Lisovsky B. Functional State of Cardiovascular and Respiratory System of Students of Different Somatic Health Groups

Correlation between the state of cardiovascular and respiratory system and the students' somatic health level was investigated. The analysis of heart rate variability indexes and spirometrical research of students with various amount of maximal oxygen absorption that reflects health reserves of an individual, allowed to single out certain peculiarities of the regulatory mechanisms in the resting state and also during the stepwise increasing cycloergometric exercise. It was established that the students with the "below safe" somatic health level had the reduced reserves of regulation. Investigation of the functional state of external respiratory apparatus discovered the reduction of power reserves of the students who had the "below safe" somatic health level. It was accompanied by the higher indices of air resistance in respiratory tract that limited the possibilities as to the sustention of required pulmonary ventilation under the conditions of intensive exercise. The study showed that the boys whose somatic health level was "below safe" had the significant difference with the other researched groups as to the indices of ERV, FEVPEF, Tiffno index (inspiration test). In the groups of girls these significant differences were revealed in the variation of FEV1/FVC. Physical exercise led to the increase in LF/HF ratio in comparison with the resting state that was accompanied by the reduction of HFms2 quantity that testified to the increase in the activity of central control circuit against the background of decrease in parasympathetic influence. In the groups of girls whose somatic health level was "below safe" the LF/HF ratio was considerably higher than that the representatives of the other researched groups had, during all the stages of cycloergometric exercise. The quantities of LF (ms2), HF (ms2), VLF (ms2) in the groups of boys and girls whose somatic health level was "below safe" during the graduated cycloergometric exercise (Р 1, Р 2, Р 3) were to a great extent lower than those the representatives of the other groups had. These variations were accompanied by the increase in VPR. During the recovery period, the reduction of the somatic health level was accompanied by the reduction of the quantities of ТР (ms2), LF, (ms2) HF (ms2) and the increase of VPR in the groups of boys and girls.