There's something curious in the blood of black bears that allows them to hibernate for seven months a year while still remaining fit and healthy.
from the sheer lack of physical activity. But when a bear emerges from its den at the start of spring, it stretches out a lean and strong body., despite little to no movement, not even to drink or eat, poop or pee.
That might sound crazy at first, but when researchers in Japan took a serum of blood from seven hibernating bears and added it directly to tissue cultures made of human skeletal muscle cells, they noticed a boost to the cells' protein content within 24 hours. "We have indicated that 'some factor' present in hibernating bear serum may regulate protein metabolism in cultured human skeletal muscle cells and contribute to the maintenance of muscle mass,""However, the identification of this 'factor' has not yet been achieved."
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