Green Light Exposure Can Reset Body Clock As Well

Exposure to green brightness can reset the body’s internal clock and alter sleep-related hormonal responses, new research suggests.

The finding, reported in the May 12 concern of Science Translational Medicine, stems from investigation carried out by a team of scientists at Brigham and Women’s Hospital in Boston, and builds on prior investigation about how the eye handles brightness subjection in ways that are unrelated to vision.

So-called “non-visual responses” had previously been linked to blue brightness subjection, the research authors noted.

In this regard, the eye’s photoreceptor system located within the eye’s ganglion cell layer, and unique in the component of the eye responsible for processing sight, had been identified as a center for special cells that detect and absorb azure brightness, thereby triggering a shift within the viewer’s internal circadian body clock.

Azure light subjection had also previously been found to prompt elevated alertness by suppressing the sleep-inducing hormone melatonin.

The study authors note that such observations have led to the harnessing of blue brightness for all kinds of therapeutic remedies targeting a variety of circadian rhythm rest disorders, too as seasonal affective condition.

Inside a news release from the hospital, lead researcher Steven Lockley mentioned: “Over the past decade there have been numerous non-FDA approved devices and technologies marketed for using blue light therapeutically, such as azure light boxes for treatment of seasonal affective disorder and circadian rhythm sleep condition, and glasses that block azure brightness from reaching the eye. Our outcomes suggest that we have to consider not only blue brightness when predicting the outcomes of brightness on our circadian rhythms, hormones and alertness, but additionally other visible wavelengths for example green brightness.”

The finding was dependent on the nine-day research with 52 wholesome volunteers, who had been exposed to 6.5 hours per day time of either green or blue brightness after becoming placed on the wake-sleep schedule that mimicked overnight shift work. The experiment was conducted in a setting stripped of all cues that may indicate time of day time.

The investigation team discovered that blue light appeared to most readily stimulate changes in melatonin levels and circadian clock rhythms. Nevertheless, green brightness was also found to become capable of provoking non-visual responses to light exposure, although the responses were not usually as long-lasting.

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