Effects of Different Colors of Light on Human Physiology

Completed · Not applicable

Conditions studied: Healthy, Circadian Rhythm

In brief

This study will determine which color of light is most effective in stimulating a range of biological functions in humans including activation of sleep-wake regulatory system (alertness, performance, microsleeps, brain activity), activation of the nervous system (heart rate, temperature, blood pressure, breathing rate), and shifting the timing of the internal 24-hour (circadian) pacemaker.

Key facts

Study ID

NCT00200863

Run by

Brigham and Women's Hospital

People needed

47

Starts

2005-04-01

Expected to finish

2007-02-01

Last updated by the study team

2014-08-12

Who can join

Age: 18 and older, up to 30. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Free from any acute, chronic or debilitating medical, psychological, or ophthalmological conditions
• Drug-free (including caffeine, nicotine, and alcohol) for entire study duration

You may not qualify if…

• History of drug or alcohol dependency
• History of psychiatric illnesses or evidence of psychopathology according to standardized questionnaires, or in a structured clinical interview
• Night shift work during the past 3 years
• Transmeridian travel in the last 3 months

Where it is running

• Division of Sleep Medicine, Brigham and Women's Hospital — Boston, Massachusetts, United States

Full record on ClinicalTrials.gov

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