Postural control in a simulated saturation dive to 240 msw.

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Postural control in a simulated saturation dive to 240 msw.

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dc.contributor.author Goplen, FK
dc.contributor.author Aasen, T
dc.contributor.author Nordahl, SH
dc.date.accessioned 2008-04-20T02:20:42Z
dc.date.available 2008-04-20T02:20:42Z
dc.date.issued 2007
dc.identifier.citation Undersea Hyperb Med. 2007 Mar-Apr;34(2):123-30. en
dc.identifier.issn 1066-2936
dc.identifier.other 17520863
dc.identifier.uri http://archive.rubicon-foundation.org/6464
dc.description Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc. en
dc.description.abstract INTRODUCTION: There is evidence that increased ambient pressure causes an increase in postural sway. This article documents postural sway at pressures not previously studied and discusses possible mechanisms. METHODS: Eight subjects participated in a dry chamber dive to 240 msw (2.5 MPa) saturation pressure. Two subjects were excluded due to unilateral caloric weakness before the dive. Postural sway was measured on a force platform. The path length described by the center of pressure while standing quietly for 60 seconds was used as test variable. Tests were repeated 38 times in four conditions: with eyes open or closed, while standing on bare platform or on a foam rubber mat. RESULTS: Upon reaching 240 msw, one subject reported vertigo, disequilibrium and nausea, and in all subjects, mean postural sway increased 26% on bare platform with eyes open (p < 0.05) compared to predive values. There was no significant improvement in postural sway during the bottom phase, but a trend was seen toward improvement when the subjects were standing with eyes closed on foam rubber (p = 0.1). Postural sway returned to predive values during the decompression phase. DISCUSSION: Postural imbalance during deep diving has been explained previously as HPNS possibly including a specific effect on the vestibulo-ocular reflex. Although vertigo and imbalance are known to be related to compression rate, this study shows that there remains a measurable increase in postural sway throughout the bottom phase at 240 msw, which seems to be related to absolute pressure. en
dc.format.extent 802164 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Undersea and Hyperbaric Medical Society, Inc. en
dc.subject DIVING en
dc.subject saturation en
dc.subject posture en
dc.subject human en
dc.subject disequilibrium en
dc.subject high pressure nervous syndrome en
dc.subject vestibulo-ocular reflex en
dc.subject.mesh Adult Caloric Tests Confidence Intervals Decompression Diving/physiology* Dizziness/etiology Dizziness/physiopathology High Pressure Neurological Syndrome/etiology High Pressure Neurological Syndrome/physiopathology* Humans Male Middle Aged Musculoskeletal Equilibrium/physiology* Posture/physiology* Sensation Disorders/etiology Sensation Disorders/physiopathology* Time Factors Vertigo/etiology Vertigo/physiopathology en
dc.title Postural control in a simulated saturation dive to 240 msw. en
dc.type Article en

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