Exploring the Relationship Between Sleep and Body Composition in Healthy Adult Females in North Dakota

Zach Johnson, Nathaniel Johnson, Sherri Stastny, Department of Health, Exercise, and Nutrition Science, North Dakota State University 1340 Administration Ave, Fargo, ND 58105

Purpose: The purpose of this research was to examine the relationship between the time spent with an accelerometer off (the “Sleep Window”) and tissue percent fat. 

Context: Americans sleep more than an hour less per night in 2020 than they did 80 years ago. In that same time, a host of body fat-related diseases such as diabetes, cancer, and cardiovascular disease have continued to be among the leading causes of death. An exploration of the relationship between sleep and excess body fat could be beneficial for recommendations geared towards lowering excess body fat.

Methodology: A total of 97 women (Age, 40.96 ± 18.00 ; Sleep Window, 8.82 ± 1.34 hour; Physical Activity, 456.57 ± 83.93 minutes/day; Energy intake, 30.59 ± 10.15 kcal/kg/day; Protein intake, 16.93 ± 4.99 % energy;  Body Fat, 35.41 ± 7.73 %) were included. Physical activity was recorded using Actigraph accelerometers worn on the wrist for seven days. Participants were instructed to wear the accelerometer during all waking hours.  Measurements of body composition and lean body mass were taken via DXA scan. All statistics were performed in SPSS. Only those with at least six days of recorded sleep were included in the analysis. A multiple linear regression model was used. 

Results: The model explained 20.7% of the variance in sample (F5,91 = 4.742; p = 0.001). When controlling for age, physical activity, relative energy intake, and protein intake, an additional one hour spent sleeping was related to 1.62 % increase in body fat (t = 2.399; p = 0.018). This positive correlation suggests that oversleeping may lead to excess body fat. However, a multitude of factors that relate to both sleeping more and excess body fat, but do not relate the two directly, such as depression could also explain this relationship. 

Additional Abstract Information

Presenter: Zachary Johnson

Institution: North Dakota State University

Type: Poster

Subject: Exercise Science & Nutrition

Status: Approved

Time and Location

Session: Poster 7
Date/Time: Tue 3:30pm-4:30pm
Session Number: 5039