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Do healthy humans have muscle atrophy without knowing?

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I think that your assumption that other animals (humans are animals after all) do not experience muscle atrophy is incorrect. There are extensive examples and peer-reviewed research about the effect of animals living in captivity. read more

There are three way humans lose muscle strength (atrophy). 1. Aging. (see Jon Ng answer below). 2. Disuse. Basically, use it or lose it. 3. Injury. Following injury or surgery, muscles atrophy. Only if you test the muscle strength will you know there has been atrophy. Lots of muscle needs to go away before you can see it visually. read more

Humans can easily go without food for extended periods of time and simply burn their body fat rather than their muscles. So there you have it, all animals, including humans will experience muscle atrophy from disease or lack of use except for during hibernation or true starvation where they will use fat as energy. read more

Loss of mass. atrophy refers to loss of muscle mass, which will appear as a shrinking of the muscle. It is specially noticeable when in one limb. Whether or not it causes weakness depends on the amount of muscle lost. atrophy due to under use can occur in the back. read more

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