Linear and Nonlinear Models of the Physiological Responses to Negative-to-Positive Gz Transitions

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Authors
  1. Kapps, A.
  2. Fraser, W.D.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The identification and modeling of experimental data for negative-to-positive Gz (Push-Pull) transitions discussed in this paper is aimed at predicting typical and atypical physiological responses in order to develop Push-Pull countermeasures. A novel analysis of Push-Pull data in both the time and frequency domains was developed. Eye-level blood pressure dynamics in response to Push-Pull transitions differ significantly from subject to subject. This individual sensitivity is much less profound in a sub-group of the tested subjects. Overall, the match between the predicted and measured eye-level blood pressure is much better with low Gz gradients than in the case of large Gz gradients. A model with a transfer function of low order (3 by 3) may be sufficient to match the behavior of eye-level blood pressure under both Push-Pull and positive Gz maneuvers. However, nonlinear models are required to fit blood pressure response data in a sub-group of subjects.
Keywords
Push-Pull effect;G-Induced Loss of Consciousness (G-LOC)
Report Number
DCIEM-98-P-87 — Paper
Date of publication
01 Mar 1999
Number of Pages
9
DSTKIM No
CA000006
CANDIS No
511939
Format(s):
Hardcopy;Document Image stored on Optical Disk

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