From:
Sukie Crandall
Date: 2007-08-28 18:58:26 UTC
Subject: [ferrethealth] Re: Room lighting and spectrum questions??
To: ferrethealth@yahoogroups.com
Chris, Just found and also of possible interest to you:
> J Pineal Res. 2004 Mar;36(2):140-4.
>
> Links
> Differential effects of light wavelength in phase advancing the
> melatonin rhythm.
>
> Wright HR, Lack LC, Kennaway DJ.
> School of Psychology, Flinders University, Adelaide, South
> Australia, Australia.
> 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. Two long wavelengths, 595 nm
> (amber) and 660 nm (red) and three shorter wavelengths, 470 nm
> (blue), 497 nm (blue/green), and 525 nm (green) were compared with
> a no-light control condition. Light was administered via a portable
> light source comprising two light-emitting diodes per eye, with the
> irradiance of each diode set at 65 microW/cm(2). Forty-two
> volunteers participated in up to six conditions resulting in 15 per
> condition. For the active light conditions, a 2-hr light pulse was
> administered from 06:00 hr on two consecutive mornings. Half-hourly
> saliva samples were collected on the evening prior to the first
> light pulse and the evening following the second light pulse. The
> time of melatonin onset was calculated for each night and the
> difference was calculated as a measure of phase advance. The
> shorter wavelengths of 470, 495 and 525 nm showed the greatest
> melatonin onset advances ranging from approximately 40-65 min while
> the longer wavelengths produced no significant phase advance. These
> results strengthen earlier findings that the human circadian system
> is more sensitive to the short wavelengths of light than the longer
> wavelengths.
> Chronobiol Int. 2001 Sep;18(5):801-8.
> Links
> Effect of light wavelength on suppression and phase delay of the
> melatonin rhythm.
>
> Wright HR, Lack LC.
> School of Psychology, Flinders University, Adelaide, South Australia.
> 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). They were
> administered with light-emitting diodes equated for irradiance of
> 130 muW/cm2. Fifteen volunteers participated in all five wavelength
> conditions and a no light control condition, with each condition
> conducted over two consecutive evenings. Half-hourly saliva sam
> ples were collected from 19:00 to 02:00 on night 1 and until 01:00
> on night 2. Light was administered for the experimental conditions
> on the first night only from midnight to 02:00. Percentage
> melatonin suppression on night 1 and dim light melatonin onset
> (DLMO) for each night were calculated. The shorter wavelengths of
> 470, 497, and 525 nm showed the greatest melatonin suppression, 65%
> to 81%. The shorter wavelengths also showed the greatest DLMO delay
> on night 2, ranging from 27 to 36 min. The results were consistent
> with the involvement of a scotopic mechanism in the regulation of
> circadian phase.
There are more, and of course, there are a LOT of past posts
including ones from Dr. Jerry Murray on melatonin and LH in relation
to adrenal disease to be found in the FHL Archives.
Examples of some of those:
http://ferrethealth.org/archive/FHL1843
http://ferrethealth.org/archive/YPG79
http://ferrethealth.org/archive/SG7879
http://ferrethealth.org/archive/SG7005
etc.
I HIGHLY RECOMMEND those past posts and others to be found in such a
search!
Sukie (not a vet)
Recommended ferret health links:
http://pets.groups.yahoo.com/group/ferrethealth/
http://ferrethealth.org/archive/
http://www.afip.org/ferrets/index.html
http://www.miamiferret.org/fhc/
http://www.ferretcongress.org/
http://www.trifl.org/index.shtml
http://homepage.mac.com/sukie/sukiesferretlinks.html
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