根据儿童和青少年久坐行为领域比较骨密度。
Comparison of bone mineral density according to domains of sedentary behavior in children and adolescents.
机构信息
School of Technology and Sciences, Presidente Prudente, São Paulo State University (Unesp), Roberto Simonsen street, number 305, Presidente Prudente, Sao Paulo, 19.060-900, Brazil.
School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Australia.
出版信息
BMC Pediatr. 2022 Feb 1;22(1):72. doi: 10.1186/s12887-022-03135-2.
BACKGROUND
Somatic maturation and the age at onset of puberty are closely related to bone mineral density (BMD), and are potential confounders of the associations between physical activity, sedentary behavior (SB) and BMD in adolescents. Thus the aim was compare BMD at different anatomical sites according to different domains of SB.
METHODS
The sample consisted of 88 young people (54 boys and 34 girls; 9.5 ± 1.5 years). The self-reported SB was measured by the time spent on TV, computer, video game and smartphone. BMD at each location and throughout the body was assessed by DEXA. Physical activity was assessed by a questionnaire. The comparison of the different types of BMD sites according to the SB levels for each screen device and the total SB were analyzed by Covariance Analysis (ANCOVA).
RESULTS
Whole-body BMD was higher in young people with low total SB (Total BMD = 0.957 ± 0.042) than in those with moderate (Total BMD = 0.921 ± 0.053) and high SB (Total BMD = 0.929 ± 0.051) (p-value = 0.011). Children and adolescents with low total SB had higher BMD legs (0.965 ± 0.056) than young people with high total SB (BMD legs = 0.877 ± 0.209), but this relationship was attenuated when the analyzes were adjusted for physical activity (p-value = 0.068).
CONCLUSION
Adolescents with high sedentary behavior tend to have lower whole body bone mineral density than those with low sedentary behavior.
背景
体成熟度和青春期开始年龄与骨密度（BMD）密切相关，是体育活动与青少年 BMD 之间关联的潜在混杂因素。因此，本研究旨在根据不同的 SB 领域比较不同解剖部位的 BMD。
方法
本研究的样本由 88 名年轻人（54 名男孩和 34 名女孩；9.5±1.5 岁）组成。通过花费在电视、电脑、视频游戏和智能手机上的时间来测量自我报告的 SB。使用 DEXA 评估每个部位和全身的 BMD。通过问卷评估体育活动。使用协方差分析（ANCOVA）分析根据每个屏幕设备和总 SB 的 SB 水平比较不同类型的 BMD 部位。
结果
总 SB 较低的年轻人（总 BMD=0.957±0.042）的全身 BMD 高于总 SB 中度（总 BMD=0.921±0.053）和高（总 BMD=0.929±0.051）的年轻人（p 值=0.011）。总 SB 较低的儿童和青少年的腿部 BMD 较高（0.965±0.056），高于总 SB 较高的年轻人（腿部 BMD=0.877±0.209），但当调整体育活动时，这种关系减弱（p 值=0.068）。
结论
高静坐行为的青少年全身骨矿物质密度往往低于低静坐行为的青少年。
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