decreased skeletal muscle fiber size skeletal muscle fiber atrophy MP:0009413 MPheno.ontology acquired diminution of the size of skeletal muscle fibers associated with wasting as from death and reabsorbtion of cells, diminished cellular proliferation, decreased cellular volume, pressure, ischemia, malnutrition, reduced function or malfunction, or hormonal changes; occurs with age, immobilization, weightlessness, malnutrition or denervation skeletal muscle atrophy