0269 Restricting Sleep Increases Teens’ Sedentary Behavior Without Impacting Moderate to Vigorous Physical Activity

• Published in: Sleep (New York, N.Y.) N.Y.), 2020-05, Vol.43 (Supplement_1), p.A102-A103
• Main Authors: Krietsch, K, Duraccio, K, Zang, N, Beebe, D
• Format: Article
• Language: English
• Subjects: Behavior; Exercise; Sedentary behavior; Sleep; Teenagers
• ISSN: 0161-8105; 1550-9109
• DOI: 10.1093/sleep/zsaa056.267

Abstract Introduction Short sleep duration has been linked to obesity risk in adolescence. However, most research has focused on potential changes in appetite/intake, rather than physical activity or sedentary behaviors. It remains unknown if, in the daily lives of adolescents, sleep restriction increases moderate- to-vigorous physical activity (e.g., by providing more time for it) or discourages such activity (in favor of sedentary behaviors). This was the first study to use gold-standard objective measures to assess cause-and-effect relationships between sleep duration and the resulting activity levels of adolescents in the naturalistic environment. Methods N=104 healthy teens (ages 14–18) completed the 3-week within-subjects crossover sleep manipulation experiment during the summer. Following a 7-night a sleep stabilization week, teens were randomly assigned to 5 nights in Short Sleep (6.5hrs sleep opportunity) or Healthy Sleep (9.5hrs sleep opportunity). Following a 2-night “washout” period, they crossed over to the alternate sleep condition. Throughout the study, they wore validated waist-worn accelerometers to objectively measure sedentary and physical activity levels, and wrist-worn actigraphs to confirm adherence to their sleep condition. Results When in Short Sleep (vs. Healthy Sleep), teens on average slept 112 minutes less (p