Impairment of Cardiovascular and Vasomotor Responses During Tilt Table Simulation of "Push-Pull" Maneuvers

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Authors
  1. Goodman, L.S.
  2. LeSage, S.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
Numerous studies have shown that tolerance to ositive acceleration (+Gz) is impaired subsequent to an exposure of less than +1 Gz. Vasodilation indusced by antecendent negative Gz (-Gz) exposure delays sympathetic vasoconstriction during subsequent +Gz, further reducing G-tolerance. There were 20 subjects tested on an electronic tilt table, and exposed to the following randomized head-up tilt (HUT) and head-down tilt (HDT) conditions: +75 degrees HUT for 60 s, followed by transition to either 0 degrees (supine) HDT, or -25 degrees HDT, or -45 degrees HDT for 7 or 15 + or - tilt rate of 45 degrees - s 1(-). This was followed by HUT, divided into three periods: HUT: (equals to 3-10 s), HUT2 (equals to 15-22 s), and HUT3 (equals to 27-35 s).TRUNCATED
Keywords
Push-Pull Effect;Cardiovascular regulation
Report Number
DRDC-TORONTO-SL-2001-113 — Scientific Literature
Date of publication
01 Oct 2002
Number of Pages
10
Reprinted from
Aviation, Space and Environmental Medicine, vol 73, no 10, 2002, p 971-979
DSTKIM No
CA021742
CANDIS No
518478
Format(s):
Hardcopy

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