Lack, L, Bramwell, T, Wright, H & Kemp, K, ‘Morning blue light can advance the melatonin rhythm in mild delayed sleep phase syndrome’, Sleep and Biological Rhythms 2007, 5: 78–80
Objective We investigated the effectiveness of morning blue light in advancing the sleep and melatonin rhythm of individuals with mild delayed sleep phase syndrome. Method The 18 participants were randomly allocated to a light or control group. Wake-up times were gradually advanced to 06.00 over a week, during which the light group also received two […]
Wright, HR, Lack, LC & Kennaway, DJ, ‘Differential effects of light wavelength in phase advancing the melatonin rhythm’, Journal of Pineal Research, 2004, 36:140–144
Objective Shorter wavelength light has been shown to be more effective than longer wavelengths in suppressing nocturnal melatonin and phase-delaying the melatonin rhythm. In the present study, different wavelengths of light were evaluated for their capacity to phase advance the saliva melatonin rhythm. Method Light was administered via a portable light source comprising two light-emitting […]
Wright HR, Lack LC, ‘Effect of light wavelength on suppression and phase delay of the melatonin rhythm’, Chronobiology International, 2001 Sept., 18 (5): 801–8
Objective Different wavelengths of light were compared for melatonin suppression and phase shifting of the salivary melatonin rhythm. The wavelengths compared were 660 nm (red), 595 nm (amber), 525 nm (green), 497 nm (blue/green), and 470 nm (blue). Method Volunteers were administered with light-emitting diodes equated for irradiance of 130 muW/cm2. Fifteen volunteers participated in […]
Wright HR, Lack LC & Partridge KJ, ‘Light emitting diodes can be used to phase delay the melatonin rhythm’, Journal of Pineal Research, 2001, 31:350–355
Objective The aim of this study was to compare the effect of a portable light source with that of a conventional light box in suppressing nocturnal salivary melatonin and phase shifting dim light melatonin onset (DLMO), a phase marker of the circadian system [Lewy and Sack 1989]. Method Two portable light sources, comprising light-emitting diodes […]