PMID: 6539834May 1, 1984Paper

Human gradient-layer calorimeter: development of an accurate and practical instrument for clinical studies

JPEN. Journal of Parenteral and Enteral Nutrition
C B McManusS B Heymsfield

Abstract

A whole body gradient-layer calorimeter was designed for thermophysiologic studies in hospitalized patients. The instrument was assembled in a room adjoining a metabolic ward. The patient lies recumbent on a stretcher which is wheeled into the calorimeter on tracks. Once inside, the patient's head extends through one wall into a clear plastic canopy. The canopy is partially open on one side and is the entry point for fresh air into this open-circuit system. Heat flux transducers in the calorimeter walls, a thermopile in the exit air stream, and a platemeter in conjunction with wet and dry bulb thermometers allow measurement of total, wet, and dry heat losses from the subject. All calorimeter output signals are routed to a microcomputer system which processes the data and provides real-time output of results. A mannequin heat source is used to calibrate the gradient layer. Testing with a variety of wet/dry heat sources indicate total, wet, and dry heat measurements are accurate to within 2-3%. A typical study of resting energy expenditure requires 1 hr, and protocols of up to 6 hr are well tolerated. The calorimeter has proven to be reliable, accurate, and easy to operate. These qualities, combined with good patient tolerance, m...Continue Reading

References

Nov 1, 1972·Journal of Applied Physiology·E R NadelB Saltin
Jul 1, 1973·Journal of Applied Physiology·G SpinnlerA Vannotti

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Citations

Jan 1, 1990·Critical Reviews in Oncology/hematology·D Albanes
Feb 1, 1989·Metabolism: Clinical and Experimental·J F ReinusJ T Galambos
Nov 1, 1986·JPEN. Journal of Parenteral and Enteral Nutrition·O J McAnenaJ M Daly
Sep 14, 2018·European Journal of Clinical Nutrition·Steven B Heymsfield
Jul 10, 2017·European Journal of Applied Physiology·Glen P KennyDaniel Gagnon
Nov 1, 1988·Metabolism: Clinical and Experimental·D W NixonJ M Daly

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