Effect of exposure duration and light spectra on nighttime melatonin suppression in adolescents and adults
Open accessAbstract
This study investigated how light exposure duration affects melatonin suppression, a well-established marker of circadian phase, and whether adolescents (13–18 years) are more sensitive to short-wavelength (blue) light than adults (32–51 years). Twenty-four participants (12 adolescents, 12 adults) were exposed to three lighting conditions during successive 4-h study nights that were separated by at least one week. In addition to a dim light (<5 lux) control, participants were exposed to two light spectra (warm (2700 K) and cool (5600 K)) delivering a circadian stimulus of 0.25 at eye level. Repeated measures analysis of variance revealed a significant main effect of exposure duration, indicating that a longer duration exposure suppressed melatonin to a greater degree. The analysis further revealed a significant main effect of spectrum and a significant interaction between spectrum and participant age. For the adolescents, but not the adults, melatonin suppression was significantly greater after exposure to the 5600 K intervention (43%) compared to the 2700 K intervention (29%), suggesting an increased sensitivity to short-wavelength radiation. These results will be used to extend the model of human circadian phototransduction to incorporate factors such as exposure duration and participant age to better predict effective circadian stimulus.
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It has been shown earlier in healthy volunteers that treatment with similar conditions as the placebo therapy might actually have some effects in melatonin suppression.
“Finally, it has been shown earlier in healthy volunteers that treatment with similar conditions as our placebo therapy might actually have some effects in melatonin suppression,79”
From Effects of bright light therapy for depression during pregnancy: a randomised, double-blind controlled trial (2020) · cites this paper as [79]
The Results report melatonin suppression during nighttime light exposure, and Materials and methods (§2.2) describes warm and cool light interventions alongside a dim-light control. The source therefore supports the possibility that light exposure can suppress melatonin, but the citing sentence gives no details of its placebo therapy, so our copy cannot establish that the study used similar conditions. (LLM, conf=0.81)
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- Authors
- Nagare, R., Plitnick, B., & Figueiro, M.
- Affiliations
- Rensselaer Polytechnic Institute (US)
- Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY, USA
- Venue
- Lighting Research & Technology
- Publisher
- SAGE Publications
- Published
- 2018-03-14
- Volume
- 51
- Issue
- 4
- Pages
- 530-543
- ISSN
- 0024-3426 (ISSN-L)
- 1477-1535
- 1477-0938
- PMC
- PMC6561500
- OpenAlex
- W2789750465
- Cited by
- 85
- References
- 61
- Citations by year
- 2026: 6 · 2025: 14 · 2024: 10 · 2023: 12 · 2022: 13 · 2021: 11 · 2020: 10 · 2019: 9
- FWCI
- 4.22
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Lighting Research & Technology (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Lighting Research Center's Light and Health Alliance (n/a)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Physical Sciences › Environmental Science › Global and Planetary Change › Impact of Light on Environment and Health
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Keywords
- melatonin suppression, circadian phase, light duration, light spectrum, blue light, short-wavelength radiation, adolescents, age differences, circadian stimulus, circadian phototransduction, dim light exposure
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