between different measures of physical activity and a composite measure of sleep health. 115 adults (66% Female, 60.2 ± 9.1 yr, body mass index [BMI]: 29.7 ± 6.7 kg·m-2) were included in the analysis. Participants reported their daily time in light- (LPA), moderate-, and vigorous-intensity physical activity (MVPA) via diary and wore a pedometer (Omron HJ-720ITC) to measure total daily steps for 5–14 days (mean: 9.8 days). Sleep health was measured using the RU_SATED questionnaire, which quantifies regularity, satisfaction, timing, efficiency, and duration of sleep and daytime alertness. Sleep health scores ranged from 0–12, with higher scores reflecting greater sleep health. Multiple linear regression analyses were used to examine the relationship between physical activity measures and sleep health, with analyses adjusted for age, race, gender, BMI, depression history, socioeconomic status, and existing cardiovascular disease. The mean sleep health score was 9.6 ± 2.4. Participants averaged 62.4 ± 66.0 min of LPA, 44.7 ± 47.6 min of MVPA, and 5689.9 ± 3086.0 steps per day. Self-reported LPA and MVPA were significantly correlated (r=.33, P<.01), but pedometer-assessed daily steps were not correlated with either LPA or MVPA. MVPA was significantly associated with sleep health (β=.31, P<.01). In contrast, self-reported LPA and daily pedometer steps were not related to sleep health (β=.07 [P=.46], β=.06 [P=.58], respectively). In older adults, higher intensity activity (i.e., MVPA), but not lower intensity activity (LPA) or total volume of activity (pedometer steps), was associated with greater sleep health. Although we cannot infer directionality from these results, physical activity intensity may have a greater effect on sleep health than volume of activity. NIH grants R01HL104607 (PI: Hall) and K23HL118318 (PI: Kline).