Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Jefferson and Brigham and Women’s Researchers Find Blue Light Important for Setting Biological Clock

11.09.2003


Researchers from Brigham and Women’s Hospital (BWH) in Boston and Jefferson Medical College have found that the body’s natural biological clock is more sensitive to shorter wavelength blue light than it is to the longer wavelength green light, which is needed to see.



The discovery proves what scientists have suspected over the last decade: a second, non-visual photoreceptor system drives the body’s internal clock, which sets sleep patterns and other physiological and behavioral functions.

“This discovery will have an immediate impact on the therapeutic use of light for treating winter depression and circadian disorders,” says George Brainard, Ph.D., professor of neurology at Jefferson Medical College of Thomas Jefferson University in Philadelphia. “Some makers of light therapy equipment are developing prototypes with enhanced blue light stimuli.”


“In the long range, we think this will shape all artificial lighting, whether it’s used for therapeutic purposes, or for normal illumination of workplaces, hospitals or homes – this is where the impact will be,” he says. “Broad changes in general architectural lighting may take years, but the groundwork has been laid.”

In theory, he says, “If a clinician wants to use light therapeutically, the blue wavelengths may be more effective. If you wanted built-in illumination that would enhance circadian regulation, you might want this wavelength region emphasized. It is interesting that natural daylight – the blue sky – is rich in this part of the spectrum.”

Dr. Brainard and his co-workers previously discovered that wavelengths of light in the blue region of the visible spectrum are the most effective in controlling the production of melatonin, which plays an important role in the body’s circadian rhythms.

The scientists reported their findings September 9 in the Journal of Clinical Endocrinology and Metabolism.

In the study, researchers tested 16 healthy subjects, exposing them to the same amount of blue or green light. They measured the effect of the light exposure on the timing of their biological rhythms. The researchers found that blue light was twice as effective as the same amount of green light at resetting the internal biological clock. Dr. Brainard, who is also associate team leader for the Human Performance Factors, Sleep and Chronobiology Team of the National Space Biomedical Research Institute, sees the work as having potential impact on sleep disorders involving space travel. Sleep disorders are extremely common, affecting as many as 40 million Americans.

Steve Benowitz | TJUH
Further information:
http://www.jeffersonhospital.org/news/e3front.dll?durki=17015

More articles from Life Sciences:

nachricht New risk factors for anxiety disorders
24.02.2017 | Julius-Maximilians-Universität Würzburg

nachricht Stingless bees have their nests protected by soldiers
24.02.2017 | Johannes Gutenberg-Universität Mainz

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>