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Titolo:
Mineral mass, size, and estimated mechanical strength of triple jumpers' lower limb
Autore:
Heinonen, A; Sievanen, H; Kyrolainen, H; Perttunen, J; Kannus, P;
Indirizzi:
UKK Inst Hlth Promot Res, Bone Res Grp, Tampere 33501, Finland UKK Inst Hlth Promot Res Tampere Finland 33501 p, Tampere 33501, Finland Univ Jyvaskyla, Dept Biol Phys Activ, Neuromuscular Res Ctr, SF-40100 Jyvaskyla, Finland Univ Jyvaskyla Jyvaskyla Finland SF-40100 r, SF-40100 Jyvaskyla, Finland Tampere Univ, Sch Med, Dept Surg, FIN-33101 Tampere, Finland Tampere UnivTampere Finland FIN-33101 Surg, FIN-33101 Tampere, Finland Univ Hosp, Tampere, Finland Univ Hosp Tampere FinlandUniv Hosp, Tampere, Finland
Titolo Testata:
BONE
fascicolo: 3, volume: 29, anno: 2001,
pagine: 279 - 285
SICI:
8756-3282(200109)29:3<279:MMSAEM>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY ABSORPTIOMETRY; QUANTITATIVE COMPUTED-TOMOGRAPHY; HUMAN LONG BONES; YOUNG-WOMEN; DIMENSIONS; EXERCISE; DENSITY; RADIUS; GROWTH;
Keywords:
extreme physical loading; bone size; bone strength; volumetric density; peripheral quantitative computed tomography (pQCT);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Heinonen, A UKK Inst Hlth Promot Res, Bone Res Grp, POB 30, Tampere 33501,Finland UKK Inst Hlth Promot Res POB 30 Tampere Finland 33501 Finland
Citazione:
A. Heinonen et al., "Mineral mass, size, and estimated mechanical strength of triple jumpers' lower limb", BONE, 29(3), 2001, pp. 279-285

Abstract

This study was designed to examine the anticipated strong influence of extreme impact loading on the mineral mass, size, and gross structural properties of triple jumpers' lower limb bones. We compared the bone data obtainedwith peripheral quantitative computed tomography (pQCT) and dual-energy X-ray absorptiometry (DXA) from 8 Finnish triple jumpers with corresponding data from gender-, age-, height-, and weight-matched nonathletic peers. The volumetric (trabecular) density was significantly higher in the jumpers than in controls (from an average 18% difference at the distal tibia to a 41% difference at the proximal tibia), whereas the cortical density did not differ between groups. The DXA-derived areal bone mineral density of the femoral neck and lumbar spine was 31% higher in the jumpers than in controls, compared with a 16% difference between groups at the less-loaded distal. radius. The lower limb bones were comparable in size between groups except at the distal femur where a significant 4%-6% difference was observed in favor of the triple jumpers. Mean tibial cortical wall thickness and area were substantially greater in the triple jumpers; the mean group difference rangedfrom about 20% at the shaft sites, to over 50% at the distal tibia. Given the apparently stronger cortices in the triple jumpers, the section moduli (bone strength index) of their femoral necks and tibiae were 19%-31% highercompared with the control group. Our findings indicate the ability of extreme impact loading to considerably improve bone's mechanical competence. Adaptation to loading seems to occur in a site-specific fashion by gross geometric changes, structural or architectural changes, or by their combination. The loading effect was best seen as enlarged bone cortices, probably after the trabecular density had reached its ceiling. (Bone 29:279-285; 2001) (C) 2001 by Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 13:31:07