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Author: John F. Watson Publisher: ISBN: Category : Acceleration (Physiology) Languages : en Pages : 26
Book Description
"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.
Author: John F. Watson Publisher: ISBN: Category : Acceleration (Physiology) Languages : en Pages : 26
Book Description
"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.
Author: John F. Watson Publisher: ISBN: Category : Acceleration (Mechanics) Languages : en Pages : 20
Book Description
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.
Author: Hilding Bjurstedt Publisher: Springer Science & Business Media ISBN: 3709155606 Category : Science Languages : en Pages : 514
Book Description
This volume contains the communications and discussions of the First Inter national Symposium on Basic Environmental Problems of Man in Space, which was held 29 October - 2 November 1962 at Unesco House, Paris, under the joint sponsorship of the International Astronautical Federation (IAF) and the International Academy of Astronautics (IAA) with the cooperation and support of Unesco, the International Atomic Energy Agency (IAEA) and the World Health Organization (WHO). At this Symposium 31 communications were presented, 8 of which were from the USSR, 8 from the USA, and 15 from other countries, all by special invitation. The presentations, which included three general review papers, were made in ten half-day working sessions by a distinguished international group. The pro ceedings were not restricted to the acute professional aspects of man in space. In fact, the majority of the vast store of material contained in this volume deals with the more scientific aspects, i. e. with problems of the future, which are con tributed mainly by conventional areas of physiology and psychophysiology, including the technical research activities pertaining to the acquisition, analysis and control of biomedical data.
Author: John F. Watson
Author: John F. Watson
Author: John F. Watson
Author: United States. Air Force. Systems Command. Aeronautical Systems Division
Author: Hilding Bjurstedt
Author: 
Author: 
Author: Earl Howard Wood
Author: Defense Documentation Center (U.S.)
Author: United States. National Aeronautics and Space Administration
Author: Edward L. Michel