Functioning of the Human Heart in the Pron-Position.

Aim      To study intracardiac hemodynamics in healthy men in supine and prone positions.Material and methods  This echocardiography study included 14 apparently healthy men at a mean age of 38 years.Results In a prone position, the heart configuration and location in the chest changed, the heart rate increased by 7.

Effect of Sex on Structural and Morphological Parameters of Rat Heart under Conditions of Combined Exposure to Hypokinesia and Cold.

We studied the combined effect of hypokinesia and external cooling on structural and morphological changes in the ventricular myocardium and parameters of homeostasis of the blood system in male and female WKY (normotensive) and SHR (hypertensive) rats. Simultaneous exposure to hypokinesia and cold caused destructive processes in the myocardium and high dynamics of heart remodeling with diverse structural and morphological changes in the left ventricle in rats of both sexes. The thickness of the left ventricular wall most rapidly decreased in male hypertensive SHR rats.

Seasonal variation of right heart function in elite skiers-racers: an echocardiographic study.

Purpose: To examine seasonal variation of the right heart (RH) structure and function in elite skiers-racers.

Methods: The same group of 16 male was recruited into the study in the period of preparation for national competitions. The study was carried out at the hospital in Sykyvkar, the European North of Russia, which is located near 62° NL and 51° EL.

Effect of atrial artificial electrical stimulation on depolarization and repolarization and hemodynamics of the heart ventricle in rainbow trout Oncorhynchus mykiss.

The spatial-temporal organization of the activation, repolarization and hemodynamics of the heart ventricle in rainbow trout, Oncorhynchus mykiss, adapted to a temperature of 5-7 °C, were studied from the normal sinus rhythm (21.6 ± 4.9 bpm) to the highest possible heart rhythm (HR) (60 bpm), during which deterioration of the contractile activity of the myocardium occurred.

Changes in Total Cholesterol and Heart Rate in Normotensive and Hypertensive Rats under Combined Influence of Cold Exposure and Hypokinesia.

We studied the effect of hypokinesia alone and in combination with cold exposure on HR and total cholesterol content in the blood serum of Wistar, WKY, and SHR rats. Irrespectively of the season, hypokinesia was associated with a decrease in HR, which is probably a result of reduced body needs due to deceleration of metabolic processes. A significant increase in total cholesterol was found under conditions of cold exposure combined with hypokinesia, which indicates qualitative structural rearrangement of energy metabolism under the influence of environmental factors.