|
Rubicon Research Repository >
Rubicon Foundation Archive >
Undersea and Hyperbaric Medicine Journal >
Please use this identifier to cite or link to this item:
http://archive.rubicon-foundation.org/6464
|
| Title: | Postural control in a simulated saturation dive to 240 msw. |
| Authors: | Goplen, FK
Aasen, T
Nordahl, SH |
| Keywords: | DIVING
saturation
posture
human
disequilibrium
high pressure nervous syndrome
vestibulo-ocular reflex |
| Issue Date: | 2007 |
| Publisher: | Undersea and Hyperbaric Medical Society, Inc. |
| Citation: | Undersea Hyperb Med. 2007 Mar-Apr;34(2):123-30. |
| 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. |
| Description: | Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc. |
| URI: | http://archive.rubicon-foundation.org/6464 |
| ISSN: | 1066-2936 |
| Appears in Collections: | Undersea and Hyperbaric Medicine Journal
|
Files in This Item:
| File |
Description |
Size | Format |
|---|
| 17520863.pdf | | 783Kb | Adobe PDF | View/Open |
|
All items in DSpace are protected by copyright, with all rights reserved.
|
