Blood Flow Measurements Under High-G Conditions: Early Prediction of Gz Tolerance.

Abstract

A method is presented for the prediction of man's +Gz tolerance in human centrifuge experiments without exposing the subject to excessive levels of positive gravity. The parameter that is measured is blood velocity in the temporal artery using an ultrasonic doppler velocimeter. Rather than using the cessation of forward blood velocity as an end point in +Gz tolerance studies, it is possible to use physiologic compensatory responses to decreased cerebral blood pressure as predictors of ultimate cessation of blood flow to the head. Five subjects were exposed to five different +Gz onset ramps and the results are discussed in this report.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1983
Accession Number
ADA134653

Entities

People

  • L. Hrebien

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Aircrafts
  • Arteries
  • Blood
  • Blood Flow
  • Cardiovascular Physiological Phenomena
  • Cardiovascular System
  • Control Sticks
  • Flight Simulators
  • G Suits
  • Heart Rate
  • Hydrostatic Pressure
  • Lower Extremity
  • Measurement
  • Peripheral Vision
  • Security
  • Standards

Readers

  • Brain and Cognitive Science; Experimental Psychology; Cognitive Neuroscience
  • Fluid Dynamics.
  • Trauma Surgery or Emergency Medicine.