ub.xmlui.mirage2.page-structure.muninLogoub.xmlui.mirage2.page-structure.openResearchArchiveLogo
    • EnglishEnglish
    • norsknorsk
  • Velg spraakEnglish 
    • EnglishEnglish
    • norsknorsk
  • Administration/UB
View Item 
  •   Home
  • Det helsevitenskapelige fakultet
  • Institutt for helse- og omsorgsfag
  • Artikler, rapporter og annet (helse- og omsorgsfag)
  • View Item
  •   Home
  • Det helsevitenskapelige fakultet
  • Institutt for helse- og omsorgsfag
  • Artikler, rapporter og annet (helse- og omsorgsfag)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study

Permanent link
https://hdl.handle.net/10037/8557
DOI
https://doi.org/10.1136/bmjopen-2014-006665
Thumbnail
View/Open
article.pdf (846.4Kb)
(PDF)
Date
2015-03-20
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Winther, Anne; Ahmed, Luai Awad; Furberg, Anne-Sofie; Grimnes, Guri; Jorde, Rolf; Nilsen, Ole-Andreas; Dennison, Elaine; Emaus, Nina
Abstract

Objectives: Low levels of physical activity may have considerable negative effects on bone health in adolescence, and increasing screen time in place of sporting activity during growth is worrying. This study explored the associations between self-reported screen time at weekends and bone mineral density (BMD).

Design: In 2010/2011, 1038 (93%) of the region’s first-year upper-secondary school students (15– 18 years) attended the Tromsø Study, Fit Futures 1 (FF1). A follow-up survey (FF2) took place in 2012/ 2013. BMD at total hip, femoral neck and total body was measured as g/cm² by dual X-ray absorptiometry (GE Lunar prodigy). Lifestyle variables were selfreported, including questions on hours per day spent in front of television/computer during weekends and hours spent on leisure time physical activities. Complete data sets for 388/312 girls and 359/231 boys at FF1/FF2, respectively, were used in analyses. Sex stratified multiple regression analyses were performed.

Results: Many adolescents balanced 2–4 h screen time with moderate or high physical activity levels. Screen time was positively related to body mass index (BMI) in boys ( p=0.002), who spent more time in front of the computer than girls did ( p<0.001). In boys, screen time was adversely associated with BMDFF1 at all sites, and these associations remained robust to adjustments for age, puberty, height, BMI, physical activity, vitamin D levels, smoking, alcohol, calcium and carbonated drink consumption ( p<0.05). Screen time was also negatively associated with total hip BMDFF2 ( p=0.031). In contrast, girls who spent 4–6 h in front of the computer had higher BMD than the reference (<2 h).

Conclusions: In Norwegian boys, time spent on screen-based sedentary activity was negatively associated with BMD levels; this relationship persisted 2 years later. Such negative associations were not present among girls. Whether this surprising result is explained by biological differences remains unclear.

Publisher
BMJ Publishing Group: Open Access
Citation
BMJ Open 2015, 5
Metadata
Show full item record
Collections
  • Artikler, rapporter og annet (helse- og omsorgsfag) [842]

Browse

Browse all of MuninCommunities & CollectionsAuthor listTitlesBy Issue DateBrowse this CollectionAuthor listTitlesBy Issue Date
Login

Statistics

View Usage Statistics
UiT

Munin is powered by DSpace

UiT The Arctic University of Norway
The University Library
uit.no/ub - munin@ub.uit.no

Accessibility statement (Norwegian only)