FORCE BALLISTOCARDIOGRAPHY

Abstract

A method is presented to compensate for the mechanical properties of the body which prevent an adequate determination of heart force from the oscillating body motion produced by the force. The ballistogram recordings of the heart force were corrected to correlate directly with the heart action. The frequency response characteristic FRC and B of the external body network (all of the body mass except the heart and liver) was electrically measured with the subject on a shake-table, the head in a free-swinging hammock, and the hands gripping fixed electrode rods above the table. A correcting network was then inserted into the recording system to produce a frequency response characteristic of the measuring system which was inversely proportional to FRC and B.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1952
Accession Number
AD0012715

Entities

People

  • Wolf W. Von Wittern

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Calibration
  • Cathode Followers
  • Electrical Circuits
  • Electrical Networks
  • Electronic Circuits
  • Frequency
  • Frequency Response
  • Generators
  • Measurement
  • Medical Laboratories
  • Oscillators
  • Periodic Functions
  • Recording Systems
  • Transducers
  • Vibration

Readers

  • Cardiovascular Physiology
  • Electrical Engineering
  • Seismology