In summer, an American black bear's heart beats around 55 times a minute. Deep in hibernation it can...
SCIENCE
July 22, 2026
A black bear's heart drops from roughly 55 beats per minute to as few as 8 during hibernation, yet it emerges in spring with almost no muscle or bone loss: a biological trick space agencies are studying to protect astronauts on long missions
In summer, an American black bear's heart beats around 55 times a minute. Deep in hibernation it can fall to as few as nine, with the better part of a...
In summer, an American black bear's heart beats around 55 times a minute. Deep in hibernation it can fall to as few as nine, with the better part of a...
Author: Space Daily
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