Littlewood R A, White M S, Bell K L, Davies P S W, Cleghorn G J, Grote R
Department of Paediatrics and Child Health, University of Queensland, Australia.
Clin Nutr. 2002 Dec;21(6):491-7. doi: 10.1054/clnu.2002.0580.
The objective of the study was to compare data obtained from the Cosmed K4 b(2) and the Deltatrac II metabolic cart for the purpose of determining the validity of the Cosmed K4 b(2) in measuring resting energy expenditure.
Nine adult subjects (four male, five female) were measured. Resting energy expenditure was measured in consecutive sessions using the Cosmed K4 b(2), the Deltatrac II metabolic cart separately and the Cosmed K4 b(2) and Deltatrac II metabolic cart simultaneously, performed in random order. Resting energy expenditure (REE) data from both devices were then compared with values obtained from predictive equations.
Bland and Altman analysis revealed a mean bias for the four variables, REE, respiratory quotient (RQ), V CO(2), V O(2) between data obtained from Cosmed K4 b(2) and Deltatrac II metabolic cart of 268+/-702 kcal/day, -0.0+/-0.2, 26.4+/-118.2 and 51.6+/-126.5 ml/min, respectively. Corresponding limits of agreement for the same four variables were all large. Also, Bland and Altman analysis revealed a larger mean bias between predicted REE and measured REE using Cosmed K4 b(2) data (-194+/-603 kcal/day) than using Deltatrac metabolic cart data (73+/-197 kcal/day).
Variability between the two devices was very high and a degree of measurement error was detected. Data from the Cosmed K4 b(2) provided variable results on comparison with predicted values, thus, would seem an invalid device for measuring adults.
本研究的目的是比较从Cosmed K4 b(2)和Deltatrac II代谢监测仪获得的数据，以确定Cosmed K4 b(2)在测量静息能量消耗方面的有效性。
对9名成年受试者（4名男性，5名女性）进行测量。使用Cosmed K4 b(2)、Deltatrac II代谢监测仪分别连续测量静息能量消耗，并随机顺序同时使用Cosmed K4 b(2)和Deltatrac II代谢监测仪进行测量。然后将两种设备的静息能量消耗（REE）数据与通过预测方程获得的值进行比较。
Bland和Altman分析显示，从Cosmed K4 b(2)和Deltatrac II代谢监测仪获得的数据之间，四个变量（REE、呼吸商（RQ）、V CO(2)、V O(2)）的平均偏差分别为268±702千卡/天、-0.0±0.2、26.4±118.2和51.6±126.5毫升/分钟。相同四个变量的相应一致性界限都很大。此外，Bland和Altman分析显示，使用Cosmed K4 b(2)数据预测的REE与测量的REE之间的平均偏差（-194±603千卡/天）比使用Deltatrac代谢监测仪数据（73±197千卡/天）更大。
两种设备之间的变异性非常高，并且检测到一定程度的测量误差。与预测值相比，Cosmed K4 b(2)的数据提供了可变的结果，因此，它似乎不是测量成年人的有效设备。
