sarcopenia. muscle atrophy

sarcopenia muscle atrophy comparison aging immobility difference healthy adult arm cross young active person old passive human vector strength elderly muscular growth hormone dystrophy disease mobility training myopathy skeletal medical obesity weight disorder degeneration weakness senior damage neuropathy osteoarthritis rheumatoid sclerosis therapy syndrome older amyotrophic people disability disuse loss arthritis neurodegenerative hypertrophy exercise wasting examination diabetes myopenia alcoholic