Download or read book Respiratory Mechanics During Forward Acceleration written by John F. Watson and published by . This book was released on 1961 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Static relaxation pressure volume curves of the thorax and lung were obtained on 4 trained subjects while in the supine position on the human centrifuge at 1, 2, 3, and 4 g. As acceleration increased, the intrapulmonic pressure increased for a constant volume shifting the pressure volume curve downward and to the right. Compliance of the thorax and lung decreases from 1 to 4 g as the result of the fall in pulmonary mid-position. Inspiration during 4 g acceleration, regardless of the end expiratory position was always active. Elastic work of breathing approximately doubles from 1 to 4 g while non-elastic work does not change. Absolute lung volumes during acceleration decrease proportionately with the exception of residual volume which did not change. Since these changes are similar to those described during negative pressure breathing, positive pressure breathing is suggested as a means by which respiration during forward acceleration may be improved and toleration increased."--Abstract.
Download or read book Respiratory Mechanics During Forward Acceleration written by John F. Watson and published by . This book was released on 1960 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Static relaxation pressure volume curves of the thorax and lung were obtained on 4 trained subjects while in the supine position on the human centrifuge at 1, 2, 3, and 4 g. As acceleration increased, the intrapulmonic pressure increased for a constant volume shifting the pressure volume curve downward and to the right. Compliance of the thorax and lung decreases from 1 to 4 g as the result of the fall in pulmonary mid-position. Inspiration during 4 g acceleration, regardless of the end expiratory position was always active. Elastic work of breathing approximately doubles from 1 to 4 g while non-elastic work does not change. Absolute lung volumes during acceleration decrease proportionately with the exception of residual volume which did not change. Since these changes are similar to those described during negative pressure breathing, positive pressure breathing is suggested as a means by which respiration during forward acceleration may be improved and toleration increased."--Abstract
Download or read book Effect of Positive Pressure Breathing on the Respiratory Mechanics and Tolerance to Forward Acceleration written by John F. Watson and published by . This book was released on 1961 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main factors limiting tolerance to forward acceleration are dyspnea, chest pain, and difficulty in inspiring. Previous studies of the mechanics of respiration during forward acceleration revealed the following: (1) lung volumes decreased proportionately with the exception of residual volume; (2) resting midpulmonary position decreased; (3) intrapulmonic pressure increased for a constant volume; (4) static and dynamic pulmonary compliance decreased; (5) elastic work of breathing increased due to the work necessary to overcome the additional resistance resulting from acceleration. The effects of positive pressure breathing on lung volumes and time tolerance to forward acceleration of 12 trained subjects were studied. Positive pressure breathing significantly increased lung volumes, particulary the expiratory reserve volume. This increase in lung volumes was associated with a 67 percent mean increase in time tolerance. Positive pressure breathing is therefore both a practical and physiologically sound countermeasure by which tolerance to forward acceleration can be improved and human safety during prolonged exposures increased.
Download or read book Ventilatory Response to Forward Acceleration written by Fred W. Zechman and published by . This book was released on 1959 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Transverse Acceleration on Pulmonary Function written by Neil S. Cherniack and published by . This book was released on 1959 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Transversely Applied Acceleration on Lung Mechanics in Man written by D. H. Glaister and published by . This book was released on 1975 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Argon boluses were used to study the distribution of ventilation in subjects exposed to acceleration up to 5G whilst lying in prone, supine and left and right lateral postures. Transpulmonary pressure was also recorded. Closing volume was increased in prone and supine postures and, at any given volume, lung compliance decreased. In lateral decubitus, acceleration produced a step in the expired argon plateau at about 50% VC which coincided with a flatter part of a complex pressure-volume curve. It is argued that the weight of mediastinal structures causes a discontinuity in the vertical gradient of transpulmonary pressure of some 5 cm water per G, and at higher levels of acceleration the two lungs ventilate sequentially. A two compartment model was used to demonstrate that all observations could be accounted for on the basis of increased lung weight, with no change in the mechanical properties of individual units.
Download or read book Distribution of Blood Flow and Ventilation in the Lung During Forward Gx Acceleration written by D. H. Glaister and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of the Cerebral Blood Volume Under Normal Conditions and Gravitational Stresses written by I︠U︡riĭ Evgenʹevich Moskalenko and published by . This book was released on 1968 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Translation written by and published by . This book was released on 1974 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiology of Man in Space written by J. H. U. Brown and published by Academic Press. This book was released on 2013-10-22 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physiology of Man in Space describes the physiological responses of man under the extremes of space flight. This book is composed of eight chapters that specifically examine the physiological responses of astronaut under zero gravity conditions. The introductory chapter demonstrates how human neuromuscular system can withstand the stresses of short-term space travel. The succeeding chapters describe human responses under space acceleration stress. These topics are followed by discussions on human stress tolerance capacity; psychological aspects of space flight; instrumentation in biomedical capsules in space flight; and the phenomenon of space weightlessness. The final chapter deals with the impact of the environment on the man and the impact that the man has on the environment, including environmental, metabolic, and waste removal parameters. This book is of value to space scientists and researchers.
Download or read book Technical Publications Announcements with Indexes written by United States. National Aeronautics and Space Administration and published by . This book was released on 1962 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASD Technical Report written by United States. Air Force. Systems Command. Aeronautical Systems Division and published by . This book was released on 1961 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Human Tolerance to Prolonged Forward and Backward Acceleration written by Neville P. Clarke (Captain, USAF (VC)) and published by . This book was released on 1958 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Human Factors Engineering Bibliographic Series written by and published by . This book was released on 1966 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Annotated Bibliography of the Physiology of Respiratory Mechanics and Its Applications in Health and Disease written by John Clifford Stickney and published by . This book was released on 1968 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foundations of Space Biology and Medicine bk 1 2 Ecological and physiological bases of space biology and medicine written by and published by . This book was released on 1975 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foundations of Space Biology and Medicine Space medicine and biotechnology written by and published by . This book was released on 1975 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
