Inhaltsangabe: Abstract: Apart from its actions on reproductive processes, prolactin (PRL) plays a role in maintaining the constancy of the internal milieu by regulation of the homeostatic processes. The present investigation focuses predominantly on the relationship between ventilatory acid-base imbalances and PRL secretion. In four studies different forms of respiratory stress were selected: inhalation of increased oxygen concentration, inhalation of increased carbon dioxide concentration, voluntary hyperventilation and repeated high intensity exercise. It was hypothezised that hyperoxia,...