When is another time when atrophy could occur besides in cases of dmd?

In Cancer disease

Explanation:

Atrophy is a term used to define a reduction in the size of a tissue or organ because of cell shrinkage, which can occur through the loss of organelles, cytoplasm and proteins. Thus, the loss of protein in muscle cells generates muscle atrophy, which can impair several vital metabolic functions.

Muscle atrophy is a loss of muscle mass that can cause serious problems, including difficulty of moving and even breathing properly. This is often due to extreme physical inactivity and other health problems that can result in muscle loss.

Cancer is not a single disease, but a large number of diseases characterized by abnormal cell growth and multiplication.  In several cases of cancer, symptons like cachexia, a condition characterized by weight loss, muscle atrophy, loss of appetite and tiredness are very common in patients.

creating amino acids is the answer

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.