An Evaluation of the Lower Coverage Anti-G Suit Without an Abdominal Bladder After Three Days of Seven Degree Head-Down Tilt.
Abstract
During space shuttle reentry, volume-depleted astronauts experience slow-onset, long- duration, low-level +G. In Phase 2, we determined that an extended coverave anti-G suit without an abdominal bladder (Reentry Anti-G Suit (REAGS)) was the most effective anti-G suit in subjects dehydrated with furosemide (Lasix). The present study (Phase 3) verified that REAGS provided effective protection for subjects dehydrated with 7 degrees head-down tilt (HDT). Twelve healthy male subjects were placed at 7 degrees HDT for 3 days, and then subjected to an acceleration profile simulating shuttle reentry while wearing the REAGS suit. Six subjects and their anti-G suit inflated when their eye-level blood pressure (ELBP) fell below 60 mmHg, while six subjects had their suit inflated when they experienced peripheral light dim (PLD). Average REAGS pressure required to maintain ELEp at or above 60 mmHg after HDT was 0.85 psig vs. 1.0 psig in subjects dehydrated with Lasix. One subject in the PLD group experienced (G-LOC); however, this may have been related to the greater cardiovascular stress induced by HDT.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1992
- Accession Number
- ADA292890
Entities
People
- Barbara J. Stegman
- Charles F. Sawin
- Robert W. Krutz Jr.
- Russell R. Burton