Abstract
The following aspects were studied during the annual cycle in young men (aged 19.0 ± 0.9 years) living in northern European Russia (62°N): the peak and instantaneous volumetric flow rates (PVFR and IVFR, respectively) at the moments of expiration of 25, 50, and 75% of the forced vital capacity of the lungs (FVC); the average volumetric expiratory flow rate in the process of expiration from 25 to 75% of FVC; the respiratory rate; and the time of attainment of PVFR and FVC. The pulmonary function parameters were determined using an SPM-01-R-D microprocessor spirograph. It was found that only the velocity characteristics of the external respiratory function significantly (the F test) changed in young men during the annual cycle; the time functions were not significantly different. A greater variation in the velocity parameters of the external respiratory function was found during the annual cycle compared to those for the inhabitants of temperate latitudes, which is indicative of adaptive reactions of the external respiratory function and a slightly restricted bronchial patency at the level of mediumand, especially, small-caliber bronchi. The PVFR and IVFR at the moments of expiration of 25, 50, and 75% of FVC and the average volumetric expiratory flow rate in the 25–75% range of the FVC in the male residents of the North are higher during the cold season and lower in the warm season.
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Original Russian Text © N.G. Varlamova, B.G. Evdokimov, O.V. Rogachevskaya, E.R. Boiko, 2010, published in Fiziologiya Cheloveka, 2010, Vol. 36, No. 3, pp. 123–129.
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Varlamova, N.G., Evdokimov, B.G., Rogachevskaya, O.V. et al. Dynamic characteristics of the external respiratory function in young male residents of the north during the annual cycle. Hum Physiol 36, 353–359 (2010). https://doi.org/10.1134/S0362119710030163
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DOI: https://doi.org/10.1134/S0362119710030163