The relationship between sleep and sedentary time, and the impact of varying sleep patterns

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2017-01-01
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Nelson, Claudia
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Laura D. Ellingson
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Kinesiology
The Department of Kinesiology seeks to provide an ample knowledge of physical activity and active living to students both within and outside of the program; by providing knowledge of the role of movement and physical activity throughout the lifespan, it seeks to improve the lives of all members of the community. Its options for students enrolled in the department include: Athletic Training; Community and Public Health; Exercise Sciences; Pre-Health Professions; and Physical Education Teacher Licensure. The Department of Physical Education was founded in 1974 from the merger of the Department of Physical Education for Men and the Department of Physical Education for Women. In 1981 its name changed to the Department of Physical Education and Leisure Studies. In 1993 its name changed to the Department of Health and Human Performance. In 2007 its name changed to the Department of Kinesiology. Dates of Existence: 1974-present. Historical Names: Department of Physical Education (1974-1981), Department of Physical Education and Leisure Studies (1981-1993), Department of Health and Human Performance (1993-2007). Related Units: College of Human Sciences (parent college), College of Education (parent college, 1974 - 2005), Department of Physical Education for Women (predecessor) Department of Physical Education for Men
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The purpose of this study was to determine the directionality of the relationships between sleep and sedentary time, and the consistency of these relationships across varying sleep patterns. Sleep duration and total sedentary time were assessed daily in men (n = 19; aged 32.5 + 3.9; 28.8 + 3.4 BMI) over three 14-day conditions. For all conditions, participants were given ActivPAL and SenseWear Armband monitors to measure sedentary, active, and sleep behaviors; during each condition, monitors were worn as close to 24-hours per day as possible. Data was analyzed via statistical analysis software to determine correlation coefficients and regression significance between sleep duration and total sedentary time.

Our results indicate an inverse relationship between sleep duration and its prediction of sedentary time on subsequent days, though no evidence was found of a relationship between sedentary time and the subsequent sleep bout (Table 2; p-value = <0.0001 and 0.3561, respectively). Results were found to be heterogeneous across individuals indicating that the strength of the association varies between people (Table 3; p-value = 0.0002). When investigating the effects of varying sleep patterns, neither weekday versus weekend or sleep timing were found to have a significant impact on the relationship (Table 2; Day of week

p-value = 0.9248; Sleep timing p-value = 0.5105). We determined that there is a significant difference between sleep duration, specifically, on the week days versus weekend days (Appendix B.3; p-value < 0.0001), and between sedentary time for morning and evening chronotypes (Appendix B.4; p-value < 0.0001).

Through this project we learned that there is a relationship between sleep duration and sedentary time that is unique to individuals and not impacted by varying sleep patterns. Further research in this field should use a larger sample size to better understand the longitudinal and acute relationships between sleep duration and sedentary time, as well as to better investigate the effect of daily and habitual sleep patterns on these relationships. Future studies should explore the impact these variables have across groups and within individuals to better determine the heterogeneity of these associations.

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Sun Jan 01 00:00:00 UTC 2017