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In young men (19.0 ± 0.9 years of age), the following parameters were studied during the annual cycle: the tidal and minute lung volumes, vital and forced vital capacities of the lungs, expiratory and inspiratory reserve volumes, 0.5-and 1-s forced expiratory volumes, and Tiffenau index. Young men working under the conditions of the North (62°N) proved to have deeper breathing; the minute volume and vital capacity of their lungs were increased. Analysis of the lung volume during the annual cycle demonstrated changes in most parameters studied (except the expiratory reserve volume and Tiffenau index). The maximum values of the lung volumes were recorded in the cold time of the year (from November to April), whereas the minimum values were observed in the warm time (from May to September). [ABSTRACT FROM AUTHOR]