A whole body transportable indirect calorimeter for human use in the tropics.

Details

Serval ID
serval:BIB_EC3DC01F386F
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A whole body transportable indirect calorimeter for human use in the tropics.
Journal
European Journal of Clinical Nutrition
Author(s)
Charbonnier A., Jones C.D., Schutz Y., Murgatroyd P.R., Whitehead R.G., Jéquier E., Spinnler G.
ISSN
0954-3007 (Print)
ISSN-L
0954-3007
Publication state
Published
Issued date
1990
Volume
44
Number
10
Pages
725-731
Language
english
Abstract
A transportable, whole body indirect calorimeter, designed for use in the tropics, is described. The calorimeter was built to study energy expenditure of people having chronically or acutely low levels of food intake, and it will help to determine energy adaptations made by individuals with restricted food intake. The calorimeter comprises two units: a 27 m3 ventilated chamber connected to an office housing control and monitoring equipment. The system also allows the experimenter to assess the rate of energy expenditure by means of a ventilated hood or a baby respiration chamber. The incoming air flow rate is variable and is typically set at approximately 30 l/min. Carbon dioxide production (VCO2) and oxygen consumption (VO2) are continuously monitored by means of differential gas analysers via a computerized data acquisition unit. Gas production/consumption rates are measured with a delay of 80 s, the complete response to step changes in VCO2 or VO2 consumption being calculated over 15 min using the rate of change terms in the gas exchange equations. The total electrical power required for the whole system is 12 kW. The calorimeter has been functioning for nearly 4 years in a rural village of The Gambia during which ambient temperatures have ranged from 16 to 44 degrees C and dewpoints from -8 to 24 degrees C. The performance and accuracy of the calorimeter were tested using 20 per cent CO2 in N2 infusion and butane burning. Agreement between the theoretical and the measured values was found to be 99 per cent for VO2 and 100 per cent for VCO2 with a precision for both gases of +/- 10 ml/min over a 1-h period.
Keywords
Calorimetry, Indirect/instrumentation, Energy Intake, Energy Metabolism, Humans, Oxygen Consumption, Tropical Medicine/instrumentation, Tropical Medicine/methods
Pubmed
Web of science
Create date
21/01/2008 13:09
Last modification date
20/08/2019 16:14
Usage data