Gibbens G L, Chard T
Am J Obstet Gynecol. 1976 Sep 15;126(2):243-6. doi: 10.1016/0002-9378(76)90283-0.
Serial blood samples were obtained from 97 women in spontaneous labor, and oxytocin levels were determined by a sensitive and highly specific radioimmunoassay. The following observations were made: (1) The hormone is released in a series of "spurts"; (2) the peak levels achieved are usually 2 to 5 muU per milliliter and never exceed 12.5 muU per milliliter; (3) the frequency of spurt release increases as labor progresses, reaching a maximum in the second stage; (4) the frequency of spurt release is reduced during intravenous infusion of alcohol at levels which produce no obvious effect on uterine activity.
从97名自然分娩的女性身上采集了系列血样，并通过一种灵敏且高度特异的放射免疫测定法测定了催产素水平。得出了以下观察结果：（1）该激素以一系列“脉冲”形式释放；（2）达到的峰值水平通常为每毫升2至5毫微单位，且从未超过每毫升12.5毫微单位；（3）脉冲释放的频率随着产程进展而增加，在第二产程达到最高；（4）在静脉输注酒精期间，脉冲释放频率降低，而此时酒精水平对子宫活动无明显影响。
