Systematically Assessing Effects of Colored Light on Humans With a Multi-modal Approach (Substudy 4 of 7)
NCT ID: NCT02919228
Last Updated: 2021-09-17
Study Results
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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COMPLETED
NA
50 participants
INTERVENTIONAL
2017-08-18
2020-01-18
Brief Summary
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General study information: This is a randomized, cross-over, quantitative study, which investigates physiological variables, mood, and affect of healthy participants in response to colored light exposure. The Participants take part in 5-8 arms and are exposed to colored light only, or are additionally asked to solve cognitive tasks during the colored light exposure. Primary aim is to measure the change in several physiological variables, mood, and affect during colored light exposure of 15 or 45 minutes. The risk for the participants is negligible and comparable to the risk during daily life.
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Detailed Description
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Conditions
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Study Design
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RANDOMIZED
CROSSOVER
BASIC_SCIENCE
SINGLE
Study Groups
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Visible light exposure cognitive Red
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to red LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive Orange
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to orange LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive Yellow
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to yellow LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive Green
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to green LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive Cyan
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to cyan LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive Blue
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to blue LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive Violet
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to violet LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Visible light exposure cognitive White
The participants will be tested for cognitive performance (verbal fluency task, arithmetic task, word repetition task) during exposure to white LED light at a fixed illuminance for 15 minutes. The colored light exposure will be preceded by sitting 8 minutes in darkness and followed by sitting 20 minutes in darkness. The participants will additionally perform hyperventilation and hypoventilation tasks.
Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Interventions
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Visible light exposure
Subjects will be exposed to visible colored light for 15 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.
Eligibility Criteria
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Inclusion Criteria
* Right handed
* Written informed consent
Exclusion Criteria
* Any kind of diagnosed sleep disorder or neurological or psychiatric disorder in the last 3 months
* Acute severe traumas
* Chronic diseases with the necessity for medication
* Use of recreational drugs
* Regular intake of medication that would affect the outcome measures
* Regular excessive alcohol use (\> 18 standard units / week)
* Transmeridian travel in the last month (crossed \> 1 time zone border)
* Night shift word during the last month
18 Years
50 Years
ALL
Yes
Sponsors
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University of Bern
OTHER
Responsible Party
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Principal Investigators
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Ursula Wolf, Prof. Dr.
Role: PRINCIPAL_INVESTIGATOR
University of Bern
Locations
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University of Bern, Institute of Complementary Medicine
Bern, , Switzerland
Countries
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References
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Weinzirl J, Wolf M, Nelle M, Heusser P, Wolf U. Colored light and brain and muscle oxygenation. Adv Exp Med Biol. 2012;737:33-6. doi: 10.1007/978-1-4614-1566-4_5. No abstract available.
Weinzirl J, Wolf M, Heusser P, Nelle M, Wolf U. Effects of changes in colored light on brain and calf muscle blood concentration and oxygenation. ScientificWorldJournal. 2011 Jun 9;11:1216-25. doi: 10.1100/tsw.2011.118.
Related Links
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Link to further information on the study
Other Identifiers
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COLOR10_d
Identifier Type: -
Identifier Source: org_study_id
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