[Use of some biochemical and physico-chemical indices for the evaluation of lung function in healthy school-age children]. / Ispol'zovanie nekotorykh biokhimicheskikh i fiziko-khimicheskikh pokazatelei dlia otsenki funktsii legkikh u zdorovykh detei shkol'nogo vozrasta.

The biochemical and physicochemical characteristics of nonrespiratory pulmonary functions were determined in 255 children of school age according to the condensate of exhaled air. As compared to the younger children, those belonging to the senior age groups manifested an increase of specific respiratory moisture loss. As compared to winter, specific respiratory moisture loss in summer was found to be decreased; the condensate of exhaled air was discovered to have a higher content of total protein, elevated concentration of surface active substances in the lung surfactant, and to show a certain tendency towards reduction of the intensity of the processes of free radical oxidation. No sex-associated differences were established between the characteristics under study.