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dc.contributor.authorMeiring, R.
dc.contributor.authorMcVeigh, Joanne
dc.date.accessioned2017-01-30T12:49:37Z
dc.date.available2017-01-30T12:49:37Z
dc.date.created2016-11-13T19:30:49Z
dc.date.issued2014
dc.identifier.citationMeiring, R. and McVeigh, J. 2014. Associations of objectively and subjectively measured physical activity with trabecular and cortical bone properties in prepubertal children. South African Journal of Sports Medicine. 26 (2): pp. 48-54.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/25668
dc.description.abstract

Objectives. To compare the relationship between peak bone strain scores (PBSSs) calculated from physical activity (PA) questionnaires and accelerometry measures of PA with trabecular and cortical bone properties in prepubertal children. Methods. We compared PBSSs calculated from the bone-specific component of PA questionnaires with accelerometry and bone mass measures in 38 prepubertal children (mean 9.9 (standard deviation 1.3) years). Dual energy X-ray absorptiometry (DXA) and peripheral quantitative computed tomography (pQCT) were used to assess bone content and structure, and to estimate bone strength at the radial and tibial diaphysis and radial metaphysis. Results. The PBSS was reliable and reproducible with significant (p<0.001) intraclass correlation coefficients. There were significant correlations between PBSS and moderate (r=0.38; p=0.02), vigorous (r=0.36; p=0.03) and combined moderate- to vigorous-intensity activity counts (r=0.38; p=0.02). PBSS was significantly correlated to body size-adjusted bone mineral content at all sites scanned by DXA (r=0.33 - 0.48; p<0.05). Positive correlations were observed between PBSS and area, density and strength at the radius and tibia (r=0.40 - 0.64; p<0.05). Only vigorous activity was correlated to cortical area at the radial diaphysis (r=0.37; p=0.03) and bone strength at the tibial diaphysis (r=0.32; p=0.05). Activity as assessed by the PBSS explained a greater amount of variance in bone variables as measured by DXA and pQCT than accelerometer-measured PA. Conclusion. Accelerometer-measured moderate and vigorous habitual PA is associated with indices of cortical bone size and geometry in children, whereas light PA has no detectable association. Furthermore, the bone-specific questionnaire appears to be more strongly associated with bone outcomes than accelerometer-derived measures of PA.

dc.relation.urihttp://journals.assaf.org.za/sajsm/article/view/396
dc.titleAssociations of objectively and subjectively measured physical activity with trabecular and cortical bone properties in prepubertal children
dc.typeJournal Article
dcterms.source.volume26
dcterms.source.number2
dcterms.source.startPage48
dcterms.source.endPage54
dcterms.source.issn2078-516X
dcterms.source.titleSouth African Journal of sports medicine
curtin.note

This open access article is distributed under the Creative Commons license https://creativecommons.org/licenses/by/4.0/

curtin.departmentSchool of Occupational Therapy and Social Work
curtin.accessStatusOpen access


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