Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study
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 de...
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ftunivtroemsoe:oai:munin.uit.no:10037/8557 2023-05-15T18:34:35+02:00 Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study Winther, Anne Ahmed, Luai Awad Furberg, Anne-Sofie Grimnes, Guri Jorde, Rolf Nilsen, Ole-Andreas Dennison, Elaine Emaus, Nina 2015-03-20 https://hdl.handle.net/10037/8557 https://doi.org/10.1136/bmjopen-2014-006665 eng eng BMJ Publishing Group: Open Access BMJ Open 2015, 5 FRIDAID 1247774 doi:10.1136/bmjopen-2014-006665 2044-6055 https://hdl.handle.net/10037/8557 URN:NBN:no-uit_munin_8135 openAccess VDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Fysikalsk medisin og rehabilitering: 764 VDP::Medical disciplines: 700::Clinical medical disciplines: 750::Physical medicine and rehabilitation: 764 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.1136/bmjopen-2014-006665 2021-06-25T17:54:37Z 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. Article in Journal/Newspaper Tromsø University of Tromsø: Munin Open Research Archive Tromsø BMJ Open 5 6 e006665 e006665 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
topic |
VDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Fysikalsk medisin og rehabilitering: 764 VDP::Medical disciplines: 700::Clinical medical disciplines: 750::Physical medicine and rehabilitation: 764 |
spellingShingle |
VDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Fysikalsk medisin og rehabilitering: 764 VDP::Medical disciplines: 700::Clinical medical disciplines: 750::Physical medicine and rehabilitation: 764 Winther, Anne Ahmed, Luai Awad Furberg, Anne-Sofie Grimnes, Guri Jorde, Rolf Nilsen, Ole-Andreas Dennison, Elaine Emaus, Nina Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study |
topic_facet |
VDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Fysikalsk medisin og rehabilitering: 764 VDP::Medical disciplines: 700::Clinical medical disciplines: 750::Physical medicine and rehabilitation: 764 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Winther, Anne Ahmed, Luai Awad Furberg, Anne-Sofie Grimnes, Guri Jorde, Rolf Nilsen, Ole-Andreas Dennison, Elaine Emaus, Nina |
author_facet |
Winther, Anne Ahmed, Luai Awad Furberg, Anne-Sofie Grimnes, Guri Jorde, Rolf Nilsen, Ole-Andreas Dennison, Elaine Emaus, Nina |
author_sort |
Winther, Anne |
title |
Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study |
title_short |
Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study |
title_full |
Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study |
title_fullStr |
Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study |
title_full_unstemmed |
Leisure time computer use and adolescent bone health - findings from the Tromsø Study, Fit Futures: a cross sectional study |
title_sort |
leisure time computer use and adolescent bone health - findings from the tromsø study, fit futures: a cross sectional study |
publisher |
BMJ Publishing Group: Open Access |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/8557 https://doi.org/10.1136/bmjopen-2014-006665 |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_relation |
BMJ Open 2015, 5 FRIDAID 1247774 doi:10.1136/bmjopen-2014-006665 2044-6055 https://hdl.handle.net/10037/8557 URN:NBN:no-uit_munin_8135 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1136/bmjopen-2014-006665 |
container_title |
BMJ Open |
container_volume |
5 |
container_issue |
6 |
container_start_page |
e006665 |
op_container_end_page |
e006665 |
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1766219381253079040 |