Accession Number : AD0723829

Title :   Effects of Hyperbaric Environments on Neuromuscular Control in Primates.

Descriptive Note : Technical rept.,

Corporate Author : ARIZONA STATE UNIV TEMPE

Personal Author(s) : Sutton,Dwight ; Taylor,Eugene M. ; Burns,Jerry D.

Report Date : 01 APR 1971

Pagination or Media Count : 42

Abstract : Four monkeys were individually exposed to hyperbaric environments consisting of air, nitrogen-oxygen (pO2 = 200 mm Hg), and argon-oxygen (pO2 = 200/1000 mm Hg). Neuromuscular control was assessed via a force discrimination task during the course of simulated dives lasting 7-16 hrs. Performance decrements were related to depth and to gas mixtures. Task failure occurred at 400-500 FSW with argon-oxygen. Air was tolerated at pressures equivalent to 500-700 FSW. Nitrogen-oxygen produced total failures in force discrimination at 600-800 FSW. During compression, performance efficiency was often sustained, although other measures indicated neuromuscular control problems at relatively low pressures. Adaptation to intermediate pressures was exhibited by recovery of effectiveness in performing the force discrimination task. Related measures of cardiac function in waking monkeys revealed stability over all the pressures and gas mixes utilized in the study. The study indicates that the expression of inert gas narcosis relates to pO2 of the breathing gas and that the condition is not clearly related to unusual cardiovascular adjustments. (Author)

Descriptors :   (*NEUROMUSCULAR TRANSMISSION, *HIGH PRESSURE), PERFORMANCE(HUMAN), PRESSURE, GASES, DECOMPRESSION, PRESSURE BREATHING, CARDIOVASCULAR SYSTEM, ANESTHESIA, STRESS(PHYSIOLOGY), PHYSIOLOGY, PRIMATES, AIR, OXYGEN, NITROGEN, ARGON

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE