Accession Number : ADA105065


Title :   Effects of Anti-G Measures on Gas Exchange.


Descriptive Note : Final rept. 1 Apr 78-31 May 81,


Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF PHYSIOLOGY AND BIOPHYSICS


Personal Author(s) : Modell,Harold I


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a105065.pdf


Report Date : May 1981


Pagination or Media Count : 65


Abstract : This project was designed to serve as the first step to examine various aspects of gas exchange during high sustained gravitational stress (HSG) and the influence of commonly used protective measures on the gas exchange process during HSG. Studies focused on four apsects of the problem: (1) Effects of G-suit abdominal bladder inflation on oxygen delivery at +1Gz; (2) Interaction of pulmonary mechanics and G-suit bladder inflation during +Gz stress (3) Time course of gas exchange detriment during +Gz stress; and the influence of G-suit abdominal bladder inflatio on that deteriment; and (4) Use of Krypton-81m as a means of examining continuously the topographical distribution of ventilation. Results in canine studies that, while the G-suit abdominal bladder helps maintain oxygen delivery at low +Gz levels, its use at higher +Gz levels contributes to the gas exchange detriment. The increased detriment is associated with regional lung compression resulting from abdominal bladder inflation. Data indicate that exposure to HSG with G-suit abdominal bladder inflation is sufficient to cause atelectasis even though the subject breathes air. (Author)


Descriptors :   *GAS EXCHANGE(BIOLOGY) , OPTIMIZATION , INTERACTIONS , STRESS(PHYSIOLOGY) , REDUCTION , PROTECTION , GRAVITY , G SUITS , INHIBITION , ATELECTASIS , INFLATING


Subject Categories : Stress Physiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE