What is the Origin of Phase Shifting Correction?

This terminology is a core concept within chronotherapy and sleep medicine, drawing from the understanding of how the body's master clock responds to external stimuli. The term "phase shifting" describes the change in the timing of the rhythm's peaks and troughs. "Correction" denotes the therapeutic goal of restoring alignment between the internal clock and the external environment.

What is the Mechanism of Phase Shifting Correction?

The correction is achieved by precisely timing the exposure to powerful zeitgebers, primarily bright light and melatonin administration, relative to the individual's current core body temperature nadir. Exposure to light immediately after the nadir causes a phase advance, while exposure just before the nadir causes a phase delay. Melatonin administration acts as a dark signal, having the opposite phase-shifting effect to light at different times of the day.

Phase Shifting Correction ∞ Area

Phase Shifting Correction

Meaning

Phase Shifting Correction is a clinical intervention specifically designed to deliberately adjust the timing, or phase angle, of an individual’s endogenous circadian rhythm to align with a desired sleep-wake schedule or external time zone. This is distinct from simply inducing sleep, as it involves resetting the master biological clock to a new temporal reference point. Successful correction is critical for treating Delayed or Advanced Sleep Phase Disorders and minimizing the effects of jet lag.