Browsing Háskóli Íslands by Author "Johannsson, Erlingur"

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

Rögnvaldsdóttir, Vaka; Brychta, Robert; Hrafnkelsdóttir, Soffía M.; Chen, Kong Y.; Arngrímsson, Sigurbjörn Árni; Johannsson, Erlingur; Gudmundsdottir, Sigridur Lara (Public Library of Science (PLoS), 2020-05-15)

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, ...
Serum 25-hydroxyvitamin D concentrations in 16-year-old Icelandic adolescent and its association with bone mineral density

Gudmundsdottir, Sigridur Lara; Hrafnkelsson, Hrafn; Sigurdsson, Engilbert; Johannsson, Erlingur (Cambridge University Press (CUP), 2020-03-19)

Objective: The aim of the study was to assess the potential association between serum 25-hydroxyvitamin D (25(OH)D) and whole-body bone mineral density (BMD) among 16-year-old adolescents and to study the prevalence of 25(OH)D insufficiency, defined ...

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