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The energy expenditure at rest can be measured by Icorestimatedby predictive equations. For instance, it is said that the Harris-Benedict equation, which is the most used, estimates the resting energy expenditure with an accuracy of ± 10% in 80% to 90% of normal individuals. When used in critically ill patients, however, this equation correctly predicts the expenditure in less than 50% of subjects. This variability is related to the severity of the disease, changes in body composition, altered metabolic activity and multiple thermogenic clinical interventions [1]. |
