[Correlations between the indices of the state of the sympathetic-adrenal and of the hypophyseal-adrenal systems and the level of insulin in horses under various exposures].

The content of adrenaline, noradrenaline, ACTH, cortisol and insulin in the blood and excretion of catecholamines with urine were studied in horses after physical and emotional exposures. The highest degree of the sympathoadrenal system (SAS) and hypophysioadrenal system (HAS) activation followed by the insulin content decrease was observed after training. The known emotional exposure (the noise of hyppodrome) astivated both parts of SAS and HAS. The unknown emotional experience (electronic music) produced a strong adrenal medullar reaction. Analysis of the correlations showed that the initial background hormonal level predetermines the further activation of the system exposed to stressful situations. The reciprocal relations between the hormonal and mediator parts of SAS at rest are transformed to common activation under training. The level of the activity of one part of SAS monitors the other one. A relationship was established between SAS and HAS as well as between insulin and catecholamine content under physical and emotional exposures.