School of Sport Science/Key Laboratory of the Ministry of Education of Exercise and Physical Fitness, Beijing Sport University, Beijing 100084, China.
Biomed Res Int. 2021 Nov 1;2021:1904343. doi: 10.1155/2021/1904343. eCollection 2021.
The purpose of this study was to investigate the relationship between body compositions and bone mineral density (BMD) and the effect of composition substitution among Chinese children and adolescents without the influence of multicollinearity. A dual-energy X-ray absorptiometry scan was used to determine the amount of truncal fat (TF), nontruncal fat (NTF), fat-free mass (FFM), and BMD. The compositional data analysis and the compositional proportional substitution analysis were conducted to determine the effect of each part of body compositions on BMD and its substitution effects. Four hundred sixty-six (466) (boys: 51.9%) participants completed this cross-sectional study. For girls, in the overweight group, the relationship between TF and the BMD was positive ( = 2.943 - 01, = 0.006) while the NTF showed the opposite trend ( = -2.358 - 01, = 0.009). When 4% NTF or FFM was substituted by TF, the BMD increased by about 0.1 and 0.05 units ( < 0.05), respectively. For boys, the association between FFM and BMD was statistically positive ( = 4.091 - 02, = 0.0001). There was a positive correlation between TF and BMD ( = 7.963 - 02, = 0.036). But with the increase of BMI, this correlation shifted in the opposite direction. In conclusion, compared to TF and NTF, FFM had a better protective effect on BMD, especially for boys. The risk of NTF accumulation on BMD was greater than that of TF accumulation. Compared with girls, boys were more sensitive to the amount of TF.
本研究旨在探讨中国儿童和青少年体成分与骨密度（BMD）之间的关系，以及在没有多重共线性影响的情况下，体成分之间的替代效应。使用双能 X 射线吸收仪扫描来确定躯干脂肪（TF）、非躯干脂肪（NTF）、去脂体重（FFM）和 BMD 的量。进行成分数据分析和成分比例替代分析，以确定体成分的各个部分对 BMD 的影响及其替代效应。共有 466 名（466）（男生：51.9%）参与者完成了这项横断面研究。对于女生，在超重组中，TF 与 BMD 之间呈正相关（ = 2.943 - 01， = 0.006），而 NTF 则呈相反趋势（ = -2.358 - 01， = 0.009）。当 4%的 NTF 或 FFM 被 TF 替代时，BMD 分别增加了约 0.1 和 0.05 个单位（<0.05）。对于男生，FFM 与 BMD 之间存在统计学上的正相关（ = 4.091 - 02， = 0.0001）。TF 与 BMD 之间呈正相关（ = 7.963 - 02， = 0.036）。但随着 BMI 的增加，这种相关性发生了相反的变化。总之，与 TF 和 NTF 相比，FFM 对 BMD 有更好的保护作用，尤其是对男生。NTF 对 BMD 的累积风险大于 TF 累积风险。与女生相比，男生对 TF 的量更敏感。
