1. Measurements of oxygen consumption (VO2) and carbon dioxide production (VCO2) can be used to calculate energy expenditure. Such data are useful in the nutritional management of a variety of pathological conditions.

2. This study is an evaluation in vitro and in vivo of the mating of a canopy and a Beckman metabolic measurement cart 1 (MMC). The canopy allows for the collection of expired gases without facial attachments.

3. Studies in vitro demonstrated the necessity of calibrating the CO2 analyser at the concentrations used in such a system (0.50-0.80% CO2). Measurements of Vo2 were within +12% to −8% of predicted values, and when calibrated at 0.50% and 0.75% CO2, measurements of Vco2 were within +2% and −7% of predicted values.

4. The studies in vivo revealed that VO2 and Vco2 were within ± 11% of the values obtained by using a canopy-spirometer-computer system.

5. The MMC plus canopy may provide an alternative method for the clinical measurement of Vo2 and Vco2, especially in subjects unable to tolerate a tight-fitting mask for prolonged periods.

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