Blar i HVL Open på forfatter "Johannsson, Erlingur"
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Association between free-living sleep and memory and attention in healthy adolescents
Stefansdóttir, Runa; Gundersen, Hilde; Rögnvaldsdóttir, Vaka; Lundervold, Alexander Selvikvåg; Gestdóttir, Sunna; Gudmundsdóttir, Sigridur Lara; Chen, Kong Y.; Brychta, Robert J.; Johannsson, Erlingur (Peer reviewed; Journal article, 2020)In laboratory studies, imposed sleep restriction consistently reduces cognitive performance. However, the association between objectively measured, free-living sleep and cognitive function has not been studied in older ... -
D-vítamínbúskapur íslenskra barna og ungmenna Langtímarannsókn
Gunnarsdottir, Berglind; Hrafnkelsson, Hannes; Johannsson, Erlingur; Sigurdsson, Emil L. (Peer reviewed; Journal article, 2020)TILGANGUR D-vítamín er mikilvægt fyrir vöxt og líkamlegan þroska barna, ekki eingöngu til að bæta beinheilsu heldur einnig vegna áhrifa þess á aðra starfsemi líkamans. Embætti landlæknis ráðleggur að D-vítamínþéttni í ... -
Different cardiorespiratory fitness expressions based on the maximal cycle ergometer test show no effect on the relation of cardiorespiratory fitness to the academic achievement of nine-year-olds
Saevarsson, Elvar; Svansdottir, Erla; Arngrimsson, Sigurbjorn; Sveinsson, Thorarinn; Johannsson, Erlingur (Journal article; Peer reviewed, 2018)The relationship between cardiorespiratory fitness and academic achievement has been inconclusive. The results may depend on how cardiorespiratory fitness is expressed. The aim of this study is to explore the impact of ... -
Different factors associate with body image in adolescence than in emerging adulthood: A gender comparison in a follow-up study
Gestsdottir, Sunna; Svansdottir, Erla; Sigurdsson, Hedinn; Arnarsson, Arsaell; Ommundsen, Yngvar; Arngrimsson, Sigurbjorn; Sveinsson, Thorarinn; Johannsson, Erlingur (Journal article; Peer reviewed, 2017)Background: Body image dissatisfaction has been linked with a range of adverse psychosocial outcomes in both genders and has become an important public health issue. Across all ages, women have reported being more dissatisfied ... -
Dynamic sitting: Measurement and associations with metabolic health
van der Berg, Julianne D.; Stehouwer, Coen D.A.; Bosma, Hans; Caserotti, Paolo; Eiríksdóttir, Gudny; Arnardóttir, Nanna Y.; van Domelen, Dane R.; Brychta, Robert J.; Chen, Kong Y.; Sveinsson, Thorarinn; Johannsson, Erlingur; Launer, Lenore J.; Gudnason, Vilmundur; Jonsson, Palmi V.; Harris, Tamara B.; Koster, Annemarie (Peer reviewed; Journal article, 2019)Dynamic sitting, such as fidgeting and desk work, might be associated with health, but remains difficult to identify out of accelerometry data. We examined, in a laboratory study, whether dynamic sitting can be identified ... -
Health and well-being of university students before and during COVID-19 pandemic: A gender comparison
Gestsdottir, Sunna; Gísladóttir, Þórdís; Stefansdottir, Runa; Johannsson, Erlingur; Jakobsdottir, Greta; Rognvaldsdottir, Vaka (Peer reviewed; Journal article, 2021)Objective COVID-19 has affected people’s health in various ways. University students are a particularly sensitive group for mental and physical health issues. The aim of this study was to assess and compare the mental and ... -
Less physical activity and more varied and disrupted sleep is associated with a less favorable metabolic profile in adolescents
Rognvaldsdottir, Veka; Brychta, Robert J.; Hrafnkelsdottir, Soffia M; Chen, Kong Y.; Arngrimsson, Sigurbjorn Arni; Johannsson, Erlingur; Gudmundsdottir, Sigridur Lara (Peer reviewed; Journal article, 2020)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 ... -
Organized sport participation, physical activity, sleep and screen time in 16-year-old adolescents
Sævarsson, Elvar Smári; Rögnvaldsdóttir, Vaka; Stefánsdóttir, Rúna; Johannsson, Erlingur (Peer reviewed; Journal article, 2021)This study aimed to examine the association of different frequencies of organized sport participation (OSP) with physical activity, cardiorespiratory fitness, body composition, sleep, and screen time among adolescents. A ... -
The Role of Perceived Competence in Determining Teacher Support in Upper Secondary School Physical Education
Laxdal, Aron Gauti; Johannsson, Erlingur; Giske, Rune (Peer reviewed; Journal article, 2020)Physical education remains one of the most liked school subjects, irrespective of grade level or geography. Nevertheless, sections of the student body dislike the subject immensely and even more think it should be organized ... -
Screen Time and Body Image in Icelandic Adolescents: Sex-Specific Cross-Sectional and Longitudinal Associations
Hrafnkelsdottir, Soffia M; Brychta, Robert J; Rognvaldsdottir, Vaka; Chen, Kong Y.; Johannsson, Erlingur; Gudmundsdottir, Sigridur Lara; Arngrimsson, Sigurbjorn Arni (Peer reviewed; Journal article, 2022)Studies of adolescent body image and screen use are mostly limited to girls, and longitudinal data are scarce. We examined cross-sectional and longitudinal associations between these variables in mid-adolescent boys and ... -
Serum 25-hydroxyvitamin D concentrations in 16-year-old Icelandic adolescent and its association with bone mineral density
Guðmundsdóttir, Sigríður Lára; Hrafnkelsson, Hannes; Sigurðsson, Emil Lárus; Johannsson, Erlingur (Peer reviewed; Journal article, 2020)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 ... -
Tengsl D-vítamíns og áhættuþátta hjartaog æðasjúkdóma meðal íslenskra barna
Hannesdottir, Porunn; Hrafnkelsson, Hannes; Johannsson, Erlingur; Sigurosson, Emil L (Journal article; Peer reviewed, 2017)Tilgangur: Að kanna tengsl á milli D-vítamíngilda í blóði og þekktra áhættuþátta fyrir hjarta- og æðasjúkdómum meðal heilbrigðra íslenskra barna og jafnframt að kanna þessi tengsl óháð líkamsþyngdarstuðli (BMI). Efni ... -
Þrek, holdafar og heilsutengd lífsgæði eftir krabbameinsmeðferð
Gudmundsson, G. Haukur; Johannsson, Erlingur (Peer reviewed; Journal article, 2020)TILGANGUR Sífellt fleiri lifa lengi eftir meðferð vegna krabbameins. Þekking á langtímaáhrifum krabbameinsmeðferðar á þrek, holdafar og heilsutengd lífsgæði fólks, er mikilvæg fyrir þennan vaxandi samfélagshóp. Tilgangur ...