Faculty of Art and Social Sciences, Division of Physical Education, University of Balamand, El-Koura, Lebanon.
J Adolesc Health. 2010 Dec;47(6):591-5. doi: 10.1016/j.jadohealth.2010.04.018. Epub 2010 Jun 23.
The aim of this study was to compare the whole body (WB) bone mineral content (BMC) and bone mineral density (BMD) in obese, overweight, and normal-weighted adolescent sedentary girls.
This study included 17 obese, 27 overweight, and 21 normal-weighted adolescent (aged, 12-20) sedentary (practicing less than 2 hours of physical activity/week) girls. The three groups (obese, overweight, and normal) were matched for age and maturation index (years since menarche). BMC, bone mineral area (BMA), BMD, and body composition were assessed by dual-energy X-ray asborptiometry. Bone mineral apparent density (BMAD) was calculated for the WB.
Obese girls had higher BMC values than overweight and normal-weighted girls (p < .05 and p < .001, respectively). Overweight girls had higher BMC values than normal-weighted girls (p < .05). BMD values were not different among the three groups. However, obese and overweight girls had lower BMAD and higher BMC/height values in comparison with normal-weighted girls (p < .05). Finally, after adjustment for lean mass, BMC, BMA, BMD, and BMAD were not different among the three groups.
In this population, overweight and obesity are associated with higher BMC, BMC/height, and lower BMAD of the WB. This study suggests that BMD, BMC, BMA, and BMAD of the WB are not significantly different among the three groups (obese, overweight, and normal) after adjustment for lean mass. Therefore, our results suggest that the skeleton of the overweight and the obese girls adapts to the increased lean mass.
本研究旨在比较肥胖、超重和体重正常的青少年久坐女孩的全身（WB）骨矿物质含量（BMC）和骨矿物质密度（BMD）。
本研究纳入了 17 名肥胖、27 名超重和 21 名体重正常（每周运动时间少于 2 小时）的青少年久坐（至少）女孩。这三组（肥胖、超重和正常）在年龄和成熟指数（初潮后年数）方面相匹配。通过双能 X 射线吸收法评估 BMC、骨矿物质面积（BMA）、BMD 和身体成分。计算了 WB 的骨矿物质表观密度（BMAD）。
肥胖女孩的 BMC 值高于超重和体重正常的女孩（p<0.05 和 p<0.001）。超重女孩的 BMC 值高于体重正常的女孩（p<0.05）。三组之间的 BMD 值没有差异。然而，与体重正常的女孩相比，肥胖和超重女孩的 BMAD 较低，BMC/身高值较高（p<0.05）。最后，在调整瘦体重后，三组之间的 BMC、BMA、BMD 和 BMAD 没有差异。
在本研究人群中，超重和肥胖与 WB 的 BMC、BMC/身高较高和 BMAD 较低有关。本研究表明，在调整瘦体重后，WB 的 BMD、BMC、BMA 和 BMAD 在肥胖、超重和正常三组之间没有显著差异。因此，我们的结果表明，超重和肥胖女孩的骨骼适应了增加的瘦体重。
