A Simple Technic and a Demonstration of Its Validity
Body motion resulting from cardiac forces may be recorded as displacement, velocity or acceleration by a variety of methods. None of these is identical with the cardiac force curve because of distortion due to body oscillations. Schwarzschild devised an electronic mixer that combines displacement, velocity, and acceleration in any proportion desired. This device permits recording ballistocardiograms that are free of oscillations due to body resonance. Validity of the technic was established by the identity of strain gage records of forces applied to a log phantom with simultaneous records obtained with the method presented.
- © 1956 American Heart Association, Inc.