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Postural control in a simulated saturation dive to 240 msw.

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dc.contributor.author Goplen, Frederik Kragerud eng
dc.contributor.author Aasen, T. B. eng
dc.contributor.author Nordahl, Stein Helge G. eng
dc.date.accessioned 2011-07-18T08:36:36Z
dc.date.available 2011-07-18T08:36:36Z
dc.date.issued 2007 eng
dc.identifier.citation Undersea and Hyperbaric Medicine 34(2): 123-130 en_US
dc.identifier.issn 1066-2936 eng
dc.identifier.uri http://hdl.handle.net/1956/4842
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_US
dc.language.iso eng eng
dc.publisher The Undersea and Hyperbaric Medical Society eng
dc.title Postural control in a simulated saturation dive to 240 msw. eng
dc.type Journal article eng
dc.type Peer reviewed eng
dc.subject.nsi VDP::Medical disciplines: 700::Clinical medical disciplines: 750::Otolaryngology: 755 eng
dc.rights.holder Copyright 2007 Undersea and Hyperbaric Medical Society. With permission from the Undersea and Hyperbaric Medical Society.
dc.rights.holder The Undersea and Hyperbaric Medical Society. eng
dc.type.version publishedVersion eng
bora.peerreviewed Peer reviewed eng


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