[Assessment of the tension of heart regulatory mechanisms during mental activity]

A new approach to the assessment of the degree of tension of mechanisms of heart rhythm regulation in subjects during mental activity was presented in the article. We can determine such a degree by comparing adaptation reaction of heart activity in subjects during their mental activity with homeostatic range reactivity scale of the mechanism of heart rhythm regulation for each single operator. Homeostatic diapason of reactions of heart rhythm regulatory mechanisms was determined using passive orthostatic and clinostatic functional tests. Kholter monitoring technique has been applied to determine average R-R heart-intervals. An analysis of heart rhythm variability has been carried out using 5-minute ECG records in sitting, orthostatic (80 degrees), clinostatic (-30 degrees) states and during mental activity of the subjects. 3-hour computer test has been used as mental work for the subjects. The study showed individual differences in the degree of tension of mechanisms of heart rhythm regulation under definite mental activity. Assessment of the degree of tension of adaptation mechanisms of heart activity may help in determination of potential capability of each individual to certain type of work.