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Acute physical stress in the form of immobilization resulted in a decrease in the concentration of immunoreactive beta-endorphin (IR-BE) in the anterior pituitary (AP) and an increase in the concentration of IR-BE in the neurointermediate lobe of the pituitary (NIL) and the plasma. Hypothalamic IR-BE was not influenced by immobilization. In response to chronic cardiovascular (physiological) stress...