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A human calorimeter for the direct and indirect measurement of 24 h energy expenditure

Published online by Cambridge University Press:  26 April 2012

M. J. Dauncey ,
P. R. Murgatroyd  and
T. J. Cole
M. J. Dauncey
Affiliation:
University of Cambridge and Medical Research Council, MRC Dunn Calorimetry Group, ARC Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
P. R. Murgatroyd
Affiliation:
University of Cambridge and Medical Research Council, MRC Dunn Calorimetry Group, ARC Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
T. J. Cole
Affiliation:
University of Cambridge and Medical Research Council, MRC Dunn Calorimetry Group, ARC Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
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Abstract

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1. A calorimeter for the continuous measurement of heat production and heat loss in the human subject, for at least 24 h, is described. The calorimeter operated on the heat-sink principle for direct calorimetry and an open-circuit system for indirect calorimetry.

2. Sensible heat loss was measured using a water-cooled heat exchanger, and the temperature of water entering the heat exchanger was controlled to maintain a mean temperature gradient of zero across the chamber walls.

3. Evaporative heat loss was determined from ingoing and outgoing wet-and-dry bulb temperatures and air flow-rates.

4. Problems associated with the calculation of evaporative heat loss and the estimation of the volume of incoming air in open-circuit systems are considered.

5. The calibration, limits of accuracy, sources of error and experiments with subjects are discussed.

Type
Papers of direct relevance to Clinical and Human Nutrition
Information
British Journal of Nutrition , Volume 39 , Issue 3 , May 1978 , pp. 557 - 566
Copyright
Copyright © The Nutrition Society 1978

References

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