Abstract: A method of obtaining physical and/or chemical characteristics of a biological medium, comprising submitting said medium to at least two currents Ii of different strength and frequency fi, by means of a first group of electrodes, measuring the voltage drop Ui in said medium by means of a second group of electrodes, positioning a first element of the first group of electrodes and a second element of the second group of electrodes in a first zone of said medium, and positioning a third element of the first group of electrodes and a fourth element of the second group of electrodes in a second zone of said medium.

Abstract: Apparatus and procedure for measuring volumes and global and segmental corporal composition in human beings, by means of measuring the electrical impedance at various frequencies, determining in this manner, the ratio between the intracellular water and the extracellular water volumes, the contents of total and extracellular water in each segment and the contents of the segmental lean mass. The apparatus is made up of a computer (11) which controls an electronic box (12), fed through a feeding source (14), various electrodes (13) coming out from said electronic box (12) which are placed on the body under research.