Accession Number : AD0423077

Title :   THORACIC CAGE IMPEDANCE MEASUREMENTS IMPEDANCE PRODUCT SYSTEM,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS

Personal Author(s) : Kinnen,Edwin ; Kubicek,William

Report Date : OCT 1963

Pagination or Media Count : 10

Abstract : The measurement of (1) peak-to-peak amplitude of a percent change of impedance measured acrowss the thorax, (2) heart rate as a beat-to-beat d.c. voltage level, and (3) the product of these two variables is performed by an impedance product system. Results show tat the peak amplitude can be measured by a charge storage and transfer system accurately to within 3%. The cardiac tachometer is linear within 2.5% in a range from 50 to 250 beats/min. TMultiplication of the two variables is accomplished with Pace TR-10 analog computer components with an error of less than 1%. Overall accuracy of the system appears to be within 5%. Tests on several subjects illustrate the change in impedance product with time following the cessation exercise. (Author)

Descriptors :   (*THORAX, BLOOD VOLUME), SIGNALS, INSTRUMENTATION, DETERMINATION, CARDIOVASCULAR SYSTEM, CIRCUITS, IMPEDANCE BRIDGES

Distribution Statement : APPROVED FOR PUBLIC RELEASE