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Estimating Energy Needs in Nutrition Support Patients
Author(s) -
Frankenfield David C.,
Ashcraft Christine M.
Publication year - 2011
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 - 10.1177/0148607111415859
Subject(s) - thermogenesis , hypermetabolism , resting energy expenditure , basal metabolic rate , energy expenditure , obesity , emaciation , specific dynamic action , energy metabolism , calorimetry , medicine , metabolic rate , body weight , energy requirement , endocrinology , mathematics , statistics , thermodynamics , physics , regression
Determination of energy needs is a fundamental part of nutrition support. The amount of metabolically active tissue mass is the major determinant of metabolic rate. The other components of total energy requirement in an adult are physical activity, diet‐induced thermogenesis, and illness hypermetabolism. Measurement with indirect calorimetry is possible but not common. Measurement can capture the effect of body size, diet‐induced thermogenesis, and illness on metabolic rate but usually not the effect of physical activity. More often, the energy need is calculated based on its association with body weight and composition. Many equations have been proposed over the years, as have adjustments to body weight in an attempt to capture the distorting effect of body composition in obesity and emaciation. Some equations capture the effects of illness and diet‐induced thermogenesis without the need for modification; some require multiplication with various factors. None predict the energy expenditure from physical activity. In determining the energy prescription, all of the component parts must be considered, regardless of whether energy expenditure is measured or calculated.