Basal Energy Expenditure of Chinese Healthy Adults:Comparison of Measured and Predicted Values

Objective This study aimed to measure the basal energy expenditure(BEE)of Chinese healthy adults and establish an accurate predictive equation for this population.Methods In total,470 Chinese healthy adults had their BEE measured using the Cosmed K4b2 portable metabolic system.Multiple linear regression analysis was applied to develop new optimal equations for predicting BEE.The bias,accuracy rate,concordance correlation coefficient(CCC),and root mean square error(RMSE)were used to evaluate the accuracy of the predictive equations.Results There was a significant difference in BEE between males and females,with 5,954 kJ/d and 5,089 kJ/d,respectively.People living in rural areas expended significantly higher BEE(5,885 kJ/d)than those in urban areas(5,279 kJ/d).Previous equations developed by Henry,Schofield,Harris-Benedict(HB),and Liu overestimated the BEE of Chinese healthy adults.The new equations derived from the present study displayed the smallest average bias and RMSE from the measured basal energy expenditure(mBEE).The CCC of the new equations was higher than other predictive equations,but it was lower than 0.8.There was no significant difference in the accuracy rate among all predictive equations.Conclusions Sex and regional differences in BEE were observed in Chinese healthy adults.Neither the widely used previous predictive equations nor the one derived in the present study were accurate enough for estimating the BEE of Chinese healthy adults.Further study is required to develop more accurate equations for predicting the BEE of Chinese healthy adults aged between 20–45 years.

健康成人能量代谢的预测研究

研究我国健康成人基础能量消耗（BEE）的预测公式，并与Harris－Benedict（简称HB）公式及Owen公式比较。另外，对静息能量消耗（PEE）测试时间与食物特殊动力作用（SDA）大小及其持续时间的关系进行探讨。选择不同年龄、多个出生地、多种职业人群的健康志愿者165名（男86名，女79名），于早晨、空腹，平静仰卧或安坐30分钟后用CCM代谢车的标准法测量BEE。此外，103名志愿者（男43名，女60名），于禁食2小时以上不同时间测量REE。实测BEE平均值男1387±263kal／d、女1107±163kal／d，均显著低于HBEE和OBEE预测值（P＜001），并得出预测公式★BEE（男）＝696＋13.6W－6A；★BEE（女）＝714＋6.8W。禁食2小时以上不同时间REE测量结果示禁食2～4小时内测得的比较稳定。通过REE与SDA关系的分析，说明禁食2～4小时计算SDA较为合理，SDA男152％、女105％。本研究证实★BEE预测公式适合我国健康成人，临床补给营养时乘以疾病矫正系数即可。REE测量时间应限定在禁食2—4小时内，此期亦为SDA持续时间，SDA值男15．2％、女10．5％。如有代谢车设备，用REE值乘以1．2～1．5即可计算病人的能量需求。