ArticleBMC sports science, medicine & rehabilitation2015
Does the frequency and intensity of physical activity in adolescence have an impact on bone? The Tromsø Study, Fit Futures.
Article in BMC sports science, medicine & rehabilitation, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
11 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Association between child and youth physical activity and family functioning: a systematic review of observational studies.The international journal of behavioral nutrition and physical activity · 2025Pooled it
- The Influence of Structured Multisport Activities at Different Weekly Frequencies on the Gross Motor Development of Preschool Children: Evidence for a Dose-Response Relationship.Journal of sports science & medicine · 2026Article
- Cross-sectional associations between accelerometer-measured physical activity and hip bone mineral density: the Tromsø Study 2015-2016.JBMR plus · 2024Article
- Criterion validity of the Saltin-Grimby Physical Activity Level Scale in adolescents. The Fit Futures Study.PloS one · 2022Article
- Family, school and individual characteristics associated with adolescents' physical activity at school in Hong Kong: the iHealt(H) study.The international journal of behavioral nutrition and physical activity · 2021Article
- Prevalence of accelerometer-measured physical activity in adolescents in Fit Futures - part of the Tromsø Study.BMC public health · 2020Article
- Article
- Change in physical activity is not associated with change in mental distress among adolescents: the Tromsø study: Fit Futures.BMC public health · 2019Article
- Vigorous physical activity patterns affect bone growth during early puberty in boys.Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2018Article
- A wearable activity tracker intervention for promoting physical activity in adolescents with juvenile idiopathic arthritis: a pilot study.Pediatric rheumatology online journal · 2018Article
- The association between childhood fractures and adolescence bone outcomes: a population-based study, the Tromsø Study, Fit Futures.Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2018Article
Corrections and comments
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Authors and funding
8 authors.
Funding
Abstract
backgroundOptimization 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.
methodsIn 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.
resultsApproximately 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/cm(2)) at all sites in girls. Girls reporting themselves as highly active had BMD levels 0.093 g/cm(2), 0.090 g/cm(2) and 0.046 g/cm(2) 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/cm(2), 0.133 g/cm(2) and 0.66 g/cm(2). BMC measures showed similar trends at femoral neck and total hip.
conclusionsIncreased 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.
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