Longitudinal study of performance after deep compressions with heliox and He-N2-O2

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Longitudinal study of performance after deep compressions with heliox and He-N2-O2

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Title: Longitudinal study of performance after deep compressions with heliox and He-N2-O2
Author: Lemaire, C; Murphy, EL
Abstract: This study concerns three hyperbaric experiments. During SAGITTAIRE iv, compression to 610 msw was accomplished in 11 days with an atmosphere of helium-oxygen. For the two CORAZ experiments, compression to 300 msw was done in 4 hours with He-N2-O2 trimix, varying nitrogen concentration from CORAZI (2.8 ATA N2 =9percent) to CORAZ II (1.4 ATA N2=4.5percent).Oxygen partial pressure was always maintained at 0.4 ATA except during decompression. The same two subjects participated in all three experiments and underwent the following psychometric tests: manual dexterity, visual choice-reaction time, and number ordination. Results show a large decrement in performance at 610 msw after slow compression (-50percent and -47percent on the number ordination test, -34percent and -24percent on the visual choice-reaction time). Test performance was less affected after the rapid compressions to 300 msw, and recuperation to control values occurred within 1 day at 300 msw. Our data show that 1.4 ATA N2 is less detrimental to performance than 2.8 ATA N2 for trimix compressions to 300 msw in 4 hours. Adaptation, Physiological Adaptation, Psychological Atmosphere Exposure Chambers *Atmospheric Pressure *Helium Human Motor Skills *Nitrogen *Oxygen Partial Pressure *Task Performance and Analysis Visual Perception
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: PMID: 969024
http://archive.rubicon-foundation.org/2762
Date: 1976

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  • Undersea Biomedical Research Journal
    The Undersea Baromedical Research journal was published by the Undersea Medical Society, Inc. (now the Undersea and Hyperbaric Medical Society) quarterly from 1974 to 1992 when the name changed to the Undersea and Hyperbaric Medicine Journal.

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