THOMPSON, Thompson, and Dailey [1928] made the discovered that if an individual remaind stationary in the erect posture his total plasma volume gradually diminised for about half an hour when it reached a constant level of appoximately about 12p.c less than in the recumbent posture.Continue reading hematocrit increased in a way to indicate thattotal cell volume remains unaffected. closely parallel to theThis change is an increase in the number of red blood cells, the specific gravityof blood and plasma protein concentration, along with aProvision for decline in the proportion of water in the plasma. Theirfigures onlythat in the upright position with an absolute diminution in the amount ofwater and diffusible substances in circulation; and they offeredthat the loss is the result of a physical filter throughthe capillaries of the lower extremities due to the increased verticalposture of hydrostatic pressure in them.
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