publication . Article . Other literature type . 2011

Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance

Christian Cajochen; Sylvia Frey; Doreen Anders; Jakub Späti; Matthias Bues; Achim Pross; Ralph Mager; Anna Wirz-Justice; Oliver Stefani;
  • Published: 01 May 2011
  • Publisher: American Physiological Society
  • Country: Germany
Abstract
<jats:p> Many people spend an increasing amount of time in front of computer screens equipped with light-emitting diodes (LED) with a short wavelength (blue range). Thus we investigated the repercussions on melatonin (a marker of the circadian clock), alertness, and cognitive performance levels in 13 young male volunteers under controlled laboratory conditions in a balanced crossover design. A 5-h evening exposure to a white LED-backlit screen with more than twice as much 464 nm light emission {irradiance of 0,241 Watt/(steradian × m<jats:sup>2</jats:sup>) [W/(sr × m<jats:sup>2</jats:sup>)], 2.1 × 10<jats:sup>13</jats:sup> photons/(cm<jats:sup>2</jats:sup> × s),...
Subjects
free text keywords: Chemistry, Optics, business.industry, business, Evening, Backlight, Light-emitting diode, law.invention, law, Diode, Spectral analysis, Circadian rhythm
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publication . Article . Other literature type . 2011

Evening exposure to a light-emitting diodes (LED)-backlit computer screen affects circadian physiology and cognitive performance

Christian Cajochen; Sylvia Frey; Doreen Anders; Jakub Späti; Matthias Bues; Achim Pross; Ralph Mager; Anna Wirz-Justice; Oliver Stefani;