Muscle loss ( sarcopenia ) and ageing.
As people grow older their muscle mass declines. There is a loss of muscle mass of 3-5% each decade which accelerates after the age of 60. The causes of this are not known
Prominent aetiological possibilities include altered endocrine function or changes in tissue response to nutrients. It is not clear whether declining physical exercise is cause or effect.
It has been shown that essential amino acid , but not non-essential amino acids stimulates muscle anabolism in the elderly. Whether this is feasible in the elderly or cost effect has yet to be demonstrated
Nutrition Research Reviews (2004) 17, 69-76 Fujita and Volpi.

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