E. Wolińska-Witort

TL;DR: It seems unlikely that the decrease in the cortisol level after prolonged stress was caused by exhaustion of the adrenal cortex, and some central mechanisms which could account for the biphasic changes in the plasma cortisol level and for disturbances of the hormone diurnal rhythmicity under conditions of prolonged stress are discussed.

TL;DR: Increased plasma prolactin levels after stimulation seem not to have an inhibitory action on the pre-ovulatory LH release, i.e. the impairment of neuro-hormonal regulation, is discussed.

TL;DR: An attempt of interpretation of the described phenomena has been undertaken and a significant difference in the response of prolactin secretion between footshocked and immobilized animals occurred in the circadian rhythmicity of the hormone secretion.

TL;DR: The induced rise of plasma prolactin concentration in anoestrous and pregnant ewes on the days during electric stimulation showed, according to Cosinor analysis, all features characteristic for acrophase of the circadian rhythm.

TL;DR: It has previously been observed that sheep subjected to repeated and prolonged stress stimuli showed biphasic cortisol responses, and it was hypothesized that changes in the secretion of the hormone were caused by the alteration of catecholaminergic systems in the CNS.