title: Diurnal variation of plasma catecholamines and systolic time intervals.
mesh_terms: D002306:Cardiac Volume; D002940:Circadian Rhythm; D003327:Coronary Disease / Q000097:blood / Q000503:physiopathology; D004837:Epinephrine / Q000097:blood*; D006321:Heart / Q000502:physiology*; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D009638:Norepinephrine / Q000097:blood*; D011187:Posture
chemical_list: D009638:Norepinephrine; D004837:Epinephrine