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A Computer Method for Studying the Postexercise Ballistocardiogram
The postexercise ballistocardiogram has been shown to be a useful diagnostic tool but has its limitations because of artifacts which result from muscle tremor and respiratory movement, especially if the exercise is vigorous. An electronic system incorporating a small computer previously suggested for clearing electrocardiographic records of artifacts has been applied to the recording of low frequency ballistocardiograms obtained before and after standardized exercise. Evaluation of the postexercise tracings as to accurate reproduction and good quality shows this system to be feasible for use in a large scale postexercise ballistocardiographic study. The system presented also lacks the complexity of the one used with electrocardiograms. Any difficulties in reproduction were found to be those inherent in the ballistocardiographic apparatus rather than in the system itself. Lines for further investigation are pointed out. (Author).
Factors Contributing to the Ballistocardiographic Wave Form in Healthy Middle Aged Males
The availability of a large number of variables derived from clinical and laboratory evaluations of 200 middle aged males made it possible to relate them statistically to the BCG waves. Numerous significant correlations were found and these are discussed. It appears that, until the factors and their interrelationships are more precisely evaluated, the strictly quantitative use of BCG standards derived from groups to determine such things as stroke volume, among others, must be regarded with caution. The results seem to indicate that serial BCG's will be necessary for complete evaluation of an individual's cardiovascular status. (Author).
A Study of the Ballistocardiographic Test-retest Reliability
Qualitative evaluation of large numbers of ballistocardiograms (BCG's) has indicated that considerable variation exists within a single BCG record and between records obtained on the same individual on different days. Because the extent to which BCG records can be reliably reproduced appears to be essentially unknown, it seems of interest to investigate quantitatively the reliability of measures obtained from these records. Further, since respiration condition has been thought to influence BCG results, and because of the availability of two differing designs of BCG apparatus (Air Bed and Suspended Bed), the study was extended to examine measurements obtained on both beds under five respirato...
Ballistocardiography
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