Hunger hormone and sleep responses to the built-in blue-light filter on an electronic device: a pilot study
The aim of the current study was to investigate the effect of the blue-light filtering ‘Night Shift’ function on the Apple iPad at night and leptin production, perceived hunger levels and markers of sleep quality and quantity in healthy young adults. In a randomised, crossove...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Thieme Revinter Publicações Ltda.
2019-09-01
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| Series: | Sleep Science |
| Subjects: | |
| Online Access: | http://sleepscience.org.br/export-pdf/646/ssci-12-03-0171.pdf |
| Summary: | The aim of the current study was to investigate the effect of the blue-light filtering ‘Night Shift’
function on the Apple iPad at night and leptin production, perceived hunger levels and markers
of sleep quality and quantity in healthy young adults. In a randomised, crossover design, 13 young
adults (6 male/7 female) performed three experimental trials. Two of the interventions included
one hour of night-time electronic device use; reading on an iPad ~30 cm from eyes, either with
(iPad+NS) or without (iPad) the ‘Night Shift’ blue-light filtering feature turned on. The control trial
involved reading a hard-copy book for one hour (CON). Leptin and perceived hunger and tiredness
levels were assessed at various time points for the three experimental conditions. Objective sleep
indices (actigraphy) and subjective ratings of sleep were recorded. There were no significant interactions
for any of the measured variables (p > 0.05). Small to moderate effect sizes were found for
perceived sleep quality, with CON (7.3 ± 1.7) having the highest value when compared to iPad+NS
(6.6 ± 1.8, d = 0.29) and iPad (5.6 ± 2.3, d = 0.66). Moderate effects were associated with iPad+NS
when compared to iPad (d = 0.77) and for iPad compared to CON (d = 0.90) for pre-post change
in leptin concentration. Use of electronic devices at night may result in moderate suppression of
leptin levels and impaired sleep quality, with negligible differences associated with whether or not
the ‘Night Shift’ feature is turned on. |
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| ISSN: | 1984-0659 1984-0063 |