Accession Number:

AD0423077

Title:

THORACIC CAGE IMPEDANCE MEASUREMENTS IMPEDANCE PRODUCT SYSTEM,

Descriptive Note:

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS

Personal Author(s):

• Kinnen,Edwin
• Kubicek,William

Report Date:

1963-10-01

Pagination or Media Count:

10.0

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 beatsmin. 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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE