[Results of a study on the circadian rhythm of catecholamine excretion on normal subjects and those with high excretion levels (author's transl)].

The circadian rhythm of the excretion of the catecholamines and some main metabolites is investigated in five normal subjects and two patients with a high excretion. In the normal subjects there are remarkable differences in the amplitudes of the variables. At high catecholamine excretions these differences seem to disappear.