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Physical activity and bone health in schoolchildren: The mediating role of fitness and body fat
- Source :
- Zaguán. Repositorio Digital de la Universidad de Zaragoza, instname, PLoS ONE, Vol 10, Iss 4, p e0123797 (2015), PLoS ONE
- Publication Year :
- 2015
-
Abstract
- Background: The relationship between physical activity (PA) and bone health is well known, although the role of percent body fat (%BF) and fitness as confounders or mediators in this relationship remains uncertain. Objective: To examine whether the association between PA and bone mineral content (BMC) is mediated by %BF and cardiorespiratory fitness (CRF). Methods: In this cross sectional study, BMC, total %BF (by DXA), vigorous PA (VPA), CRF, age and height were measured in 132 schoolchildren (62 boys, aged 8-11 years). ANCOVA was used to test differences in BMC by %BF, CRF and VPA, controlling for different sets of confounders. Simple mediation analyses and serial multiple mediation analyses were fitted to examine whether the relationship between PA and BMC is mediated by %BF and fitness. Results: Children with high %BF had higher total body BMC than their peers after controlling for all sets of confounders. Children with good CRF or VPA had significantly less total body BMC after controlling for age and sex but in children with good CRF this inverse relation disappeared after adjusting by %BF. %BF and CRF both act as a full mediator in the association between VPA and BMC, after inclusion of the potential confounders in the models. Conclusion: Fitness and %BF seem to have a mediator role on the relationship between physical activity and bone mass.
- Subjects :
- Male
medicine.medical_specialty
Bone density
Physical fitness
Physical activity
lcsh:Medicine
Adipose tissue
Motor Activity
Bone health
Bone Density
Internal medicine
medicine
Humans
Motor activity
Child
lcsh:Science
Multidisciplinary
business.industry
lcsh:R
Confounding
humanities
Endocrinology
Adipose Tissue
Physical Fitness
Female
lcsh:Q
business
Research Article
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Zaguán. Repositorio Digital de la Universidad de Zaragoza, instname, PLoS ONE, Vol 10, Iss 4, p e0123797 (2015), PLoS ONE
- Accession number :
- edsair.doi.dedup.....cd04e5836054daec21bb92e57b38e732