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R A N N S Ó K N
ENGLISH SUMMARY
Introduction: Physical activity and sleep are major determinants of
overall health. According to international recommendations, ado-
lescents should engage in moderate to vigorous physical activity for
at least 60 min each day and sleep eight to ten hours each night. The
association between physical activity and sleep in adolescents is not
well known. The aim of the study was to estimate a) the proportion of
Icelandic adolescents that achieves recommended physical activity and
sleep, b) if there is an association between physical activity and sleep
patterns, and c) sex differences in physical activity and sleep.
Material and methods: A total of 411 adolescents from the 10th grade in
six schools in Reykjavik were invited to participate in a cross-sectional
study in the spring of 2015. Valid data was obtained from 106 boys and
160 girls. Objective and subjective measures of physical activity and
sleep were made by wrist-worn accelerometers and a questionnaire.
Results: Almost half of the participants fulfilled the physical activity
recommendations according to the questionnaire. Although 51.1%
reported usually getting enough sleep, only 22.9% achieved the
recommended sleep length according to objective assessment. No
associations were observed between sleep and subjective physical
activity. Girls had higher accelerometer-measured physical activity
than boys on non-school days (p<0.01), but weekly averages were not
different between sexes. Girls and boys did not differ in subjective or
objective measures of sleep.
Conclusion: The behavior of Icelandic adolescents does not reflect
recommended amount of sleep and physical activity. Only 22.9%
obtained the recommended sleep length and just 11.3% fulfilled
recommendations of both sleep and physical activity.
Physical activity and sleep in Icelandic adolescents
Vaka Rögnvaldsdóttir1, Berglind M. Valdimarsdóttir1, Robert J. Brychta2, Soffía M. Hrafnkelsdóttir1, Sigurbjörn Á. Arngrímsson1, Erlingur Jóhannsson1, 3,
Kong Y. Chen2, Sigríður L. Guðmundsdóttir1
1Center of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland, 2Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney
Diseases, Bethesda Maryland, USA, 3Department of Sport and Physical Activity, Bergen University College, Bergen, Norway.
Key words: Physical activity, sleep, accelerometers, adolescents.
Correspondence: Sigríður L. Guðmundsdóttir, slg@hi.is