Accession Number : AD0704888

Title :   EXPOSURE LIMITS FOR CHIMPANZEES AT NEAR VACUUM FOLLOWING RAPID DECOMPRESSION.

Descriptive Note : Final rept. Jul 64-Dec 69,

Corporate Author : AEROMEDICAL RESEARCH LAB (6571ST) HOLLOMAN AFB N MEX

Personal Author(s) : Koestler,Alfred G.

Report Date : DEC 1969

Pagination or Media Count : 84

Abstract : Six chimpanzees were decompressed from 179 mm Hg (breathing 100 percent oxygen) to less than 2 mm Hg in 0.8 seconds and remained at this pressure altitude 180 or 240 seconds. Following repressurization within 30 seconds, using 100 percent oxygen, to 179 mm Hg, subjects were maintained at this pressure altitude for a minimum of 4 hours. Four subjects did not survive the experimental conditions. Results of these decompressions which were the concluding tests in a series of 24 decompressions conducted over the last 4 years demonstrate that a 3-minute tenure at near vacuum constitutes the maximum safe exposure limit. Complex behavioral tasks, physiological parameters (ECG, respiration, and skin temperature), cortical and deep implant EEG data, as well as detailed physical examinations seem to confirm previous findings, that exposure to near vacuum either results in death or in complete recovery with no apparent long term detrimental effects as determined by behavioral tasks. (Author)

Descriptors :   (*DECOMPRESSION SICKNESS, TOLERANCES(PHYSIOLOGY)), STRESS(PHYSIOLOGY), HIGH ALTITUDE, OXYGEN, PRESSURE, BEHAVIOR, PHYSIOLOGY, CHIMPANZEES, VACUUM

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE