The Effect of Mechanical Loading on the Size and Shape of Bone in Pre‐, Peri‐, and Postpubertal Girls: A Study in Tennis Players* (original) (raw)
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School of Health Sciences, Deakin University, Melbourne, Australia
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School of Health Sciences, Deakin University, Melbourne, Australia
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School of Health Sciences, Deakin University, Melbourne, Australia
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Biomechanics and Biomaterials Research Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Biomechanics and Biomaterials Research Center, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Department of Medicine, University of Melbourne, Melbourne, Australia
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Department of Nuclear Medicine, Alfred Hospital, Melbourne, Australia
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Revision received:
28 June 2002
Published:
02 December 2009
Cite
S. L. Bass, L. Saxon, R. M. Daly, C. H. Turner, A. G. Robling, E. Seeman, S. Stuckey, The Effect of Mechanical Loading on the Size and Shape of Bone in Pre‐, Peri‐, and Postpubertal Girls: A Study in Tennis Players, Journal of Bone and Mineral Research, Volume 17, Issue 12, 1 December 2002, Pages 2274–2280, https://doi.org/10.1359/jbmr.2002.17.12.2274
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Abstract
Exercise during growth results in biologically important increases in bone mineral content (BMC). The aim of this study was to determine whether the effects of loading were site specific and depended on the maturational stage of the region. BMC and humeral dimensions were determined using DXA and magnetic resonance imaging (MRI) of the loaded and nonloaded arms in 47 competitive female tennis players aged 8–17 years. Periosteal (external) cross‐sectional area (CSA), cortical area, medullary area, and the polar second moments of area (I P, mm4) were calculated at the mid and distal sites in the loaded and nonloaded arms. BMC and I P of the humerus were 11–14% greater in the loaded arm than in the nonloaded arm in prepubertal players and did not increase further in peri‐ or postpubertal players despite longer duration of loading (both, p < 0.01). The higher BMC was the result of a 7–11% greater cortical area in the prepubertal players due to greater periosteal than medullary expansion at the midhumerus and a greater periosteal expansion alone at the distal humerus. Loading late in puberty resulted in medullary contraction. Growth and the effects of loading are region and surface specific, with periosteal apposition before puberty accounting for the increase in the bone's resistance to torsion and endocortical contraction contributing late in puberty conferring little increase in resistance to torsion. Increasing the bone's resistance to torsion is achieved by modifying bone shape and mass, not necessarily bone density.
Copyright © 2002 ASBMR
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