Energy expenditure in preadolescent African American and white boys and girls: the Baton Rouge Children's Study
Energy expenditure in preadolescent African American and white boys and girls: the Baton Rouge Children's Study
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DOI：
10.1093/ajcn/75.4.705
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发表时间：
2002-04-01
影响因子：
7.1
通讯作者：
Volaufova, J
中科院分区：
文献类型：
--
作者：
DeLany, JP;Bray, GA;Volaufova, J
工作背景：低能量消耗已被确定为一个潜在的危险因素体fat gains.Objective：其目的是确定种族，性别，体脂肪和能量expenditure.Design之间的关系：作为巴吞鲁日儿童研究的一部分，能量消耗进行了检查，在131青春期前的非洲裔美国人和白色女孩和男孩，进一步分层为肥胖或瘦。每日总能量消耗（TDEE）采用双标记水法测定。用间接量热法测定大鼠的静息代谢率和食物的热效应。采用双能X线吸收法测量去脂质量和脂肪质量。要考虑到身体大小的差异，能量消耗变量进行了调整，使用无脂肪质量或无脂肪质量和脂肪质量作为covariates.Results：非裔美国儿童有较低的TDEE和RMR比白色儿童。非裔美国女孩在体力活动中消耗的能量水平较低，非裔美国男孩的RMR较低，这是TDEE种族差异的原因。白色男孩的RMR高于白色女孩。女孩有一个较低的TDEE和消耗更少的能量在活动中比男孩。结论：非裔美国儿童比白色儿童消耗更少的能量。肥胖儿童从事活动的时间较少或从事低强度活动。肥胖儿童可能会通过减少体力活动时间来维持其肥胖状态，但他们不会降低RMR或食物的热效应。
Background: Low energy expenditure has been identified as a potential risk factor for body fat gain.Objective: The objective was to determine the relations between race, sex, body fat, and energy expenditure.Design: As part of the Baton Rouge Children's Study, energy expenditure was examined in 131 preadolescent African American and white girls and boys, further stratified as obese or lean. Total daily energy expenditure (TDEE) was measured by the doubly labeled water method. Resting metabolic rate (RMR) and the thermic effect of food were measured by indirect calorimetry. Fat-free mass and fat mass were measured by dual-energy X-ray absorptiometry. To account for differences in body size, energy expenditure variables were adjusted with the use of fat-free mass or fat-free mass and fat mass as covariates.Results: The African American children had lower TDEE and RMR than did the white children. A lower level of energy expended in physical activity by the African American girls and a lower RMR in the African American boys accounted for the racial differences in TDEE. The white boys had a higher RMR than did the white girls. The girls had a lower TDEE and expended less energy in activity than did the boys. Energy expended in activity was lower in the obese children.Conclusions: The African American children expended less energy than did the white children. The obese children spent less time engaged in activity or engaged in lower-intensity activity. Obese children may maintain their obese state by spending less time in physical activity, but they do not have a reduced RMR or thermic effect of food.