A Study on the Changes of the Biological Rhythm by Display Image Modulation

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Samsung Medical Center

Status

Completed

Conditions

Circadian Rhythm Phase Shift

Treatments

Device: smartphone display

Study type

Interventional

Funder types

Other

Identifiers

NCT02690311
2013-08-072

Details and patient eligibility

About

Effects of Smartphone Use at Night with Light Emitting Diode Display With and Without Blue Light in Healthy Adults: A Randomized, Double-blind, Cross-over, Placebo-controlled Comparison

Enrollment

22 patients

Sex

Male

Ages

20 to 40 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

(1) Healthy males 20-40 years of age who understood the study procedure and agreed to participate after being fully informed about the study were included.

Exclusion criteria

  1. psychiatric diseases according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria;15
  2. cognitive or neurological disorders;
  3. alcohol or substance abuse;
  4. unstable or serious medical illness;
  5. current use of psychoactive mediations including antidepressants, anxiolytics, neuroleptics, anticonvulsants, hypnotics, or stimulant medications;
  6. primary sleep disorder;
  7. habitual sleep onset earlier than 21:00 or later than 24:00;
  8. shift worker;
  9. travel across more than two time zones within 90 days of the study; and
  10. ophthalmologic disease during the study period.

Trial design

Primary purpose

Screening

Allocation

Randomized

Interventional model

Crossover Assignment

Masking

Quadruple Blind

22 participants in 2 patient groups

LED with bluelight
Sham Comparator group
Description:
Two types of smartphone were used. One type had a conventional LED display with the full range of blue light. The LED in the other type newly developed by Samsung Display was suppressed for the blue light portion of the spectrum (wavelength 450 ~ 470 nm). The smartphones were indistinguishable from each other with the naked eye, because other wavelengths mimicked blue light in the suppressed LED.
Treatment:
Device: smartphone display
LED without bluelight
Experimental group
Description:
Two types of smartphone were used. One type had a conventional LED display with the full range of blue light. The LED in the other type newly developed by Samsung Display was suppressed for the blue light portion of the spectrum (wavelength 450 ~ 470 nm). The smartphones were indistinguishable from each other with the naked eye, because other wavelengths mimicked blue light in the suppressed LED.
Treatment:
Device: smartphone display

Trial contacts and locations

0

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Data sourced from clinicaltrials.gov

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