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]

hibernation

/hi·ber·na·tion/ (hi″ber-na´shun)
1. the dormant state in which certain animals pass the winter, marked by narcosis and by sharp reduction in body temperature and metabolism.
2. an analogous temporary reduction in function, such as of an organ.

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.
myocardial hibernation  chronic but potentially reversible cardiac dysfunction caused by chronic myocardial ischemia, persisting at least until blood flow is restored.

hibernation

[hī′bərnā′shun]
Etymology: L, hibernare, to winter
a natural physiological state or process wherein a generalized slowdown in metabolic and body functions produces a somnolescent condition and in which body temperature is maintained at a lower level than normal. It is a survival mechanism used by some species of birds and mammals to cope with periods of low temperature and reduced food supply.
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).

hibernation

the dormant state in which certain animals pass the winter, marked by narcosis and by 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. Induced hypothermia has had experimental use as an anesthetic medium for extensive surgical operations in humans.
References in periodicals archive ?
Post hibernation, the bears did not return to their active metabolic activity for two to three full weeks, the team found.
ien and his team continued to monitor the bears' metabolism for another month after their hibernation and determined that the bears did not return to their active metabolic activity for two to three full weeks.
Many frogs and toads burrow individually in hibernation.
The major energy stores of reptiles and amphibians are glycogen and lipids; the reduction or depletion of lipids during hibernation is accompanied by decreases in glycogen stores, and the inadequate hibernaculum conditions may result in extra energy consumption (Derickson, 1976; Jackson and Ultsch, 2010).
During the time between now and its next hibernation the craft is expected to continue its travel out to the KBO and also get its instruments ready or trained to make observations and measurements for once it arrives.
Temperature appears to be the best exogenous predictor of the activity level and course of hibernation, the percentage of nights on which activity occurs during hibernation increasing with increasing temperature (Berkova & Zukal 2010).
But during hibernation, the bear's body recycles its waste instead, so the bear doesn't have to pee.
Indeed, torpor and hibernation are associated with slowing ageing processes and increase of longevity.
20 ( ANI ): Endangered Himalayan black bears are being given special treatment at a rehabilitation centre set up by wildlife authorities, as their hibernation period has begun in Jammu and Kashmir.
This release includes Fresh Hop Pale Ale, Oak Aged Yeti Imperial Stout, and Hibernation Ale.
Hibernation has been intensively studied in ground-dwelling squirrels (family Sciuridae) within the tribe Marmotini.