Source:Sleep Medicine
Author(s): Tori R. Van Dyk, Kendra N. Krietsch, Brian E. Saelens, Catharine Whitacre, Shealan McAlister, Dean W. Beebe
Objectives/BackgroundShort sleep duration during adolescence is associated with increased dietary intake and greater risk for overweight/obesity. However, findings are mixed on the relationship between sleep and physical activity during the school year, when short sleep is most common. Further, there is concern that increasing sleep may interfere with opportunities for physical activity, yet this has not been directly tested. This study examined the impact of an at-home experimental sleep extension protocol on physical activity during the school year among short-sleeping adolescents.Participants/MethodsParticipants included 18 adolescents (67% female, 78% white) who reported regularly sleeping 5-7 hours on school nights. Adolescents completed a 5-week, at-home sleep manipulation with an initial baseline week followed in randomized, counterbalanced order by two experimental conditions, each lasting two weeks. During prescribed habitual sleep (HAB), bedtimes and rise times were set to match the baseline sleep pattern, and during sleep extension (EXT) adolescents were instructed to increase time in bed on school nights by 1.5 hours per night relative to baseline. Wrist-mounted actigraphy monitored sleep and waist-mounted accelerometers measured daytime physical activity.ResultsAdolescents averaged 71 minutes more sleep on school nights during EXT compared to HAB (p<.001). During HAB, adolescents spent more time in sedentary behavior (p=.002) than during EXT, but there were no cross-condition differences in light (p=.184) or moderate-to-vigorous activity (p=.102).ConclusionsExtending sleep on school nights in short-sleeping teens reduces time spent in sedentary behavior, without negatively impacting health-promoting moderate-to-vigorous physical activity.
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