Apparatus and method for the analysis of the change of body composition and hydration status and for dynamic indirect individualized measurement of components of the human energy metabolism
One embodiment of an apparatus for analysis of body composition and hydration status by detecting resistance of the human subject at zero and infinite frequency including a method for measuring indirectly extracellular water mass, intracellular water mass, lean body mass, and body fat mass daily changes of extracellular water mass, intracellular water mass, lean body mass, and body fat mass and acute changes of extracellular water mass and intracellular water mass and for individualized calibration of these indirect measurements.In addition, a method for fitting mathematical models to serial measurements of indirectly measured lean body mass and fat mass and for dynamic indirect individualized measurement using minimum variance estimation and prediction of daily changes of the body composition defined as change of glycogen store, change of fat store and change of protein store daily utilized macronutrient energy intake defined as utilized carbohydrate, fat, and protein caloric intake daily macronutrient oxidation rate defined as rate of carbohydrate oxidation, fat oxidation, and protein oxidation daily resting metabolic rate daily unknown forms of energy losses or gains daily rate of endogenous lipolysis daily nitrogen excretion daily gluconeogenesis from protein daily determination of extracellular water mass daily determination of intracellular water mass and acute change of extracellular water mass and intracellular water mass.
