Peculiarities of the functional state of external respiration of primary school children during adaptation to different efforts

Aim. To study the peculiarities of external respiratory functioning in boys of 8, 9 and 10 years in various periods of the academic year at rest, after a dosed dynamic and static loads. Methods. Examined were 38 practically healthy boys with an average level of physical development. Observation was conducted in three age groups of boys: 8, 9 and 10 years. The functional state of the respiratory system was assessed by the magnitude of lung volumes and ventilation parameters. The test with an isometric load was performed in a sitting position by squeezing a dynamometer in the left hand with a force equal to 50% of the maximal effort produced within 1 min. Results. In the 8-year-old boys noted was the tension of the functional state of the respiratory system at the beginning of the academic year. By the year of the end, the static load causes a decrease of the reserves of external respiration and static lung volumes, and an increase of the frequency component. In the 9-year-old boys at all study periods the static load leads to less favorable shifts in the respiration parameters in comparison with the dynamic load. In the 10-year-old boys at the beginning of the academic year both types of loads lead to adverse shifts of the parameters of external respiration, by the middle of the year adaptive capacities of the respiratory system become optimized. Conclusion. Local static load causes adverse shifts in the respiratory system of the primary school children, accompanied by a decrease in efficiency of the ventilation function of the lungs and by adverse reaction of the parameters of biomechanics.

respiratory system, physical load, primary school children, ontogenesis