Application and Rheoencephalography to Study Physiological Responses Under Acceleration Stress.
Abstract
The use of electrical impedance plethysmography of the head, or rheoencephalography (REG), has been demonstrated in a high acceleration stress environment on human volunteer subjects. Acceleration stress was primarily applied in the head-to-foot direction and is referred to as +Gz. The REG instrument divides the cephalic impedance waveform into two components: (1) A baseline impedance signal, Zdc, that is referable to the bulk movement of blood in and out of the head caused by respiration and changes in posture, and (2) A pulsatile impedance waveform that is heart beat coincident (Zpul). The REG waveform contains information about cerebrospinal fluid (CSF) volume changes and shifts resulting from the application of acceleration stress. Blood and CSF shifts in and out of the cranial and spinal compartments impinge directly upon the overall function of the central nervous system. The high acceleration environment provides an ideal area in which to noninvasively alter cephalic fluid volumes in order to obtain basic physiologic knowledge of importance to both aviation and clinical medicine.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1991
- Accession Number
- ADA257509
Entities
People
- Barry S. Shender
Organizations
- Naval Air Warfare Center Warminster