[abstract] RAPID COMPRESSION TO 31 ATMOSPHERES.

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[abstract] RAPID COMPRESSION TO 31 ATMOSPHERES.

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Title: [abstract] RAPID COMPRESSION TO 31 ATMOSPHERES.
Author: Hamilton Jr, RW; Schmidt, TC; Langley, TD
Abstract: Diving support of oil exploration on the outer continental shelves requires a diver to perform short tasks at depths between 500 and 1000 feet of sea water. The most effective and probably safest method of carrying out these tests involves a rapid compression to the working depth followed by an immediate decompression to the surface or to an intermediate "storage" depth. In a series of experiments--called Access-- we performed laboratory simulation of several short dives to 800 and 1000 fsw. Compressions were made to 800 and 1000 fsw from sea level and to these depths from holding depths of 500 and 600 fsw. Compression rates were 100 feet per minute with one or two one-minute stops. Moderate exercise was performed at maximum depth, and various performance tests were given. Tremor, EEG, EMG, end-respiratory CO2, and heart rate were monitored. Rapid compressions from sea level cause a marked increase in hand tremor and slight but consistent decreases in psychomotor performance. Mental function was not tested but appeared to be unaffected. The divers felt that they could have accomplished a typical underwater task with no difficulty. In the compressions from an intermediate holding depth--100 feet per minute--virtually no effects of rapid compression whatsoever were seen. Hyperbaric arthralgia was no problem in either case. The breathing gas was 3.1% oxygen and 13% nitrogen, balance helium, to give a bottom gas mixture of 1.2 atmospheres of oxygen and about 4 atmospheres of nitrogen. This regime is physiologically tolerable and causes an acceptable performance decrement; and hence is practical. At sea we will use a somewhat slower compression.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 10-11, 1974. Hilton Hotel, Washington, D.C. (http:www.uhms.org)
URI: http://archive.rubicon-foundation.org/29
Date: 1974

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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