Middle Cerebral Artery Blood Flow Velocity After Exposure to Sustained +Gz.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1997
- Accession Number
- ADA337565
Entities
People
- Lloyd D. Tripp Jr.
- Manaswee Kovitaya
- Tamara L. Chelette
Organizations
- Wright State University