Renal Responses of the Recumbent Nonhuman Primate to Total Body Water Immersion

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Abstract
The extent to which thoracic translocation of blood and abdominal compression contribute to the diuresis and natriuresis during head-out water immersion was studied in the anesthetized nonhuman primate. Neither a diuresis nor natriuresis occurred in animals immersed in the recumbent posture to a depth such that the abdomen was subjected to the same water pressure as during head-out upright immersion. The abdominal compression observed during upright immersion does not contribute per se to the renal responses; the immersion-induced translocation of blood to the thorax may be the causal factor during this volume stimulus.