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Thirty-day-old rats were exposed to intermittent high altitude in barochamber (7000 m, 4 h per day, 4 exposures) and number of mono- and binucleated myocytes as well as DNA content per nucleus were determined in the right ventricular myocardium. The data indicate enhancement of mitotic division of mono- and binuclear diploid cells in hypoxic animals. Simultaneously, an increase in mononuclear and binuclear tetraploid cells occurred; the latter is probably due to DNA synthesis not followed by mitosis of some binuclear diploid cells.
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