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A Single, Accurate Measurement of Resting Metabolic Expenditure
Author(s) -
Stokes Maurice A.,
Hill Graham L.
Publication year - 1991
Publication title -
journal of parenteral and enteral nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.935
H-Index - 98
eISSN - 1941-2444
pISSN - 0148-6071
DOI - 10.1177/0148607191015003281
Subject(s) - parenteral nutrition , enteral administration , resting energy expenditure , medicine , calorimetry , energy expenditure , measure (data warehouse) , mathematics , computer science , thermodynamics , physics , database
Indirect calorimetry is widely used in estimating nutritional requirements for severely ill patients. However, because the accuracy of a single measurement is dependent on many factors, the authors have sought to find the optimal single measurement. It is shown here that a more accurate resting metabolic expenditure (RME) can be obtained by studying a fasted, rested patient in relaxing surroundings after acclimatizing him or her to the calorimetric hood. Using this altered protocol, a significantly lower RME (by a mean of 125 kcal/d, p < 0.0001) is achieved. This RME compares well with most of the various predictive equations. A predictive equation, based on the normal patients in this study and relating the RME to TBK (a measure of the body cell mass), allows calculation of a predicted RME, and subsequently a Stress Index as a measure of metabolic stress, ie, Predicted RME = TBK x 0.34 + 4.94. Stress Index = Measured RME/Predicted RME ( Journal of Parenteral and Enteral Nutrition 15 :281–287, 1991)