Comparison of the Mechanisms of Cold- and Microgravity-Induced Fluid Loss.

摘要

The physiological mechanisms involved in the diuresis and overall fluid loss associated with exposure to cold or microgravity environments are compared. Although the data available to thoroughly describe these responses are yet unavailable, some similarities in the changes caused by these different stimuli are apparent. The central mechanism common to the physiological responses to both these environments is an increase in central blood volume. The common endpoint of a net loss in body fluids and electrolytes is also clear. Differences in the response patterns also exist. The differences are evaluated, and the value of additional research in both areas, with potentially mutually beneficial results, is considered. Keywords: Low temperature; Weightlessness; Body fluids; Balance; Vasopressin; Atrial natriuretic factor; Cardiovascular function. (edc)