Diniz Tiego Aparecido, Agostinete Ricardo Ribeiro, Costa Paulo, Saraiva Bruna Thamyres Ciccotti, Sonvenso Diego Kanashiro, Freitas Ismael Forte, Fernandes Rômulo Araujo, Christofaro Diego Giulliano Destro
Doctoral Student, Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, São Paulo (SP), Brazil.
Master's Student, Department of Physiotherapy, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Presidente Prudente (SP), Brazil.
Sao Paulo Med J. 2017 Sep-Oct;135(5):444-449. doi: 10.1590/1516-3180.2017.0042070417. Epub 2017 Aug 21.
This study aimed to investigate the relationship between total and segmental bone mineral density (BDM) and physical activity (PA) in different domains (school, leisure and sports) among adolescents and children.
Cross-sectional study in the Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP).
The study sample consisted of 173 children and adolescents (10.31 ± 1.87 years). The BMDs for the whole body (WB) and the regions of the trunk and legs were measured using dual energy X-ray absorptiometry (DXA). PA was measured using the Baecke questionnaire. A regression model was used to analyze the relationship between all the BMDs and the different domains of PA.
41.5% of the adolescents had high percentages of body fat. Regarding the comparison between physically active and insufficiently active adolescents, there were no statistically significant differences in any BMD variables (P > 0.05). The BMD of the legs showed positive relationships with the total PA (β = 0.009; P = 0.013) and sports PA (β = 0.010; P = 0.049) after insertion of the confounders. Similarly, the WB BMD showed the same relationships (total PA: β = 0.005; P = 0.045; and sports PA: β = 0.008; P = 0.049). No relationship was found between leisure and school PA and any of the BMDs (P > 0.05).
The results indicated that practice of sport was related to higher BMD values, independent of sex, age and body fatness.
本研究旨在调查青少年和儿童全身及分段骨矿物质密度（BMD）与不同领域（学校、休闲和体育）身体活动（PA）之间的关系。
在圣保罗州立大学胡利奥·德梅斯基塔·菲洛分校（UNESP）进行的横断面研究。
研究样本包括173名儿童和青少年（10.31±1.87岁）。使用双能X线吸收法（DXA）测量全身（WB）以及躯干和腿部区域的骨密度。使用贝克问卷测量身体活动。采用回归模型分析所有骨密度与身体活动不同领域之间的关系。
41.5%的青少年体脂百分比偏高。在比较身体活动活跃和不活跃的青少年时，任何骨密度变量均无统计学显著差异（P>0.05）。在纳入混杂因素后，腿部骨密度与总身体活动（β=0.009；P=0.013）和体育身体活动（β=0.010；P=0.049）呈正相关。同样，全身骨密度也呈现相同的关系（总身体活动：β=0.005；P=0.045；体育身体活动：β=0.008；P=0.049）。未发现休闲和学校身体活动与任何骨密度之间存在关系（P>0.05）。
结果表明，体育锻炼与较高的骨密度值相关，与性别、年龄和体脂无关。
