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Postural control in a simulated saturation dive to 240 msw.

F K Goplen1, T Aasen, S H G Nordahl

  • 1Dept. of Otolaryngology, Head & Neck Surgery, Haukeland University Hospital N-5021 Bergen, Norway.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|May 25, 2007
PubMed
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Deep diving significantly increases postural sway due to high ambient pressure, affecting balance even after compression. This effect appears linked to absolute pressure, not just compression rate.

Area of Science:

  • Human physiology
  • Diving medicine
  • Biomechanics

Background:

  • Increased ambient pressure is known to affect postural sway.
  • Previous studies have not investigated postural sway at the extreme pressures examined here.

Purpose of the Study:

  • To document postural sway at previously unstudied high pressures (240 msw).
  • To investigate potential mechanisms behind pressure-induced postural imbalance.

Main Methods:

  • Eight subjects underwent a dry chamber dive to 240 msw (2.5 MPa) saturation.
  • Postural sway was measured using a force platform, assessing center of pressure path length.
  • Tests were conducted with eyes open/closed and on different surfaces.

Main Results:

Related Experiment Videos

  • Mean postural sway increased by 26% at 240 msw on a bare platform with eyes open (p < 0.05).
  • A trend towards improved sway was observed with eyes closed on foam rubber (p = 0.1).
  • Postural sway normalized during the decompression phase.

Conclusions:

  • Deep diving at 240 msw results in measurable postural sway increase, independent of compression rate.
  • This imbalance is likely related to absolute pressure, potentially impacting the vestibulo-ocular reflex.
  • Findings suggest high pressure itself contributes to postural instability during saturation dives.