Intentional tremor on a helium-oxygen chamber dive to 49.5 ATA

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Intentional tremor on a helium-oxygen chamber dive to 49.5 ATA

Show simple item record Berghage, TE en_US Lash, LE en_US Braithwaite, WR en_US Thalmann, ED en_US 2006-08-24T02:54:32Z 2006-08-24T02:54:32Z 1975 en_US
dc.identifier.citation Undersea Biomed Res. 1975 Sep;2(3):215-22. en_US
dc.identifier.govdoc NEDU-75-14
dc.identifier.other Undersea Biomed Res en_US
dc.identifier.uri PMID: 15622740 en_US
dc.description Undersea and Hyperbaric Medical Society, Inc. ( ) en_US
dc.description.abstract Tremor is a well-recognized manifestation of the high pressure nervous syndrome (HPNS). As such, its measurement and analysis during deep hyperbaric exposures can be an important index of central nervous system integrity. During the U.S. Navy's experimental chamber dive to a depth equivalent to 1600 fsw (49.5 ATA), objective measures of intentional tremor were obtained at several depths. Six subjects were pressurized in 6 days to 49.5 ATA. After spending 7 days at this pressure, they were decompressed in 19 days to the surface. Measures of intentional tremor were obtained predive and at pressure levels of 13.1, 31.3, 49.5, 40.4, and 31.3 ATA using the Naval Medical Research Institute Mark 3 Mod 1 tremor device. Each subject's microtremor was measured while he produced a force of 50 grams and 500 grams against a finger force transducer. Unlike previous studies of HPNS tremor, special attention was given to amplitude rather than frequency analysis. All subjects displayed a marked increase in tremor that interfered with fine motor performance at depths greater than 1000 fsw. A statistically significant increase in signal frequency was also observed. en_US
dc.format.extent 998850 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights Undersea and Hyperbaric Medical Society, Inc. ( ) en_US
dc.source.uri null en_US
dc.subject hyperbaric en_US
dc.subject chamber en_US
dc.subject.mesh Calibration Decompression Diving/adverse effects* Diving/physiology Equipment Design Helium/administration & dosage High Pressure Neurological Syndrome/complications High Pressure Neurological Syndrome/physiopathology* Humans Male Motor Skills* Oxygen/administration & dosage Partial Pressure Tremor/etiology Tremor/physiopathology* Substances: Helium Oxygen en_US
dc.title Intentional tremor on a helium-oxygen chamber dive to 49.5 ATA en_US

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This item appears in the following Collection(s)

  • 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.
  • Navy Experimental Diving Unit (NEDU)
    These are technical reports from the US Navy Experimental Diving Unit.

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