The feasibility of underwater computerised strain gauge plethysmography and the effects of hydrostatic pressure on the leg venous haemodynamics
Background: Strain gauge plethysmography (SGP) is employed to evaluate venous drainage of the lower leg.
Methods: In this study, SGP was used to evaluate the effects of the hydrostatic pressure (HP) of water on venous
volume (VV), expelled volume, and ejection fraction (EF) in 22 healthy legs before and during immersion in water.
Results: HP reduced VV by 100% and even more during underwater (UW) exercise, making calculation of the UW
EF possible.
Discussion: UW SGP is feasible and indicates that HP improves venous haemodynamics. This study suggests that