The heat production has been measured of Merino lambs, with the coat artificially dried, less than 7 hr old, in still air at 68”F, and of the same lambs in a wind at the same temperature, with the coat artificially wetted. Indirect calorimetry was used. When the coat was wet the heat production ranged from 18-137 per cent. higher than when it was dry. The water which evaporated from the coat ab...

The known predictive equations can present different values for basal metabolic rate (BMR) compared to those measured through indirect calorimetry. The objective of this study was to describe BMR through indirect calorimetry of overweight and obese boys (with ages between 12 and 17 years old) living in Porto Alegre, Brazil, and to compare the measured value with values estimated by predictive e...

Indirect calorimetry and oxygen consumption (VO2) are accepted tools in human physiology research. It has been shown that indirect calorimetry systems exhibit differential measurement error, where the error of a device is systematically different depending on the volume of gas flow. Moreover, systems commonly report multiple decimal places of precision, giving the clinician a false sense of dev...

Purpose: To compare the reproducibility of measurement of oxygen uptake made using the reverse Fick and indirect calorimetry methods. Methods: A custom designed system was constructed for the measurement of oxygen uptake from an anaesthetic breathing system using indirect calorimetry based on the Haldane transformation. In a series of 42 patients undergoing coronary artery surgery in the pre-ca...

OBJECTIVE To assess the adequacy of predictive equations for estimation of energy expenditure (EE), compared with the EE using indirect calorimetry in a sample of Brazilian and Spanish women with excess body weight. METHODS It is a cross-sectional study with 92 obese adult women [26 Brazilian -G1- and 66 Spanish - G2- (aged 20-50)]. Weight and height were evaluated during fasting for the calc...

BACKGROUND Indirect calorimetry (IC) is the reference method for measurement of energy expenditure (EE) in mechanically ventilated critically ill patients. When IC is unavailable, EE can be calculated by predictive equations or by VCO2-based calorimetry. This study compares the bias, quality and accuracy of these methods. METHODS EE was determined by IC over a 30-min period in patients from a...