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Titolo:
Muscle cross-sectional area is associated with specific site of bone in prepubertal girls: A quantitative magnetic resonance imaging study
Autore:
Heinonen, A; McKay, HA; Whittall, KP; Forster, BB; Khan, KM;
Indirizzi:
Univ British Columbia, Sch Human Kinet, Vancouver, BC V6T 1Z1, Canada UnivBritish Columbia Vancouver BC Canada V6T 1Z1 ver, BC V6T 1Z1, Canada Univ British Columbia, Dept Radiol, Vancouver, BC, Canada Univ British Columbia Vancouver BC Canada Radiol, Vancouver, BC, Canada Univ British Columbia, Dept Family Practice, Vancouver, BC V5Z 1M9, CanadaUniv British Columbia Vancouver BC Canada V5Z 1M9 ver, BC V5Z 1M9, Canada
Titolo Testata:
BONE
fascicolo: 4, volume: 29, anno: 2001,
pagine: 388 - 392
SICI:
8756-3282(200110)29:4<388:MCAIAW>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHYSICAL-ACTIVITY; MINERAL DENSITY; EXERCISE INTERVENTION; SQUASH PLAYERS; MASS; STRENGTH; CHILDREN; DETERMINANTS; TENNIS; STRAIN;
Keywords:
magnetic resonance imaging (MRI); bone, muscle; cross-sectional area; mechanical loading; prepubertal girls;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Heinonen, A Univ British Columbia, Sch Human Kinet, Vancouver, BC V6T 1Z1,Canada Univ British Columbia Vancouver BC Canada V6T 1Z1 1Z1, Canada
Citazione:
A. Heinonen et al., "Muscle cross-sectional area is associated with specific site of bone in prepubertal girls: A quantitative magnetic resonance imaging study", BONE, 29(4), 2001, pp. 388-392

Abstract

It is well established that forces applied to bone are the result of muscle contraction. However, data regarding the contribution of muscle cross-sectional area (because muscle area is proportional to muscle strength) to cortical bone area before puberty are controversial. We tested the hypothesis that muscle cross-sectional area is associated with total cortical bone area, and whether there is a region-specific relationship between these parameters in prepubertal and early pubertal girls. Seventeen healthy (9-11 years, Tanner stages I-II) white girls participated in the study. We measured bone loading characteristics (maximal ground reaction forces; GRFs) for a drop jump (50 cm) and side-to-side jump (over a 20-cm-high fence) on a multicomponent force platform. Muscle cross-sectional area and bone cortical area (square centimeters) of the proximal third of the left and right lower leg was measured with a 1.5 T magnetic resonance system using a quadrature headcoil. The sequence was T, weighted, with spin-echo in transverse (tibial) planes and 3 mm sections with no gap (ten slices). The tibial cross-sectional areas were subdivided into three anatomical sectors (SI-SIII), with the tibial centroid as origin. SI extended from the medial tibial border to themost anterior edge, SII extended from the anterior edge laterally to the interosseous border, and SIII extended posteromedially from the interosseousborder to the medial tibial border. The nonparametric bone and muscle volume correlations demonstrated that the total muscle cross-sectional area correlated significantly with the total cortical area in both legs (left leg: r(s) = 0.59, p = 0.020;, right leg: r(s) = 0.57, p = 0.016). Significant correlations were also found between left and right muscle area and cortical area in SII (r(s) = 0.68, p = 0.003, 0.67, and 0.003, respectively). There was no significant association between the muscle area and cortical area inSI or SIII In addition, there was a significant correlation between GRFs of the side-to-side jump and total cortical area (left leg: r = 0.75, p < 0.01; right leg: r = 0.78, p < 0.01). Thus, we found that muscle area was most highly associated with bone cortical area in SII, the anterolateral sector of the tibia, which emphasizes the specific interplay of muscles and bonein the lower limb. This relationship was present in a regional, site-specific fashion. (Bone 29:388-392;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 00:31:55