Abstract MP028: Bi-directional Relationship Between Sleep and Sedentary Behavior in Adults Who Are Overweight and Obese
Introduction: It is assumed that inadequate sleep is associated with sedentary behavior and that being active during the day improves sleep. Given the emergence of sedentary behavior as an independent risk factor for cardiovascular disease (CVD), a better understanding of this bi-directional relationship in adults who are obese is needed for developing CVD-risk reducing interventions.
Hypotheses: Total sleep time (TST) is negatively associated with next day sedentary time (SED) and SED is negatively associated with that night’s TST in adults who are obese.
Methods: We used objective baseline data from the EMPOWER Study, a 12-mo study of lapses during weight loss. We instructed subjects to wear accelerometers on the waist (ActiGraph GT3X) for 7 days and wrist (Actiwatch 2) for 14 days to assess daily activity and sleep, respectively. Subjects with ≥2 weekdays and 2 weekend days of overlapping data were included. SED was defined as <150 counts/min. Linear mixed modeling was used to examine the associations between TST and SED; each directional relationship was examined separately. Covariates included sex, race, body mass index (BMI), age, and day of the week.
Results: The majority of subjects (N=109) were white (82.6%), employed (92.6%), and female (89.0%) with mean (±SD) age of 50.6±10.6 years and BMI of 33.8±4.6 kg/m2. Mean daily TST and SED were 409.5±83.0 min and 638.8±132.2 min, respectively. Previous night’s TST independently predicted the next day’s SED (p<.001) with each 3 min increase in TST being associated with a 1 min decrease in SED. SED did not predict that night’s TST. Weekends were associated with less SED (p<.001) and greater TST (p<.001; see Table).
Conclusions: Sedentary behavior and decreased TST were prevalent in this sample of mostly middle-aged working women. Less TST was associated with greater SED and weekdays were associated with greater SED and less TST, highlighting how weekdays influences these behaviors. These findings point to a need for interventions to increase TST in an effort to reduce SED and CVD risk.
Author Disclosures: C.C. Imes: None. C.E. Kline: None. B. Rockette-Wagner: None. L.M. Baniak: None. D.D. Mendez: None. E.R. Chasens: None. S.M. Sereika: None. L.E. Burke: None.
- © 2017 by American Heart Association, Inc.