快猫短视频

Watch out sisters: the pheromones of breastfeeding mothers may be messing
with your menstrual cycle.

Two years ago Martha McClintlock of the University of Chicago showed that
women who live at close quarters really do tend to synchronise their menstrual
cycles, backing the popular perception with hard evidence
(快猫短视频, 14 March 1998, p. 6).
Now her team has found that lactating mothers can also influence other women

The researchers asked 26 breastfeeding women to wear absorbent pads in their armpits
and inside their nursing bras. They then asked 54 female volunteers to rub these pads
under their noses four times a day for about two months. After the volunteers鈥�
first menstrual cycle, half the women got got pads collected from nursing mothers.

All the women had regular cycles before the experiment began. But the researchers
found that among the women who sampled 鈥渆au de breast鈥�, short cycles became significantly
shorter and long cycles became significantly longer. 鈥淪ome kind of chemosignal from the
breastfeeding environment is disrupting their cycles,鈥� says Natasha Spencer, a member
of the team.

McClintlock鈥檚 team now wants to find out if the timing of pregnancies of groups of women
can be synchronised by a chemical signal.