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dc.contributor.authorChristoffersen, Tore
dc.contributor.authorWinther, Anne
dc.contributor.authorNilsen, Ole-Andreas
dc.contributor.authorAhmed, Luai Awad
dc.contributor.authorFurberg, Anne-Sofie
dc.contributor.authorGrimnes, Guri
dc.contributor.authorDennison, Elaine
dc.contributor.authorEmaus, Nina
dc.date.accessioned2016-02-12T10:53:03Z
dc.date.available2016-02-12T10:53:03Z
dc.date.issued2015-11-10
dc.description.abstractBackground: Optimization of the genetic potential for bone accrual in early life may prevent future fractures. Possible modification factors include lifestyle factors such as nutrition and physical activity. Measured levels of bone mineral density (BMD) and bone mass content (BMC) are indicators of bone strength, and are correlated with fracture risk. This study explored the impact of self-reported physical activity frequencies and intensity on BMD and BMC in Norwegian adolescents. <p>Methods: In 2010–2011 school students in two North-Norwegian municipalities were invited to a health survey, the Fit Future study. 508 girls and 530 boys aged 15–18 years attended. BMD and BMC were measured by dual X-ray absorptiometry. Physical activity and other lifestyle-factors were reported by questionnaires and clinical interviews. Statistical analyses were performed sex stratified, using ANOVA for comparison of means and linear regression models adjusting for factors known to affect bone. <p>Results: Approximately 2/3 of girls and boys reported themselves as physically active outside school hours. Active participants had a significantly higher BMD and BMC at all sites (p < 0.001), except for BMC total body in girls, compared to inactive participants. In multiple linear regression analyses, increased physical activity measured as days a week, categorized into seldom, moderate and highly, was positively associated with BMD (g/cm2 ) at all sites in girls. Girls reporting themselves as highly active had BMD levels 0.093 g/cm2 , 0.090 g/cm2 and 0.046 g/cm2 higher (p < 0.001) than their more seldom active peers at femoral neck, total hip and total body respectively. Corresponding values for boys were 0.125 g/cm2 , 0.133 g/cm2 and 0.66 g/cm2 . BMC measures showed similar trends at femoral neck and total hip. <p>Conclusions: Increased level of physical activity is associated with higher BMD and BMC levels in adolescents. For both sexes high activity frequency seems to be essential, whilst boys reporting quite hard intensity has an additional impact. The differential effects of physical activity on bone strength in adolescence have clinical implications, especially in preventive strategies.en_US
dc.identifier.citationBMC sports science, medicine and rehabilitation 7(2015) nr. 26en_US
dc.identifier.cristinIDFRIDAID 1287950
dc.identifier.doi10.1186/s13102-015-0020-y
dc.identifier.issn2052-1847
dc.identifier.urihttps://hdl.handle.net/10037/8487
dc.identifier.urnURN:NBN:no-uit_munin_8044
dc.language.isoengen_US
dc.publisherBioMed Centralen_US
dc.rights.accessRightsopenAccess
dc.subjectPopulation-based studyen_US
dc.subjectPhysical activityen_US
dc.subjectAdolescentsen_US
dc.subjectBone mineral densityen_US
dc.subjectDXAen_US
dc.subjectVDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Fysikalsk medisin og rehabilitering: 764en_US
dc.subjectVDP::Medical disciplines: 700::Clinical medical disciplines: 750::Physical medicine and rehabilitation: 764en_US
dc.titleDoes the frequency and intensity of physical activity in adolescence have an impact on bone? The Tromsø Study, Fit Futuresen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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