[Circadian rhythms in man. Their incidence in endocrinology (author's transl)]

The authors, after a classification of the main biological rhythms, mention the parameters of the circadian rhythm deduced by mathematical analysis of so-called "Cosinor". They then devote their study to the main hormones, the secretion of which depends on circadian periodicity. They emphasize the effect that their biorhythm has on the value of plasma concentrations depending on the time of sampling. They suggest standardisation of this time in drawing up international norms.