THORACIC CAGE IMPEDANCE MEASUREMENTS IMPEDANCE PRODUCT SYSTEM

THORACIC CAGE IMPEDANCE MEASUREMENTS IMPEDANCE PRODUCT SYSTEM

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Kinnen,Edwin, Kubicek,William
Format: Report
Sprache:eng
Schlagworte:
AMPLITUDE
BLOOD VOLUME
CARDIOVASCULAR SYSTEM
CIRCUITS
DETERMINATION
HEART
IMPEDANCE BRIDGES
INSTRUMENTATION
SIGNALS
THORAX
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Beschreibung
Zusammenfassung: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)