Accession Number:

ADA207543

Title:

Non-Invasive Evaluation of Cephalic Blood Flow in the +Gz Environment

Descriptive Note:

Final rept. Jul 1985-Jan 1988

Corporate Author:

DREXEL UNIV PHILADELPHIA PA BIOMEDICAL ENGINEERING & SCIENCE INST

Personal Author(s):

Report Date:

1988-09-25

Pagination or Media Count:

45.0

Abstract:

Impairment of vision and consciousness under acceleration stress in the footward direction Gz has been attributed to interruption of blood flow to the brain and retina. During the initial exposure ot Gz stress, the volume of blood available to neural tissues is also a significant factor because of the oxygen buffering effects of hemoglobin. The rheoencephalogram REG reflects changes in cephalic volume and is convenient, non-invasive and non-intrusive. Some of the drawbacks previously perceived for the REG have been ameliorated through technical innovation, while others have proven not to be of concern. Indeed the artifact seen with position changes and respiratory maneuvers is actually a source of useful information in the context of Gz studies. A device has been constructed that has successfully operated under stresses as great as 14 Gz and - 1.5 Gx. REG recording have been taken human volunteers during NAVAIRDEVCEN centrifuge rides under a variety of acceleration stress situations an protective maneuvers and devices.

Subject Categories:

  • Medicine and Medical Research
  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE