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

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

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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