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Woiwitz等在1969年测出:老年人每增加1岁,动脉血氧分压平均降低3mmHg。根据人体生理的一般生长发育变化情况,大体上25岁以前为发育阶段,25～44岁为成熟阶段,45岁以后进入衰退阶段。
Woiwitz et al. (1969) measured an average decrease in arterial oxygen pressure of 3 mm Hg for each additional 1 year of age in the elderly. According to the general physiological growth and development of human physiology, generally 25 years before the development stage, 25 to 44 years of maturity stage, 45 years later into the recession stage.