Fukuda Misao, Fukuda Kiyomi
M&K Health Institute, 30-9 Kariya, Ako, Hyogo 678-0239, Japan.
M&K Health Institute, 30-9 Kariya, Ako, Hyogo 678-0239, Japan.
Early Hum Dev. 2020 Jan;140:104861. doi: 10.1016/j.earlhumdev.2019.104861. Epub 2019 Oct 22.
We have updated our work regarding climate extremes in Japan and the consequences of the huge earthquake in the Fukushima Prefecture in year 2011. We have interchangeably used the term sex ratio at birth, sex ratio of births. This ratio describes the secondary sex ratio, whereas the primary sex ratio designates the male/female ratio at fertilization. The underlying mechanisms of declines in sex ratios at birth may be related to decreased fertilization of XY embryos by reduced motility of Y spermatozoa from male factor approach and increased cortisol secretion prior to conception from a female factor approach. We have shown that the declines in sex ratio at birth were observed 9 months after the Kobe earthquake but 10 months after the Tohoku and Kumamoto earthquakes. The temperature difference may be associated positively with sex ratio of fetal deaths and negatively with sex ratio of births and with singleton male and female birth weights.
我们更新了关于日本极端气候以及2011年福岛县大地震后果的研究工作。我们交替使用了出生性别比、出生时的性别比这两个术语。这个比率描述的是次生性别比，而初生性别比指的是受精时的男女比例。出生性别比下降的潜在机制可能与男性因素导致的Y精子活力降低致使XY胚胎受精减少以及女性因素导致的受孕前皮质醇分泌增加有关。我们已经表明，神户地震后9个月出现了出生性别比下降的情况，但东北地震和熊本地震后则是10个月出现下降。温差可能与死胎性别比呈正相关，与出生性别比以及单胎男女生体重呈负相关。
