Assessment of developmental changes of energy expenditure in young Japanese children and development of an accurate method for estimation of physical activity level

本研究的目的是利用双标记水（DLW）法和三轴加速度计评估能量消耗的发展变化。我们测量了2012年至2014年夏季和冬季21名3-6岁日本儿童的每日能量消耗。对我们在2012年夏季和冬季使用这两种方法获得的数据进行分析，结果表明，DLW方法测得的单位体重总能量消耗的平均值在79.0和84.0（千卡/千克/天）之间。比较2012年夏季和2013年夏季的数据显示，三个时期的综合三轴加速度的平均值：在幼儿园，在家里，和所有其他活动，包括交通，往往随着受试者的成长而下降。我们还测量了静息能量消耗使用罩的方法。每三个月进行一次的测量显示，平均每体重的静息能量消耗随着受试者年龄的增加而下降。

The aim of this research is to assess the developmental changes of energy expenditure using the doubly labeled water (DLW) method and triaxial accelerometry. We measured daily energy expenditure in twenty one Japanese children aged 3-6 in both summer and winter from 2012 through 2014. Analysis of the data which we obtained using both methods in the summer and winter of 2012, showed that the averages of total energy expenditure per weight measured by the DLW method were between 79.0 and 84.0(kcal/kg/day). Comparing the data between summer 2012 and 2013 revealed that the average of integrated triaxial acceleration during three periods: at kindergarten, at home, and all other activities including transit, tended to decrease as the subjects grew. We also measured resting energy expenditure using a hood method. Measurements taken every three months revealed that the average resting energy expenditure per weight decreased as the subjects' age increased.