MAXIMUM INTRA-THORACIC PRESSURE WITH PBG AND AGSM

Authors
  1. Buick, F.
  2. Hartley, J.
  3. Pecaric, M.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Positive pressure breathing during +Gz (PBG) and anti-G straining maneuvers (AGSM) each improve +Gz tolerance by increasing blood pressure through increases in intra-thoracic pressure, but the maximal intra-thoracic pressure from their combined effect is not known. Six subjects performed: (i) maximal AGSM at +1Gz; (ii) assisted PBG (constant 60 mm Hg) at +Gz; (iii) submaximal AGSM at +Gz (enough to maintain peripheral vision); (iv) maximal AGSM at +Gz; and (v) combined PBG and maximal AGSM at +Gz. They wore: TLSS mask/helmet ensemble, CSU-15/P G-suit, and TLSS-style jerkin. Intra-thoracic pressure was measured with a catheter tip pressure transducer in the esophagus (Pes). Gastric pressure was also measured (Pga). For both Pes and Pga, there were no significant differences among experimental conditions (i), (iv) and (v). Group mean Pes and Pga in these 3 conditions were 139 and 197 mm Hg, respectively. TRUNCATED
Report Number
AGARD-CP-516-PAP-7 — @Paper presented at the Aerospace Medical Panel Symposium, Pensacola, Florida, USA, 29-30 April 1991; CONTAINED IN 92-00992; See also DSIS 92-03583
Date of publication
15 Oct 1991
Number of Pages
9
DSTKIM No
92-00990
CANDIS No
103883
Format(s):
Originator's fiche received by DSIS

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