Dynamic modelling of cardiovascular responses during orthostatic stress


  1. Lu, Z.
  2. Melek, W.
  3. Kapps, A.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Engineering Services Inc, Toronto ONT (CAN)
This final report summarized the investigation of a subject's dynamic cardiovascular responses during orthostatic stress. For the purposes of this investigation, a toolbox dubbed CROST (Countermeasures Research on Orthostatic Stress) has been designed. The toolbox automatically generates and statistically analyzes dynamic models that reveal the dynamic behavior of the cardiovascular system during pitch and roll rotations: models for up/down tilt, pitch/roll rotations, different tilt onset/offset rates, and dwell times. The blood pressure dynamics is characterized by the physiologically significant indices associated with the models. Furthermore, using maneuver profile data, such as tilt orientation (pitch or roll), tilt direction (up or down), rotation rate (15, 30, 45 deg/sec) and head-down dwell time (7, 15, 30 sec) as well as the physiological indices, a set of fuzzy logic models is generated automatically by CROST. These dynamic and fuzzy-logic models assist in providing an operationally important predictive view on the characteristics of blood pressure responses to orthostatic stress induced by pitch and roll rotations. TRUNCATED duced by the head-up (HU) rotation is significantly higher (p < 0.05) in roll
CROST (Countermeasures Research on Orthostatic Stress);Orthostatic stress;GTE (G-transition effect)
Report Number
DCIEM-CR-2002-08 — Contractor Report
Date of publication
07 Jan 2002
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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