Electrical impedance measurements have a great deal of bearing on blood distributions during respiration and the cardiac cycle. These are related to ionic electrical conduction and parallel electrical resistive shunts. This type of study deserves correlation with displacement, velocity, acceleration and force types of ballistocardiography and spirometry. Electrical impedance is a convenient tool for study of the central as well as the peripheral circulation. Quantitative percentile relations existing between right and left chest pulmonary functions are helpful in assessing effects of pulmonary disease, pulmonary surgery, pulmonary therapy and pulmonary rehabilitation progress from a dynamic viewpoint. There is an investigation to evaluate the precordial volume pulse with stroke volume. Instrumentation for resistive impedance measurement is best understood for volemic determinations from Kelvin double bridge measurements. The impedance method had no contraindications for patient examination as it was nontraumatic, nonstimulating and isothermal in its characteristics on the body segments, including the eye.