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测定１７５例不同年龄的正常人血中超氧化物歧化酶（ＳＯＤ）和谷胱甘肽过氧化物酶（ＧＳＨ－ＰＸ）活性及丙二醛（ＭＤＡ）含量。结果显示其总趋势ＳＯＤ和ＧＳＨ－ＰＸ活性随年龄增加而降低，且以ＳＯＤ为明显，而脂质过氧化的代谢产物ＭＤＡ则随年龄增高，这些变化在各组性别间无差异。表明人体衰老与自身生长发育和代谢过程中产生的自由基所触发的脂质过氧化反应损伤各系统密切有关。因此，清除体内过多的自由基对延缓衰老可能有益。
The serum levels of superoxide dismutase (SOD), glutathione peroxidase (GSH-PX) and malondialdehyde (MDA) were measured in 175 normal subjects of different ages. The results showed that the total trend of SOD and GSH-PX activity decreased with age, and the SOD was obvious, while the lipid peroxidation metabolites MDA increased with age, these changes in each group gender no difference. It shows that human aging is closely related to the damage of lipid peroxidation triggered by free radicals generated during the growth and metabolism of human body. Therefore, removing excessive free radicals in the body may be beneficial for anti-aging.