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European Journal of Applied Physiology

, Volume 111, Issue 10, pp 2615–2623 | Cite as

Sleep duration and activity levels in Estonian and Swedish children and adolescents

  • Francisco B. Ortega
  • Jonatan R. Ruiz
  • Idoia Labayen
  • Lydia Kwak
  • Jaanus Harro
  • Leila Oja
  • Toomas Veidebaum
  • Michael Sjöström
Original Article

Abstract

We aimed to examine the associations of sleep duration with time spent on sedentary, moderate and vigorous activities in children and adolescents. The sample consisted of 2,241 (53.5% girls) Estonian and Swedish children (9–10 years) and adolescents (15–16 years), from the European Youth Heart Study, in 1998–1999. Sleep duration was calculated by the difference between self-reported bedtime and time for getting up on a normal weekday. Sedentary time/physical activity was measured by accelerometry (valid data on 1,462 participants). Adolescents had lower odds than children, and Swedish higher odds than Estonian, of meeting the sleep recommendations (>9 h) (OR = 0.22, 95% CI 0.17–0.27; and 1.32, 1.07–1.61, respectively). Participants sleeping longer than 10 h spent more time on physical activities (all intensities) and less time on sedentary activities than those sleeping shorter durations (all P < 0.001). The associations with physical activity became non-significant after additional adjustment for age or sexual maturation (Tanner stages), whereas the associations with sedentary time became borderline significant (P = 0.09/0.03, for age and Tanner, respectively). In conclusion, these results do not suggest a link between sleep durations and activity in a relatively large sample of children and adolescents from two European countries. Consequently, the common assumption that physical activity is a mediator in the relationship between short sleep durations and obesity is not supported by our findings.

Keywords

Sleep Exercise Childhood Adolescence 

Notes

Acknowledgments

We are grateful to the participants of the ECPBHS and their parents and the whole ECPHSC study team. We also thank the Swedish participants and families, as well as the EYHS field-work team. We also want to thank Charlotte Goodrose-Flores for the English revision. The study was supported by grants from the Stockholm County Council. This study was also supported by grants from the Estonian Ministry of Education and Science (No 0180027 and 0942706) and the Estonian Science Foundation (No 6932 and 6788). This study is also being supported by grants from the Spanish Ministry of Education (EX-2008-0641), Swedish Council for Working Life and Social Research (FAS), the Swedish Heart–Lung Foundation (20090635); and the Spanish Ministry of Science and Innovation (RYC-2010-05957).

Conflict of interest

None declared.

Supplementary material

421_2011_1883_MOESM1_ESM.doc (94 kb)
Supplementary material 1 (DOC 93 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Francisco B. Ortega
    • 1
    • 2
  • Jonatan R. Ruiz
    • 1
    • 3
  • Idoia Labayen
    • 4
    • 1
  • Lydia Kwak
    • 1
  • Jaanus Harro
    • 5
  • Leila Oja
    • 6
  • Toomas Veidebaum
    • 6
  • Michael Sjöström
    • 1
  1. 1.Unit for Preventive Nutrition, Department of Biosciences and Nutrition at NOVUMKarolinska InstitutetHuddingeSweden
  2. 2.Department of Medical PhysiologySchool of Medicine, University of GranadaGranadaSpain
  3. 3.Department of Physical Education and Sport, School of Physical Activity and Sport SciencesUniversity of GranadaGranadaSpain
  4. 4.Department of Nutrition and Food ScienceUniversity of the Basque CountryVitoriaSpain
  5. 5.Department of PsychologyEstonian Centre of Behavioral and Health Sciences, University of TartuTartuEstonia
  6. 6.Estonian Centre of Behavioral and Health Sciences, National Institute for Health DevelopmentTallinnEstonia

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