Women who give birth may be biologically "older" than women who don’t, a new study suggests.
一项新研究发现,生过孩子的女性在生理上会比那些没有生过的“更老”。
For the study, the researchers analyzed information from 1,556 US women ages 20 to 44 who took part in a national survey from 1999 to 2002, which involved giving blood samples.
在该研究中,研究人员们分析了20-44岁之间的1556名美国女性信息,她们参加了1999年至2002年期间的全国调查,并给出了血液样本。
The researchers looked at the genetic material inside the women’s cells, specifically the length of their telomeres. These are caps on the ends of chromosomes that protect the chromosomes from damage. Telomeres naturally shorten as people age, but the structures don’t shorten at the same rate in every person. The longer a person’s telomeres are, the more times their cells could hypothetically still divide, research has shown. Thus, telomeres are considered a marker of biological age — that is, the age of a person’s cells, rather than the individual’s chronological age.
研究人员们观察了这些女性细胞内的遗传物质,尤其是她们端粒的长度。这些位于染色体末端的小帽子能够保护染色体不受损。人们在变老的过程中,端粒也会自然缩短,但这个结构在每个人身上变短的速度均不同。一个人的端粒越长,他们的细胞理论上能够分裂的次数就越多。并且,端粒也被科学家们视为生理年龄的标记,即一个人的细胞年龄,而不是他们的实际年龄。
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