[Effect of intensive motor activity in different periods of time on the human functional state and efficiency].

Effects of heavy physical work on gas-energy exchange, cardiac activity, thermal condition, nervous system and the subjective status were evaluated in 43 athletes in the morning, afternoon and evening. It was shown that same muscular work done at the ambient temperature of 17 +/- 1 degrees C, relative humidity of 65 +/- 3% and air flow of 0.3 +/- 0.1 m/s requires a significantly higher straining of the body functions in the evening hours (after 06.00 p.m.).

[Participation of adrenal hormones in the genesis of arterial hypertension of hypothalamic origin]. / Ob uchastii gormonov nadpochechnikov v geneze arterial'noi gipertenzii gipotalamicheskogo proiskhozhdeniia

Continuous many-hour stimulation of the hypothalamic negative emotiogenic centres (ventromedial nuclei) evoked a stable arterial hypertension with a peculiar phasic dynamics of the adrenal secretory activity in waking immobilized rabbits. Bilateral extirpation of the adrenal glands decreased the initial level of the average arterial pressure, inhibiting development of stable arterial hypertension. Many-hour stimulation of the mentioned structures also produced stable arterial hypertension in adrenalectomized rabbits if preceded by the administration of hydrocortisone together with adrenaline. Against the background of separate administration of hydrocortisone and adrenaline to adrenalectomized rabbits, many-hour stimulation of the ventromedial hypothalamus evoked a short-term rise in the arterial pressure. A conclusion was drawn that activation of hormones of the adrenal cortical and medullary layers played an important part in the formation of stable arterial hypertension in rabbits under continuous many-hour stimulation of the hypothalamic negative emotiogenic centres.