ENERGY-METABOLISM IN INFANTS AND CHILDREN

Energy is used continuously in the body and is fundamental to physiolo gic processes. Requirements of individuals vary in relation to a wide variety of factors, making energy metabolism an issue of great importa nce to the pediatrician. Techniques are available for short- and long- term measurements of energy expenditure, which serve different purpose s. The principal techniques are suitable for the age range from birth to adolescence. The theory of energy metabolism is briefly discussed, including a summary of the different working definitions. The principl es and practicalities of classical indirect calorimetry, the doubly la beled water method, the bicarbonate method, and heart rate monitoring are then described. (C) Elsevier Science Inc. 1998.