Circadian variation in plasma dopamine levels in man

Abstract
Nocturnal and daytime recumbent secretory patterns of norepinephrine, epinephrine and dopamine were determined at 30 min intervals in 9 normotensive males. Plasma levels of dopamine as well as those of norepinephrine and epinephrine followed a circadian pattern in these recumbent males. Plasma levels of dopamine were more closely related to clock time (r = -0.54, p