■ Hydrostatic pressure is applied in all directions of submerged objects (Pascal's Law)
■ The deeper the depth of submersion the greater the force. Thus, magnitude of this pressure can be adjusted by depth of immersion
■ On common beneficial effect on LL with submersion is to decrease oedema.
■ Normal pressures used to decrease LL oedema in inflatable boots vary from 40-70 mm Hg, and the hydrostatic pressure on the feet with in hydrotherapy usually also falls within this range
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