normal , diabetic , and sympathectomized rats were killed at intervals during a 12 h light ( 6 a.m. to 6 p.m. ) /12 h dark cycle to determine ( 1 ) the patterns of diurnal glycogen rhythms in skeletal muscle fibre types , and ( 2 ) if the absence of insulin or the catecholamines epinephrine and norepinephrine abolished these rhythms .
C0007412
catecholamines
C0028351
norepinephrine