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KMID : 0608619960060040065
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Korean Journal of Aerospace and Environmental Medicine
1996 Volume.6 No. 4 p.65 ~ p.71
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Influence of Hydrostatic Pressure and Central Blood Pooling on Peripheral Skin Blood Flow
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Abstract
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The peripheral cutaneous vascular response to hydrostatic pressure change is the result of a variety of local regulatory mechanisms. Postural which affects the venous return can trigger compensatory hemodynamic responses of a central origin via
baroreceptors.
The purpose of this study was to investigate which regulatory mechanism, local or central, was the cause of the responses of cutaneous vessels above and below the hydrostatic indifference point (HIP) to -6˚ head-down tilt.
Ten young medical students were selected as the experimental volunteers.
When one arm was elevated maintaining supine body position, the ipsilateral finger blood flow decreased, but the vascular distensibility increased When the arm was lowered, two parameters both decreased. In the passive legs elevation, the vessels
of the
ear lobe and finger showed non-significant responses in spite of cardiac output increase. In the postural changes from the supine to the -6˚ head-down, the ear lobe and forearm blood flows increased, not in the case of the finger blood flow and
cardiac
output.
It seems that finger and ear lobe vessels are not participated in the regulatory mechanisms of the central origin responding to-6˚head-down tilt, Facial puffiness which appears during actual space flight may be due to an inability of the facial
vessels
in counteracting increased transmural pressure, which can lead to passive vasodilation.
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