Hibernation secrets of black bears could help humans
Almaty. February 18. Kazakhstan Today - The researchers have studied the range of physiological changes in hibernating black bears and revealed bears' reduced metabolism to 25% of its normal level may be useful in emergency medicine, Kazakhstan Today reports.
Researchers from the University of Alaska Fairbanks and Stanford University say five bears subjected to the most detailed hibernation study ever undertaken in animals of their size remained in a state of reduced metabolism even weeks after awakening, the BBC reported Thursday.
Researchers say the pattern of the bears' heartbeats puzzled them, United Press International said.
"The bears typically during hibernation will take a deep breath and exhale and when they do, their heart stops and doesn't beat at all for 10, 15, 20 seconds," Brian Barnes, the Institute of Arctic Biology researcher who led the study, said.
"They held their breath for about a minute, and it's only when they inhale again that their heart picks up," he said. "It's just this alternative way of being that's very spare, that we didn't know was possible, particularly in large animals."
The research may yield clues that could prove useful in emergency medicine, the researchers said.
"If we could tell the mechanism by which they ... do this decrease in metabolic demand, that would be very interesting; should you have a heart attack or stroke or be gravely injured, the ability of your heart to deliver oxygen to your brain is compromised," Barnes said.
The study's senior author, Brian M. Barnes of the Institute for Arctic Biology at the University of Alaska, noted that after hibernating, black bears don't suffer the loss of bone and muscle mass that occurs in humans after a long period of inactivity, The Associated Press informed.
He said that if scientists could better understand the mechanisms behind the lower metabolic demand, it might be possible to develop new therapies and medicines for people.
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