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Short winter days make women aggressive?

Sentinel Digital DeskBy : Sentinel Digital Desk

  |  19 Nov 2015 12:00 AM GMT

New York, November 18: Now you know why your spouse or girlfriend suddenly gets hostile towards you as winter settles in. According to fasciting research, a hormol mechanism may trigger aggression in females — and not males — during short winter days.

The hormone called melatonin acts directly on the adrel glands in females to trigger a “seasol aggression switch” from hormones in the gods to hormones in the adrel glands — a major contrast to how this mechanism works in males,” explained Nikki Rendon, PhD student of biology from India University.

The work on hamsters (rodents), which advances basic knowledge about the connection between certain sex hormones and aggression, could go on to advance research on the treatment of ippropriate aggression in humans.

“This study reveals a ripe area for research,” Rendon added. Melatonin is a hormone that rises in the body during darkness and lowers during daylight. The hormone released from the adrel gland is called DHEA - a sex steroid shown to affect aggression levels in mammals and birds and possibly humans. Professiol sports competitions have banned the use of DHEA in athletes. Rendon and colleagues found that melatonin acts directly on the adrel glands in females to trigger the release of DHEA, without the need for the pituitary hormone. DHEA can be converted to androgens and estrogens, which affect aggression in both males and females.

In females, DHEA appears to compensate for low levels of estradiol — a form of estrogen — that occurs during the winter. The research was conducted on Siberian hamsters, a species with an adrel system similar to humans.

About 130 hamsters were exposed to long days for a week, after which 45 were exposed to shorter days for 10 weeks. The female hamsters exposed to shorter days had increased levels of both melatonin and DHEA — and higher aggression scores — along with physical changes in their adrel glands. (IANS)


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