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All figures (9)
Table 1V. Average values and standard deviations for restoring jorce and damping as the 3 subjects were tightened on our HF table
Table V. Averages of the di’erences found between the four main systolic waves of ULF and HF ballistocardiograms in 30 healthy men and 20 healthy women
Fig. 2. Our ULF ballistocardiograph. A, The table. B, “Mine jacks,” columns of heavy pipe extending between floor and ceiling to support the frame from which the table is suspended. Only the base is shown in the figure. C, Support wires. D, Lateral support. F, Coils shown withdrawn from magnets E. G, Footboard.
Table VII. Comparison of the clinical interpretation given to HF and ULF records secured on the same persoq in 250 patients
Table III. Effect of tightening the subject on the HF table. The frequency and damping of movement between subject and table under various conditions
Fig. 19. Response of the ULF instruments to a triangular shaped internal acceleration of the center of gravity 2, (proportional to internal force) (boltom in B, D, F, and H). A, (kq5) The acceleration ib of the T’LF instrument for cases a and d of Fig. 18,A and B. D, (lop) The displacement xb of the HF instrument for the same cases. F, (top) The acceleration ?b of the ULF instrument for cases a and d of Fig. 18,D and E. H, (top) The displacement xb of the HF instrument for the same cases.
Fig. 4. Our newest HF ballistocardiograph, shown tilted, and in the horizontal position in which it is usually employed. A, The table. Neither the S-cm. suspension nor the strong restraining spring is shown. The table is made of 24 st aluminum, and with the footplate and bracing weighs 24 kilograms. B, The footplate. C. Movable crossoiece and DiDes L I which attack it to ‘footplate, used ‘to support the shoulder yoke. D, Main table frame of cold rolled steel, weighing 110 kilograms. E, Base frame of cold rolled steel, also weighing 110 kilograms. F, The lifting mechanism, which weighs about 90 kilograms. Between base frame and floor are 4 pads of corrugated rubber and 2 of cork, each about 7 by 7 cm. and 7 mm. thick.
Fig. 5. Diagram of the movement of the body on a HF table, or on any other immobile surface, when a force applied headward or footward is suddenlv released.
Fig. 17. Forces registered in ULF records after a transient force has been applied and withdrawn as rapidly as possible. Top row: Typical examples of records secured after the subject was tapped on the head. Bottom WW: Typical examples of records obtained when a thread attached around the chest, neck, or feet was pulled until it broke. Note the secondary vibrations set up and the slow return to the base line often seen. The record was attenuated until the ballistocardiogram was hardly detectable.
Journal Article
•
DOI
•
A comparison between ultralow-frequency ballistocardiograms and those secured by an improved high-frequency technique, with studies to explain remaining differences.
[...]
Isaac Starr
1
,
Abraham Noordergraaf
2
•
Institutions (2)
University of Pennsylvania
1
,
Utrecht University
2
01 Jul 1962
-
American Heart Journal