[abstract] LIFE SUPPORT SYSTEM EVALUATION OF THE "NEWTSUIT" (ATMOSPHERIC DIVING SUIT) DURING A SIMULATED WORK AND REST CYCLE.

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[abstract] LIFE SUPPORT SYSTEM EVALUATION OF THE "NEWTSUIT" (ATMOSPHERIC DIVING SUIT) DURING A SIMULATED WORK AND REST CYCLE.

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Title: [abstract] LIFE SUPPORT SYSTEM EVALUATION OF THE "NEWTSUIT" (ATMOSPHERIC DIVING SUIT) DURING A SIMULATED WORK AND REST CYCLE.
Author: Hashimoto, A; Takaai, Y; Nakabayashi, K; Ito, A
Abstract: BACKGROUND: We evaluated the life support system performance of the NEWTSUIT atmospheric diving suit (manufactured by Hard Suit, Inc. in Canada) during a simulated work and rest cycle on six male subjects. METHODS: The work and rest cycle consisted of a set of five-minute arm swings at the rate of 30 times antero-posteriorly per minute (light work), leg swing (moderate work) and both arm and leg swing (heavy work) interrupted by a five-minute rest in between. Each subject repeated the set twice. The total time of the test for each subject was 60 minutes. The NEWTSUIT encapsulating a subject was hung by a chain hoist in the water from the ceiling of the water tower. The suit ambient CO2percent, O2percent, pressure, relative humidity and temperature were continuously measured during the test. When the O2percent indicator installed inside the suit showed below 18percent, O2percent was manually injected by the subject in addition to the constant O2 flow of 300 to 400 cc/min depending on the subject's weight. RESULTS: The CO2percent increased over 5percent during most of the five-minute work and decreased below 2percent during the 5-minute rest but never got back to the normal atmospheric level. The cabin pressure synchronized with O2 injection rather than CO2 accumulation. The relative humidity became close to 100percent soon after the beginning of the measurement in all cases. The ambient temperature was higher by 2 to 3 degrees Celsius than the surrounding water temperature. CONCLUSION: It was suggested that the CO2 scrubber unit was not efficient enough to lower the accumulated CO2 when the work continues. A CO2 analyzer should be installed inside the suit to monitor the ambient CO2percent since the cabin pressure gage would not indicate the accumulated CO2.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/545
Date: 1996

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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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