Chisat I, extension and validation of NOAA's new Repex procedures for habitat diving: A Chinese-American collaboration. Research Report 90-1.

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Chisat I, extension and validation of NOAA's new Repex procedures for habitat diving: A Chinese-American collaboration. Research Report 90-1.

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Title: Chisat I, extension and validation of NOAA's new Repex procedures for habitat diving: A Chinese-American collaboration. Research Report 90-1.
Author: Hamilton Jr, RW; Schane, W
Abstract: A collaborative experiment between the Chinese Underwater Technology Institute, NOAA's Office of Undersea Research, and Hamilton Research, Ltd., was conducted at CUTI's facility in Shanghai during October 1988. The experimental objectives were to extend the laboratory validation of NOAA's new Repex procedures for habitat diving (NOAA 88-1A and 88-1B). The main objective was to test the Repex decompression algorithm for multiday repetitive excursions computed on a "worst case" basis, but we also further evaluated the longer, deeper repetitive excursions (some with stops), oxygen exposure management, and saturation decompression after excursions, all from the Repex procedures. These objectives were successfully accomplished. Four experienced divers were saturated at 25 msw for 5 days, during which time they did 15 air excursions to depths between 50 and 75 msw, for times up to 240 min. Decompressions from excursions were mostly no-stop, but 5 required stops of durations from 3 to 116 min. Saturation decompression began with the "precursory" ascent following a brief return to 25 msw. Doppler bubble detections showed some bubbles, Spencer Grade II and occasionally III, following excursions and during saturation decompression, especially after muscle flexing. No symptoms of decompression sickness were reported; one diver was more than normally fatigued on one occasion. Oxygen exposure reached its peak at 6 days at 3103 Oxygen Toxicity Units, over 600 more than the Repex limit; the symptoms were mild and transient numb fingertips. No vital capacity changes greater than the normal fluctuations in measurements were seen. An unexpected change in pulmonary blood flow measured with impedance plethysmography showed a flattening of the peak of the pulse curve. This was noticed in 3 of the 4 divers and seemed most prominent during periods of high decompression stress; it could be an indication of bubbles in the pulmonary circulation and requires further study. Additional physiological and psychometric measurements showed anticipated responses. The divers consumed 5000 kcal per day. While these experimental findings are important, perhaps the most significant result was the initiation of effective scientific cooperation between scientists of these two countries in this special field. Note: The comments on events and relationships were all written prior to the unfortunate situation in Tianunmen Square during 1989 June, and have been left unchanged. Note: This document was approaching its final form when the unfortunate situation developed in Tiananmen Square during June of 1989. This of course cast a dark cloud over any prospect of future collaboration, but the suggestions for such activity and the relationships described have all been left in this report as they were or we included them as they would have been. The authors' impressions at the time are still valid, and we regard them worth reporting as they were made.
Description: Reproduction in part or in whole is permitted for any purpose.
URI: http://archive.rubicon-foundation.org/4869
Date: 1990

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