Intermittent bright light and exercise to entrain human circadian rhythms to night work

Intermittent bright light produced significant phase delays in circadian rhythms for 94% of subjects.

• Bright light exposure resulted in larger phase delays in circadian rhythms compared to dim light.
• The phase marker measured was the lowest rectal temperature, indicating circadian rhythm shifts.
• Exercise did not influence the phase shifts caused by bright light.
• Intermittent bright light helped align the circadian temperature minimum with daytime sleep.
• The study involved 33 subjects during a simulated night work schedule with specific light and exercise conditions.

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