DETERMINATION OF A PRESSURE BREATHING SCHEDULE FOR IMPROVING +Gz TOLERANCE

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Authors
  1. Pecaric, M.
  2. Buick, F.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
A base of empirical data for developing optimal pressure breathing during +Gz (PBG) schedules is lacking. Relaxed +Gz-intensity tolerance with PBG was measured during gradual +Gz-onset rate centrifuge profiles using standard lightbar criteria. Constant PBG levels ranging from 18-73 mm Hg were randomly assigned. G-suit pressure followed the standard or an increased inflation schedule. Nine subjects wore a jerkin, CSU-15/P G-suit, and TLSS helmet and mask. With mean mask cavity pressures of 0, 18, 38, 60, and 73 mm Hg, corresponding +Gz-tolerances (mean + or - S.E.M.) were : 5.3 + or - 0.2, 5.8 + or - 0.1, 6.6 + or - 0.2, 7.3 + or - 0.3, and 7.5 + or - 0.3 Gz (linear correlation, r = 0.994). Increased G-suit pressure did not change the +Gz-tolerance improvement with PBG. The inverse of individual subject regression slopes ranged from 22.6 to 58.1 mm Hg/+Gz. TRUNCATED
Report Number
DCIEM-91-54 — Reprint
Date of publication
15 Jul 1992
Number of Pages
7
Reprinted from
Aviat Space Environ Med, vol 63, 1992, p 572-578
DSTKIM No
92-02750
CANDIS No
105587
Format(s):
Document Image stored on Optical Disk;Originator's fiche received by DSIS

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