Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway.
Obes Facts. 2012;5(4):515-26. doi: 10.1159/000341744. Epub 2012 Jul 23.
The aim of the current study was to examine to what extent changes in reported energy intake and physical activity predict changes in body fat during a family-based outpatient treatment of obesity in children.
Total body fat (DXA), reported energy intake (4-day diet record), and physical activity (accelerometer) was measured in 99 children (age 7-12 years, mean BMI SDS = 2.99) at baseline as well as after 6 months 2 years of treatment. Repeated measures (GLM), growth modeling, and structural equation modeling (SEM) were applied in the data analyses.
There was significant decrease in body fat, reported energy intake, and physical activity at both follow-ups (p < 0.001) compared to baseline. Changes in reported energy intake from baseline to 6 months predicted a decrease in body fat from baseline to 6 months (β = 0.68, p < 0.001). In addition, changes in reported energy intake had a strong indirect effect on body fat at 2-year follow-up, mediated by changes in body fat from baseline to 6 months (indirect β = 0.50, p < 0.001). Changes in physical activity did not predict changes in body fat during treatment.
Changes in reported energy intake significantly affected body fat at 6 months and indirectly predicted the amount of body fat at 2-year follow-up. The indirect effect was mediated by a decrease in body fat obtained during the first phase of treatment.
本研究旨在探讨在儿童家庭为基础的肥胖门诊治疗中，报告的能量摄入和身体活动的变化在多大程度上预测体脂肪的变化。
共纳入 99 名年龄在 7-12 岁（平均 BMI SDS=2.99）的儿童，在基线以及治疗 6 个月和 2 年后分别测量其总体脂肪（DXA）、报告的能量摄入（4 天饮食记录）和身体活动（加速度计）。采用重复测量（GLM）、生长模型和结构方程模型（SEM）进行数据分析。
与基线相比，在两次随访时均观察到体脂肪、报告的能量摄入和身体活动显著下降（p<0.001）。从基线到 6 个月的报告能量摄入变化预测了从基线到 6 个月的体脂肪变化（β=0.68，p<0.001）。此外，报告能量摄入的变化对 2 年随访时的体脂肪有很强的间接影响，由基线到 6 个月的体脂肪变化介导（间接β=0.50，p<0.001）。身体活动的变化不能预测治疗期间体脂肪的变化。
报告的能量摄入的变化在 6 个月时显著影响体脂肪，并且间接地预测了 2 年随访时的体脂肪量。间接效应是通过治疗的第一阶段体脂肪的减少来介导的。
