Wells J C, Fuller N J
Dunn Clinical Nutrition Centre, Cambridge.
Eur J Clin Nutr. 1998 Jul;52(7):536-40. doi: 10.1038/sj.ejcn.1600604.
To determine within-machine and between-machine precision (reproducibility) and accuracy, of the Deltatrac Mk 1 Metabolic Monitor.
Within-machine and between-machine comparison for gas exchange (VO2 and VCO2), respiratory quotient (RQ) and energy expenditure (EE).
3 Deltatrac Mk 1 Metabolic Monitors.
Within-machine and between-machine reproducibility were assessed by five successive 10 min gas infusion tests in each machine. Accuracy was assessed by measuring independently the gas content of the infusion mixture. The Deltatrac flowmeters were evaluated by further infusion tests.
Within-study reproducibility was < 1 ml/min for VCO2, < 2.5 ml/min for VO2, < 5 kcal/d for EE and < 0.01 for RQ. Between-study reproducibility was < 0.2% for RQ, < 1% for VCO2 and < 2% for VO2 and EE. Between-machine reproducibility was < 0.1% for RQ and < 1% for VO2, VCO2 and EE. Accuracy in all three machines was within 3% for VO2, VCO2 and EE, and within 0.2% for RQ.
The Deltatrac Mk 1 is a very precise metabolic monitor, and is accurate within 3% for gas exchange and EE. RQ is measured with greatest reproducibility and accuracy (within 0.2%), making the monitor particularly suitable for studies of substrate utilisation.
测定Deltatrac Mk 1代谢监测仪的机器内和机器间精密度（再现性）及准确性。
对气体交换（VO2和VCO2）、呼吸商（RQ）和能量消耗（EE）进行机器内和机器间比较。
3台Deltatrac Mk 1代谢监测仪。
通过在每台机器上连续进行5次10分钟的气体输注测试来评估机器内和机器间的再现性。通过独立测量输注混合物的气体含量来评估准确性。通过进一步的输注测试对Deltatrac流量计进行评估。
研究内再现性对于VCO2＜1 ml/分钟，对于VO2＜2.5 ml/分钟，对于EE＜5 kcal/天，对于RQ＜0.01。研究间再现性对于RQ＜0.2%，对于VCO2＜1%，对于VO2和EE＜2%。机器间再现性对于RQ＜0.1%，对于VO2、VCO2和EE＜1%。所有三台机器中VO2、VCO2和EE的准确性在3%以内，RQ的准确性在0.2%以内。
Deltatrac Mk 1是一种非常精密的代谢监测仪，在气体交换和EE方面的准确性在3%以内。RQ的测量具有最高的再现性和准确性（在0.2%以内），使得该监测仪特别适合用于底物利用的研究。
