Light colour and our internal clock

Discussion in 'Biology & Genetics' started by Pinball1970, Dec 22, 2023.

  1. Pinball1970 Valued Senior Member

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    C C likes this.
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  3. DaveC426913 Valued Senior Member

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    The more ya know...
     
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  5. Pinball1970 Valued Senior Member

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    I need to read the previous literature again see where I am before I follow up. I just wanted to get it on before I left work.
     
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  7. Hercules Rockefeller Beatings will continue until morale improves. Moderator

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    There’s certainly no shortage of publications that indicate light intensity and wavelength affect circadian rhythms. But maybe the issue isn’t as clear-cut as it seems. Interestingly, this 2018 systematic review suggests that only 15 out of 128 papers they reviewed on the subject fulfilled their quality criteria; most were excluded due to small sample sizes, narrow cohort diversity, and other factors.

    Leena Tähkämö, Timo Partonen & Anu-Katriina Pesonen (2019) Systematic review of light exposure impact on human circadian rhythm, Chronobiology International, 36:2, 151-170, DOI: 10.1080/07420528.2018.1527773

    https://www.tandfonline.com/action/showCitFormats?doi=10.1080/07420528.2018.1527773

    Their review findings were:

    “A 2-h exposure to light (460 nm) in the evening suppresses melatonin, the maximum melatonin-suppressing effect of light exposure being achieved at the shortest wavelengths (424 nm), but the melatonin concentration recovers rather rapidly, within 15 min from cessation of the exposure. This suggests a short-term or simultaneous impact of the light exposure. In addition, melatonin secretion as well as melatonin suppression were found to reduce with age, but the light-induced phase advance of melatonin circadian rhythm is not impaired with age. The circadian rhythm was found to respond to both morning and evening light exposure (blue-enriched or blue-depleted) without significant differences between morning-types and evening-types of persons (chronotypes).”​
     
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