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Effects of day-time exposure to different light intensities on light-induced melatonin suppression at night

Overview of attention for article published in Journal of Physiological Anthropology, July 2015
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  • In the top 25% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (86th percentile)
  • Good Attention Score compared to outputs of the same age and source (66th percentile)

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17 X users
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1 Facebook page

Citations

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104 Mendeley
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Title
Effects of day-time exposure to different light intensities on light-induced melatonin suppression at night
Published in
Journal of Physiological Anthropology, July 2015
DOI 10.1186/s40101-015-0067-1
Pubmed ID
Authors

Tomoaki Kozaki, Ayaka Kubokawa, Ryunosuke Taketomi, Keisuke Hatae

Abstract

Bright nocturnal light has been known to suppress melatonin secretion. However, bright light exposure during the day-time might reduce light-induced melatonin suppression (LIMS) at night. The effective proportion of day-time light to night-time light is unclear; however, only a few studies on accurately controlling both day- and night-time conditions have been conducted. This study aims to evaluate the effect of different day-time light intensities on LIMS. Twelve male subjects between the ages of 19 and 23 years (mean ± S.D., 20.8 ± 1.1) gave informed consent to participate in this study. They were exposed to various light conditions (<10, 100, 300, 900 and 2700 lx) between the hours of 09:00 and 12:00 (day-time light conditions). They were then exposed to bright light (300 lx) again between 01:00 and 02:30 (night-time light exposure). They provided saliva samples before (00:55) and after night-time light exposure (02:30). A one-tailed paired t test yielded significant decrements of melatonin concentration after night-time light exposure under day-time dim, 100- and 300-lx light conditions. No significant differences exist in melatonin concentration between pre- and post-night-time light exposure under day-time 900- and 2700-lx light conditions. Present findings suggest the amount of light exposure needed to prevent LIMS caused by ordinary nocturnal light in individuals who have a general life rhythm (sleep/wake schedule). These findings may be useful in implementing artificial light environments for humans in, for example, hospitals and underground shopping malls.

X Demographics

X Demographics

The data shown below were collected from the profiles of 17 X users who shared this research output. Click here to find out more about how the information was compiled.
Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 104 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Malaysia 1 <1%
Spain 1 <1%
Sweden 1 <1%
Unknown 101 97%

Demographic breakdown

Readers by professional status Count As %
Student > Master 17 16%
Researcher 15 14%
Student > Ph. D. Student 15 14%
Student > Bachelor 14 13%
Other 7 7%
Other 15 14%
Unknown 21 20%
Readers by discipline Count As %
Agricultural and Biological Sciences 19 18%
Neuroscience 10 10%
Engineering 8 8%
Medicine and Dentistry 8 8%
Biochemistry, Genetics and Molecular Biology 5 5%
Other 25 24%
Unknown 29 28%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 12. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 22 June 2023.
All research outputs
#3,120,054
of 25,374,917 outputs
Outputs from Journal of Physiological Anthropology
#83
of 451 outputs
Outputs of similar age
#38,076
of 276,685 outputs
Outputs of similar age from Journal of Physiological Anthropology
#2
of 6 outputs
Altmetric has tracked 25,374,917 research outputs across all sources so far. Compared to these this one has done well and is in the 87th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 451 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 22.4. This one has done well, scoring higher than 81% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 276,685 tracked outputs that were published within six weeks on either side of this one in any source. This one has done well, scoring higher than 86% of its contemporaries.
We're also able to compare this research output to 6 others from the same source and published within six weeks on either side of this one. This one has scored higher than 4 of them.