[Impact of exercise on cardiac hemodynamic parameters in students].

Functional changes were studied in first-year students performing exercises. Analyzing the findings indicated that a 500-m race caused unidirectional varying changes in young women and young men. The functional systems of the first-year students responded to strenuous exercises due to the tension of cardiac rhythm regulatory mechanisms, which manifested itself as almost 4.5-fold increase in the activity of the sympathetic regulatory circuit. Excessive tension that was a result of long-term inactivity may be further a cause of disproportionally developed cardiac chambers, leading to myocardial hypertrophy, cardiac arrhythmia, weakened valvular apparatus.

[Cardiac rhythm in pupils during tests].

Variation pulsometry was used to study changes in the activity of cardiac rhythm regulating mechanisms in third-form pupils from a comprehensive school (a control group) and a gymnasium (a study group) under mental stress caused by the performance of mathematical tests. Two types of responses of the studied parameters: sympathetic (in the study group) and parasympathetic (in the control group), which were determined by the richness and intensity of an academic load and by the readiness of both categories of school-children, were identified.

[Change of cardiodynamic parameters and the heart rhythm in students under influence of the academic load].

Dynamics psychological and cadriohemodynamical parameters and activity regulators mechanisms of a rhythm of heart of students in current of academic year is studied. It is shown, that process of adaptation of students to an academic load is accompanied by the periods of recession and a pressure parameters of hemodynamic, activity regulators mechanisms of a rhythm of heart and parameters of state of health, activity and mood. The periods of the highest pressure of physiological systems of an organism of students are the beginning of the first semester and the examination period. The adaptive changes of investigated parameters occurred in the course the academic year.

[The functional status of students carrying a mental load].

The paper shows psychological and cardiac hemodynamic changes in students performing an hour mental test of a program on a computer. There are synchronous reductions in the magnitude of cardiac hemodynamic indices and in the activity of the sympathetic pattern of cardiac rhythm regulation in the examinees.