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Grizzly bears spend many months in hibernation, but their muscles do not suffer from the lack of movement. The bear’s metabolism and heart rate drop rapidly. It excretes neither urine nor feces. The amount of nitrogen in the blood increases drastically and the bear becomes resistant to the hormone insulin. A person could hardly survive this four-month phase in a healthy state. Afterwards, he or she would most likely have to cope with thromboses or psychological changes. Above all, the muscles would suffer from this prolonged period of disuse. The scientists from Berlin, Greifswald and the United States were particularly…

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