Dynamic Comparison of Current Ballistocardiographic Methods
S. A. Talbot,W. K. Harrison +1 more
TLDR
The nature and magnitude of force artefacts in the ballistocardiogram (BCG) arising from coupling the body to ground was discussed, and the size of these errors and their bearing on multilateral recording were discussed.Abstract:
In part I was discussed the nature and magnitude of force artefacts in the ballistocardiogram (BCG) arising from coupling the body to ground. The effect of this grounding on the reading of cardiovascular motion, momentum and force was explained, using the simple one-mass dynamics. Part II dealt with the effects on the ballistocardiogram of a second mass, a platform supporting the body. The body itself is a cutoff filter (of the resonant type) by its springy supporting tissues which couple the body and platform masses. In the displacement ballistocardiogram this attenuates the upper frequencies recorded from stiffly sprung platforms, or from the direct-body whatever its coupling to earth. In the acceleration record, the body mass and spring cut off the lower ballistocardiographic frequencies, while platform mass and body-spring cut off the higher frequencies. The size of these errors and their bearing on multilateral recording were discussed.)read more
Citations
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Journal ArticleDOI
Theory and Developments in an Unobtrusive Cardiovascular System Representation: Ballistocardiography
TL;DR: It is pertinent to revise all the information available on the ballistocardiogram’s physiological interpretation, its typical waveform information, its features and distortions, as well as the state of the art in device implementations.
Journal ArticleDOI
The mechanism of cardiovascular action of nitroglycerine. An example of integrated response during the unsteady state.
TL;DR: It is concluded that nitroglycerine relieves ischemia by enhancing oxygen delivery rather than by altering load, and changes in chemical and/or mechanical efficiency may also play a role.
Journal ArticleDOI
Physical basis of ballistocardiography. III.
H.C. Burger,Abraham Noordergraaf +1 more
TL;DR: Two methods for calculating the amplitude characteristic of the high-frequency BCG, the difference in movement of subject and BCG taken into account, are compared and discussed.
Journal ArticleDOI
Wide frequency range force ballistocardiogram; its correlation with cardiovascular dynamics.
TL;DR: The ballistocardiograms of young normal subjects as recorded with a wide frequency range technic are described and an analysis of these components in terms of known cardiovascular events strongly suggests that they have definite dynamic significance.
Journal ArticleDOI
The nature of records from ultra-low frequency ballistocardiographic systems and their relation to circulatory events
William R. Scarborough,William R. Scarborough,Edgar F. Folk,Edgar F. Folk,Patricia M. Smith,Patricia M. Smith,Joseph H. Condon,Joseph H. Condon +7 more
TL;DR: The general characteristics of normal human displacement, velocity, and acceleration from an ultra-low frequency (ULF) ballistocardiogram system have been described and tentative views were expressed concerning the origin of some of the waves of normal ballistOCardiograms.