hibernation


Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia, Wikipedia.

hibernation

 [hi″ber-na´shun]
a dormant state in which certain animals pass the winter, marked by deep sleep and sharp reduction in body temperature and metabolism.
artificial hibernation a state of reduced metabolism, muscle relaxation, and a twilight sleep resembling narcosis, produced by controlled inhibition of the sympathetic nervous system and causing attenuation of the homeostatic reactions of the organism.

hi·ber·na·tion

(hī'bĕr-nā'shŭn),
A torpid condition in which certain animals pass the cold months. True hibernators, such as woodchucks, ground squirrels, dormice, and some others, have body temperatures reduced to near the freezing point, with a very slow heartbeat, low metabolism, and infrequent respirations. Partial hibernators, such as bears, skunks, and raccoons, have reduced physiologic activity during the cold months, but they are not comatose. Compare: estivation.
Synonym(s): winter sleep
[L. hibernus, relating to winter]
Cardiology Myocardial hibernation
Physiology Astate of winter dormancy and hypothermia seen in bears and other animals

hi·ber·na·tion

(hī'bĕr-nā'shŭn)
A torpid condition in which some animal species pass the cold months.
Compare: estivation
Synonym(s): winter sleep.
[L. hibernus, relating to winter]

hibernation

a state of dormancy entered into by many animals during the winter, particularly those in cooler latitudes. Some temperate and arctic mammals, reptiles and some amphibians hibernate and, in this state, the METABOLISM is slowed down and the body temperature falls. Hibernation is generally triggered by cold weather and whilst body temperatures in mammals normally are maintained at the usual level, they may fall much lower and near to freezing point (in e.g. hamster), or to that of the surroundings (in e.g. bat).

True hibernators tend to be mid-sized animals as these can have sufficient food reserves without too large a surface area for heat loss. Bears are not true hibernators as their body temperature does not drop and they are able to awake from their winter ‘sleep’ very quickly. In temperate situations, rises in temperature may cause some animals temporarily to come out of hibernation. Compare AESTIVATION (1).

References in periodicals archive ?
"By understanding the biology of cold adaptation in hibernation, we may be able to improve and broaden the applications of induced hypothermia in the future, and perhaps prolong the viability of organs prior to transplantation," Li posits.
Sixty five individuals (70 %) were successfully located during the subsequent hibernation period; 33 male and 32 female (Table 1).
The project was disrupted, prompting the agency to place it on hibernation and prepare for downloading the scientific data the spacecraft had collected.
Hibernation is not as common among mammals as many people assume.
Hibernation turns a warm-blooded hedgehog into what is, for all intents and purposes, a coldblooded animal.
In northern latitudes, poikilotherms must remain below frost line in addition to having cold-adaptive strategies during hibernation. Several studies have found box turtles can regulate body temperature in hibernacula by actively adjusting their depth to maximize heat exposure and to minimize freezing during hibernation (Carpenter 1957, do Amaral et al.
This crowdfunding project's goal is to release Hibernation, Jesse Terrance Daniels' first product in a pursuit to create a game making company titled Pied Raven Games.
Contrary to many adorable children's stories, hibernation is so not sleeping.
This could be a great one to make into a story sack, with many opportunities to link into study of the seasons, wildlife and hibernation. There is also a subtle message about stranger danger, but this can just be enjoyed as a sweet, comforting story about the joy of being home.