- de·con·di·tion·ing -'dish-(ə-)niŋ n a decrease in the responsiveness of heart muscle that sometimes occurs after long periods of weightlessness and may be marked by decrease in blood volume and pooling of the blood in the legs upon return to normal conditions
* * *de·con·di·tion·ing (de″kən-dishґən-ing) a change in cardiovascular function after prolonged periods of weightlessness, probably related to a shift of a quantity of blood from the lower limbs to the thorax, resulting in reflex diuresis and a reduction of blood volume.
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