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

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

22 participants

Study Classification

INTERVENTIONAL

Study Start Date

2013-08-31

Brief Summary

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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

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Detailed Description

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Conditions

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Circadian Rhythm Phase Shift

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

SCREENING

Blinding Strategy

QUADRUPLE

Participants Caregivers Investigators Outcome Assessors

Study Groups

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LED with bluelight

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.

Group Type SHAM_COMPARATOR

smartphone display

Intervention Type DEVICE

LED without bluelight

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.

Group Type EXPERIMENTAL

smartphone display

Intervention Type DEVICE

Interventions

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smartphone display

Intervention Type DEVICE

Eligibility Criteria

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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.

Minimum Eligible Age

20 Years

Maximum Eligible Age

40 Years

Eligible Sex

MALE

Accepts Healthy Volunteers

Yes