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      Ultradian Rhythms in Hydromineral Hormones

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          The maintenance of hydromineral homeostasis depends on the coordinated action of arginine vasopressin (AVP), atrial natriuretic peptide (ANP), the renin-angiotensin-aldosterone system and other recently identified endocrine or paracrine hormones. Several reports have pointed out the changes in urinary excretion and osmolality during the sleep-wake cycle and the rapid eye movement (REM)-non(N)REM sleep cycles. No such changes occur for ANP levels which have a flat profile over 24 h. The pulsatile fluctuations of AVP are described as random. The ultradian rhythm of plasma renin activity (PRA) depends on the regularity of the REM-NREM sleep cycles and the nocturnal curves reflect all disturbances in the internal sleep structure. A study with a shift in the normal sleep time clearly demonstrated that both PRA and aldosterone oscillations are sleep-stage dependent. These hormones could account for the ultradian variations in renal function. The nocturnal oscillations in sympathovagal balance may play an additional role. It is suggested that a central generator synchronizes endocrine, renal, autonomic and sleep processes.

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          Lack of diurnal rhythm in plasma atrial natriuretic peptide


            Author and article information

            Horm Res Paediatr
            Hormone Research in Paediatrics
            S. Karger AG
            March 1998
            16 March 1998
            : 49
            : 3-4
            : 131-135
            JE 2105, Faculté de Médecine, Strasbourg, France
            23159 Horm Res 1998;49:131–135
            © 1998 S. Karger AG, Basel

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            Page count
            Figures: 5, References: 18, Pages: 5


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