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Less physical activity and more varied and disrupted sleep is associated with a less favorable metabolic profile in adolescents

Less physical activity and more varied and disrupted sleep is associated with a less favorable metabolic profile in adolescents


Title: Less physical activity and more varied and disrupted sleep is associated with a less favorable metabolic profile in adolescents
Author: Rögnvaldsdóttir, Vaka   orcid.org/0000-0003-4244-3152
Brychta, Robert   orcid.org/0000-0001-9491-7968
Hrafnkelsdóttir, Soffía M.
Chen, Kong Y.
Arngrímsson, Sigurbjörn Árni
Johannsson, Erlingur   orcid.org/0000-0002-8028-7851
Gudmundsdottir, Sigridur Lara   orcid.org/0000-0002-6189-5894
Date: 2020-05-15
Language: English
Scope: e0229114
University/Institute: Háskóli Íslands
University of Iceland
Department: Rannsóknarstofa í íþrótta- og heilsufræði (HÍ)
Research Centre for Sport and Health Sciences (UI)
Series: PLOS ONE;15(5)
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0229114
Subject: Sleep; Physical activity; Adolescents; Insulin; Blood pressure; Svefn; Hreyfing (heilsurækt); Ungt fólk; Heilsufar
URI: https://hdl.handle.net/20.500.11815/2362

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Citation:

Rognvaldsdottir V, Brychta RJ, Hrafnkelsdottir SM, Chen KY, Arngrimsson SA, Johannsson E, et al. (2020) Less physical activity and more varied and disrupted sleep is associated with a less favorable metabolic profile in adolescents. PLoS ONE 15(5): e0229114. https://doi.org/10.1371/journal.pone.0229114

Abstract:

Background: Sleep and physical activity are modifiable behaviors that play an important role in preventing overweight, obesity, and metabolic health problems. Studies of the association between concurrent objective measures of sleep, physical activity, and metabolic risk factors among adolescents are limited. Objective: The aim of the study was to examine the association between metabolic risk factors and objectively measured school day physical activity and sleep duration, quality, onset, and variability in adolescents. Materials and methods: We measured one school week of free-living sleep and physical activity with wrist actigraphy in 252 adolescents (146 girls), aged 15.8±0.3 years. Metabolic risk factors included body mass index, waist circumference, total body and trunk fat percentage, resting blood pressure, and fasting glucose and insulin levels. Multiple linear regression adjusted for sex, parental education, and day length was used to assess associations between metabolic risk factors and sleep and activity parameters. Results: On average, participants went to bed at 00:22±0.88 hours and slept 6.2±0.7 hours/night, with 0.83±0.36 hours of awakenings/night. However, night-to-night variability in sleep duration was considerable (mean ± interquartile range) 0.75±0.55 hours) and bedtime (0.64±0.53 hours) respectively. Neither average sleep duration nor mean bedtime was associated with any metabolic risk factors. However, greater night-to-night variability in sleep duration and bedtime was associated with higher total body and trunk fat percentage, and less physical activity was associated with higher trunk fat percentage and insulin levels. Conclusion: Greater nightly variation in sleep duration and in bedtime and less physical activity were associated with a less favorable metabolic profile in adolescents. These findings support the idea that, along with an adequate amount of physical activity, a regular sleep schedule is important for the metabolic health of adolescents.

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