Personal information

Other IDs

Scopus Author ID: 57193572000
SciProfiles: 1458540

Activities

Collapse all

Employment (1)

University of Iceland: Reykjavik, IS

2011-09-01 to 2020-12-31 | Adjunct lecturer (Sport and Health Science)
Employment
Source: Self-asserted source
Vaka Rögnvaldsdóttir

Education and qualifications (1)

Háskóli Islands: Reykjavik, IS

2015-09-01 to 2020-05-26 | PhD (Faculty of Health Promotion, Sport and Leisure Studies)
Education
Source: Self-asserted source
Vaka Rögnvaldsdóttir

Works (18)

Sleep and physical activity characteristics in university students during the COVID-19 pandemic: A descriptive cross-sectional wrist actigraphy study

Sleep Epidemiology
2024-12 | Journal article
DOI: 10.1016/j.sleepe.2024.100087
Part of ISSN: 2667-3436
Contributors: Rúna Stefánsdóttir; Vaka Rognvaldsdottir; Alda O. Arnarsdottir; Thordis Gisladottir; Erlingur Johannsson; Sunna Gestsdottir; Greta Jakobsdottir
Source: Self-asserted source
Vaka Rögnvaldsdóttir

Longitudinal development and tracking of cardiorespiratory fitness from childhood to adolescence

PLOS ONE
2024-03-29 | Journal article
DOI: 10.1371/journal.pone.0299941
Contributors: Thuridur Helga Ingvarsdottir; Hans-Peter Kubis; Erlingur Johannsson; Vaka Rognvaldsdottir; Runa Sif Stefansdottir; Nanna Yr Arnardottir
Source: check_circle
Crossref

Changes in health-related lifestyle choices of university students before and during the COVID-19 pandemic: Associations between food choices, physical activity and health

PLOS ONE
2023-06-23 | Journal article
DOI: 10.1371/journal.pone.0286345
Contributors: Greta Jakobsdottir; Omar M. Khraisat; Runa Sif Stefansdottir; Sunna Gestsdottir; Vignir Stefansson; Erlingur Johannsson; Vaka Rognvaldsdottir; Thordis Lilja Gisladottir
Source: check_circle
Crossref

Screen Time and Body Image in Icelandic Adolescents: Sex-Specific Cross-Sectional and Longitudinal Associations

International Journal of Environmental Research and Public Health
2022-01-24 | Journal article
DOI: 10.3390/ijerph19031308
Contributors: Soffia M. Hrafnkelsdottir; Robert J. Brychta; Vaka Rognvaldsdottir; Kong Y. Chen; Erlingur Johannsson; Sigridur L. Guðmundsdottir; Sigurbjorn A. Arngrimsson
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Hreyfing íslenskra grunnskólanema

Netla – Veftímarit um uppeldi og menntun
2021-12-31 | Journal article
DOI: 10.24270/serritnetla.2021.8
Part of ISSN: ISSN 1670-0244
Source: Self-asserted source
Vaka Rögnvaldsdóttir
grade
Preferred source (of 2)‎

Svefnlengd íslenskra grunnskólanema

Netla – Veftímarit um uppeldi og menntun
2021-12-31 | Journal article
DOI: 10.24270/serritnetla.2021.7
Part of ISSN: ISSN 1670-0244
Source: Self-asserted source
Vaka Rögnvaldsdóttir
grade
Preferred source (of 2)‎

Health and well-being of university students before and during COVID-19 pandemic: A gender comparison

PLOS ONE
2021-12-14 | Journal article
DOI: 10.1371/journal.pone.0261346
Contributors: Sunna Gestsdottir; Stephan Doering; Thordis Gisladottir; Runa Stefansdottir; Erlingur Johannsson; Greta Jakobsdottir; Vaka Rognvaldsdottir
Source: check_circle
Crossref

Sleep timing and consistency are associated with the standardised test performance of Icelandic adolescents

Journal of Sleep Research
2021-06-14 | Journal article
DOI: 10.1111/jsr.13422
Part of ISSN: 0962-1105
Part of ISSN: 1365-2869
Source: Self-asserted source
Vaka Rögnvaldsdóttir

Organized Sport Participation, Physical Activity, Sleep and Screen Time in 16-Year-Old Adolescents

International Journal of Environmental Research and Public Health
2021-03-18 | Journal article
DOI: 10.3390/ijerph18063162
Contributors: Elvar S. Saevarsson; Vaka Rognvaldsdottir; Runa Stefansdottir; Erlingur Johannsson
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Changes in sleep and activity from age 15 to 17 in students with traditional and college-style school schedules

Sleep Health
2020-12 | Journal article
DOI: 10.1016/j.sleh.2020.04.009
Contributors: Runa Stefansdottir; Vaka Rognvaldsdottir; Sunna Gestsdottir; Sigridur L. Gudmundsdottir; Kong Y. Chen; Robert J. Brychta; Erlingur Johannsson
Source: check_circle
Crossref

Less screen time and more physical activity is associated with more stable sleep patterns among Icelandic adolescents

Sleep Health
2020-10 | Journal article
DOI: 10.1016/j.sleh.2020.02.005
Contributors: Soffia M. Hrafnkelsdottir; Robert J. Brychta; Vaka Rognvaldsdottir; Kong Y. Chen; Erlingur Johannsson; Sigridur L. Gudmundsdottir; Sigurbjorn A. Arngrimsson
Source: check_circle
Crossref

0337 Association Between Free-living Sleep and Memory and Attention in Healthy Adolescents

Sleep
2020-05 | Journal article
DOI: 10.1093/sleep/zsaa056.334
Part of ISSN: 0161-8105
Contributors: R Stefansdottir; H S Gundersen; H Haraldsson; V Rognvaldsdottir; A S Lundervold; S Gestsdottir; S L Gudmundsdottir; K Y Chen; R J Brychta; E Johannsson
Source: Self-asserted source
Vaka Rögnvaldsdóttir via Crossref Metadata Search

0260 Association Between Free-Living Physical Activity and Sleep in Icelandic Adolescents

Sleep
2020-05-27 | Conference abstract
Part of ISSN: 0161-8105
Source: Self-asserted source
Vaka Rögnvaldsdóttir

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

2020-01-31 | Preprint
DOI: 10.1101/2020.01.31.928333
Contributors: Vaka Rognvaldsdottir; Robert J. Brychta; Soffia M. Hrafnkelsdottir; Kong Y. Chen; Sigurbjorn A. Arngrimsson; Erlingur Johannsson; Sigridur L. Guðmundsdottir
Source: check_circle
Crossref
grade
Preferred source (of 3)‎

Longitudinal Change in Adolescent Bedtimes Measured by Self-Report and Actigraphy.

Journal for the measurement of physical behaviour
2019-12-01 | Journal article
DOI: 10.1123/jmpb.2019-0021
PMID: 31799503
PMC: PMC6889825
Source: Self-asserted source
Vaka Rögnvaldsdóttir

Less screen time and more frequent vigorous physical activity is associated with lower risk of reporting negative mental health symptoms among Icelandic adolescents

PLoS ONE
2018 | Journal article
DOI: 10.1371/journal.pone.0196286
EID:

2-s2.0-85046007936
Contributors: Hrafnkelsdottir, S.M.; Brychta, R.J.; Rognvaldsdottir, V.; Gestsdottir, S.; Chen, K.Y.; Johannsson, E.; Guðmundsdottir, S.L.; Arngrimsson, S.A.
Source: Self-asserted source
Vaka Rögnvaldsdóttir via Scopus - Elsevier

Physical activity and sleep in Icelandic adolescents,Hreyfing og svefn reykvískra ungmenna

Laeknabladid
2018 | Journal article
DOI: 10.17992/lbl.2018.02.173
EID:

2-s2.0-85041568254
Contributors: Rögnvaldsdóttir, V.; Valdimarsdóttir, B.M.; Brychta, R.J.; Hrafnkelsdóttir, S.M.; Arngrímsson, S.Á.; Jóhannsson, E.; Chen, K.Y.; Guomundsdóttir, S.L.
Source: Self-asserted source
Vaka Rögnvaldsdóttir via Scopus - Elsevier

Sleep deficiency on school days in Icelandic youth, as assessed by wrist accelerometry

Sleep Medicine
2017 | Journal article
DOI: 10.1016/j.sleep.2016.12.028
EID:

2-s2.0-85015064974
Contributors: Rognvaldsdottir, V.; Gudmundsdottir, S.L.; Brychta, R.J.; Hrafnkelsdottir, S.M.; Gestsdottir, S.; Arngrimsson, S.A.; Chen, K.Y.; Johannsson, E.
Source: Self-asserted source
Vaka Rögnvaldsdóttir via Scopus - Elsevier
How many people are using ORCID?