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Circadian Phase Setting

Meaning

Circadian Phase Setting, also referred to as chronotype adjustment, is the clinical process of precisely aligning an individual’s internal biological clock, which is governed by the suprachiasmatic nucleus, with the external 24-hour light-dark cycle and their required daily schedule. This critical alignment is achieved through the timed administration of specific environmental cues, scientifically known as zeitgebers, such as controlled light exposure, scheduled meal timing, and patterned physical activity. Optimal phase setting is vital for harmonizing the rhythmic secretion of hormones and the cyclical function of peripheral organs, thereby supporting systemic health.