The APS Journal Legacy Content is the corpus of 100 years of historical scientific research from the American Physiological Society research journals. This package goes back to the first issue of each of the APS journals including the American Journal of Physiology, first published in 1898. The full text scanned images of the printed pages are easily searchable. Downloads quickly in PDF format.
A study of the local surface velocity of the chest and abdomen as a function of the frequency of sinusoidal pressure waves introduced into the airways via the trachea, was made in 15 cats. The study confirmed and extended the observations DuBois, Brody, Lewis and Burgess had previously made in human beings and demonstrated that the effects seen were not produced by any part of the airway above the trachea. Comparison is made of this data with the averaged data obtained by using a plethysmograph to integrate the surface responses of the cat. The natural frequency (9.6, S.E. = 0.6 cps), damping factor (2.0, S.E. = 0.25), resistance ( k1 = 13.5, S.E. = 2.3 cm H2O/(l/sec.); k2 = 76, S.E. = 21 cm H2O/(l/sec.)2, and elastance (230, S.E. = 26 cm H2O/l.) were measured and the inertance (.09, S.E. = .008 cm H2O/(l/sec.2)) was calculated. The implications of these concepts and measurements for respiratory mechanics and ballistocardiography are discussed.
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