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Diurnal Hormone Fluctuation

Meaning

Diurnal Hormone Fluctuation refers to the systematic and predictable changes in the circulating levels of various endocrine messengers that occur over a precise 24-hour period, intrinsically synchronized with the body’s central circadian rhythm. These rhythmic fluctuations are essential for coordinating a wide array of physiological functions, including metabolic rate, sleep-wake transitions, and immune system readiness. Key examples include the early morning surge of cortisol and the nocturnal rise of melatonin.