Accession Number : ADA337565

Title :   Middle Cerebral Artery Blood Flow Velocity After Exposure to Sustained +Gz.

Descriptive Note : Interim rept. Jan 96-Jun 97,

Corporate Author : WRIGHT STATE UNIV DAYTON OH

Personal Author(s) : Kovitaya, Manaswee ; Tripp, Lloyd D., Jr. ; Chelette, Tamara L.

PDF Url : ADA337565

Report Date : JUN 1997

Pagination or Media Count : 39

Abstract : Anecdotal information has been available for many years that G training over time increases a human's ability to tolerate G. However, little data exist to corroborate the observation. The main thrust of this study was to quantify the accumulative physiological effects of +Gz exposure on cerebral blood flow using transcranial Doppler. A total of six male and six female subjects participated in this study. The subjects experienced numerous G exposures ranging from 2.5 to 5.2 % during three days of centrift%ge training. Total time at (i>1 was 5.3 minutes. Changes in middle cerebral artery blood flow velocity during a squat-stand orthostatic challenge test before and after G exposures and then within seven days after each day of G exposure were observed. No significant changes in middle cerebral artery blood flow velocity were found. Further studies with more subjects, higher & levels, and more repeated & exposures of longer duration are suggested.

Descriptors :   *BLOOD VESSELS, *HEMATOLOGY, *PULMONARY BLOOD CIRCULATION, VELOCITY, PHYSIOLOGICAL EFFECTS, DATA ACQUISITION, HUMAN BODY, CEREBRAL CORTEX, BLOOD CELLS, SONOGRAMS.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE