Torres-Costoso Ana, Vlachopoulos Dimitris, Ubago-Guisado Esther, Ferri-Morales Asunción, Cavero-Redondo Iván, Martínez-Vizcaino Vicente, Gracia-Marco Luis
1 University of Castilla-La Mancha.
2 University of Exeter.
Pediatr Exerc Sci. 2018 Nov 1;30(4):466-473. doi: 10.1123/pes.2017-0217. Epub 2018 May 26.
The present study aims to investigate the association between dual-energy X-ray absorptiometry (DXA) and quantitative ultrasound (QUS) parameters and the intermethods agreement in active males.
In this cross-sectional study, bone health (by DXA and calcaneal QUS), physical activity (by accelerometers), and anthropometrics measurements were assessed in 117 active adolescents (12-14 y old). Bivariate correlation coefficients were calculated to assess the relationships between DXA standard regions of interest and QUS parameters. Intraclass correlation coefficients and Bland-Altman plots were used to assess the level of agreement between bone mineral content regions derived from DXA and stiffness index. The measurements were z score transformed for comparison.
Most QUS parameters were positive and significantly correlated with DXA outcomes (stiffness index: r = .43-.52; broadband ultrasound attenuation: r = .50-.58; speed of sound: r = .25-.27) with the hip showing the highest correlations. Moreover, the present study found fair to good intraclass correlation coefficients of agreement (.60-.68) between DXA and QUS to assess bone health. The Bland-Altman analysis showed a limited percentage of outliers (3.2%-8.6%).
QUS device could represent an acceptable alternative method to assess bone health in active adolescent males.
本研究旨在调查双能X线吸收法（DXA）和定量超声（QUS）参数之间的关联以及活跃男性中两种方法的一致性。
在这项横断面研究中，对117名活跃青少年（12 - 14岁）进行了骨健康评估（通过DXA和跟骨QUS）、身体活动评估（通过加速度计）以及人体测量。计算双变量相关系数以评估DXA标准感兴趣区域与QUS参数之间的关系。使用组内相关系数和Bland-Altman图来评估DXA得出的骨矿物质含量区域与硬度指数之间的一致性水平。对测量值进行z分数转换以进行比较。
大多数QUS参数为正值，且与DXA结果显著相关（硬度指数：r = 0.43 - 0.52；宽带超声衰减：r = 0.50 - 0.58；声速：r = 0.25 - 0.27），其中髋部的相关性最高。此外，本研究发现DXA和QUS之间评估骨健康的组内相关系数一致性为中等至良好（0.60 - 0.68）。Bland-Altman分析显示异常值的百分比有限（3.2% - 8.6%）。
QUS设备可作为评估活跃青少年男性骨健康的一种可接受的替代方法。
