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Post by brobear on Nov 19, 2019 3:48:44 GMT -5
news.yahoo.com/pretty-cool-hibernate-155900179.html It Would Be Pretty Cool to Hibernate. The New York Times reports researchers are exploring ways bear hibernation could change human approaches to healthcare or even space travel. Times fellow Devi Lockwood talked with evolutionary biologists about how bears change most in their fatty tissues—their other tissues like muscle barely change, let alone the level of atrophy or even bedsores that would likely afflict a human who tried it. Scientists said changing levels of genetic activity are likely responsible.
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Post by King Kodiak on Nov 28, 2019 17:28:47 GMT -5
HIBERNATING BEARS (URSIDAE): METABOLIC MAGICIANS OF DEFINITE INTEREST FOR THE NEPHROLOGIST.Muscle loss, osteoporosis, and vascular disease are common in subjects with reduced renal function. Despite intensive research of the underlying risk factors and mechanisms driving these phenotypes, we still lack effective treatment strategies for this underserved patient group. Thus, new approaches are needed to identify effective treatments. We believe that nephrologists could learn much from biomimicry; i.e., studies of nature's models to solve complicated physiological problems and then imitate these fascinating solutions to develop novel interventions. The hibernating bear (Ursidae) should be of specific interest to the nephrologist as they ingest no food or water for months, remaining anuric and immobile, only to awaken with low blood urea nitrogen levels, healthy lean body mass, strong bones, and without evidence for thrombotic complications. Identifying the mechanisms by which bears prevent the development of azotemia, sarcopenia, osteoporosis, and atherosclerosis despite being inactive and anuric could lead to novel interventions for both prevention and treatment of patients with chronic kidney disease.Kidney International advance online EFFECTS OF 6 MONTHS OF BED REST BETWEEN HUMANS AND HIBERNATING BEARSFULL STUDY HERE:
www.researchgate.net/publication/233958138_Hibernating_bears_Ursidae_Metabolic_magicians_of_definite_interest_for_the_nephrologist
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Post by King Kodiak on Jan 1, 2020 10:30:31 GMT -5
Learning from the bears Grizzly bears spend many months in hibernation, but their muscles do not suffer from the lack of movement. In the journal Scientific Reports, a team led by Michael Gotthardt reports on how they manage to do this. The grizzly bears' strategy could help prevent muscle atrophy in humans as well. Full article : www.google.com/amp/s/phys.org/news/2019-12-learning-from-the-bears.amp
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Post by King Kodiak on Apr 27, 2020 9:22:15 GMT -5
Ask a Bear: What if You Have a Cub Due During Hibernation?
Our resident bruin expert answers all your questions in our 'Ask A Bear' column.
Q: What happens to pregnant bears who have a cub due while they’re hibernating? —Sleepy Sally
A: Plot twist: We always have our cubs while we’re hibernating. Crazy, right? Okay, let me blow your mind again: Grizzly cubs are born weighing a single pound each—smaller than most human preemies.
There are a lot of benefits to this system. Baby gets a warm, protected environment to spend its first few months. Mama gets to offload the cub, technically a survival liability, into the world a little sooner. It’s all pretty dialed—provided that mama bear weighs enough when hibernation rolls around. After all, most grizzles use up about 1.6 pounds of fat per day during hibernation. Mama grizzlies need about 2.8. Fortunately, we’ve got a system for that, too.
Let’s talk the bears and the bees. Bear conception works differently from human conception. We tend to get busy around May and June (who doesn’t love a summer fling?), but we don’t actually get “pregnant” until fall. In spring the egg gets fertilized and the cell divides a few times, but then it just hangs out there, waiting to see if the prospective mama gets fat enough to grow and nurse a cub once she stops eating for the winter.
Too scrawny come sleepy time? Our bodies will just ditch the embryo before it implants, letting us survive to try again next year. Conversely, the fatter I get, the more cubs I’ll produce. Get me up to 50 percent bodyfat and, what the hell?
www.google.com/amp/s/www.backpacker.com/.amp/survival/ask-a-bear-what-if-you-have-a-cub-due-in-hibernation
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Post by brobear on Apr 27, 2020 12:57:36 GMT -5
King Kodiak, nice find.
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Post by King Kodiak on Nov 2, 2020 9:16:07 GMT -5
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Post by brobear on Jun 17, 2022 2:01:03 GMT -5
Hibernation Grizzly bears head for hibernation in the fall months in response to food shortages, cold weather, and snow. For many years bears were not considered to be true hibernators. This is because, in comparison to mammals that are considered to be true or deep hibernators, a bear's body temperature remains within twelve degrees of their normal body temperature. Animals considered to be true hibernators have to warm up before they can actually move. For bears, the warmer body temperature allows them to react to danger more quickly. Many scientists now consider bears to be super hibernators. While in hibernation, their respiration decreases to one breath every forty-five seconds and their heart rate drops to between eight and nineteen beats per minute. Their thick pelts keep them warm, and they usually do not need to move around very much. Sometimes a bear will leave their den during the winter, but they generally do not eat, drink, defecate, or urinate during hibernation. Denning for bears in the Greater Yellowstone Ecosystem generally lasts around five months. Occasionally, a bear will use the same den from the last year, but most of the time they will have to dig a new one because spring run-off causes the old one to collapse. Digging a den usually takes from three to seven days, and a den consists of an entrance, a short tunnel, and a sleeping chamber. The entrance and the tunnel are quite small, just big enough for a bear to squeeze through. This is to minimize heat loss.
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Post by brobear on Jun 17, 2022 4:15:44 GMT -5
Hibernation continued... The floor of the den is covered with bedding material such as evergreen boughs or dead leaves and plant parts, depending on what is available in the immediate area. The bedding material has many air pockets which trap heat around the bear to help it keep warm. Pregnant females will usually den first, followed by females with cubs, subadults, and then adult males. Even though bears can mate from May to July, implantation usually does not take place until November or December. Cubs are born in the den in late January or Early February. At this time, they are about eight inches long and are blind and have no hair. These cubs do not hibernate - they sleep next to mom and nurse and grow. By ten weeks of age, they range from ten to twenty pounds. In spring, the grizzlies emerge from their dens when the weather warms up and food is available. In the Greater Yellowstone Ecosystem, this can start in February, and by the end by May, most bears have left their den. Big males usually leave first, followed by solitary females with yearlings or two-year-olds, and then the mama bears with COY ( cubs-of-the-year ) are last to leave the den. Females with COY generally stay in the den area for a few weeks, while all others usually leave within one week.
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Post by brobear on Jun 17, 2022 14:13:02 GMT -5
For bears, winter is one night. _Unknown
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