Baroreceptor reflex and arterial rigidity in schoolchildren

In this work there is shown a variability of heart rate and time delay of pulse wave of main arteries in schoolchildren.There is used the function of ordinary coherence of HR and DPW (time delay of pulse wave). This function reflects the rate of statistical linear relation of two processes in heart and blood vessels. A high tone of sympathetic part of vegetative nervous activity in schoolchildren increases CO (cardeiac out), shortens the hard connection phase of HR and DPW and results in a new system characteristic--arterial rigidity. There are presented results of passive orthostatic test and pharmacological tests on activation of sympathetic part of vegetative nervous activity in schoolchildren with heart rate problems.     

Baroreceptor reflex and arterial rigidity in adolescents

The heart rate (HR) variability and pulse wave delay (PWD) in the major arteries of schoolchildren were studied. The function of ordinary coherence of the HR and PWD was used, which reflects the linear relationship between the two processes in the heart and vessels. The high tone of the sympathetic part of the autonomic nervous system (ANS) in schoolchildren causes an increase in heart performance and decreases the shift in the phase of association between HR and PWD, which leads to the appearance of a new characteristic of the system, arterial rigidity. The results of the physiological activation of the sympathetic part of ANS during passive orthostasis and pharmacological trials with blockers of ANS receptors in schoolchildren with heart arrhythmia at rest are presented.     

Orthostatic circulatory disorders in schoolchildren

The circulation control in syncope has been studied in schoolchildren by means of the Kentavr computer system. The functional tilt table test has been used to study the response to orthostasis in healthy students (control) and adolescents with lipothymia. It is concluded that the passive orthostatic test is efficient for differential diagnosis of the type of faint and is important for comprehensive examination of schoolchildren.     

Functional State of 11- to 12-Year-Old Schoolchildren under Conditions of Intense Academic Load Assessed by Heart Rate Variability

The functional state of sixth-grade children was estimated on the basis of heart rhythm variability data. It was found that the heart rate variability was closely correlated with learning progress during both intensive and nonintensive methods of education. The highest adaptation tension was observed in children with good learning progress during intensive methods of education.