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Related Experiment Video

Updated: Jul 14, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

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

Summary

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.

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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:

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.