Systematically Assessing Effects of Colored Light on Humans With a Multi-modal Approach (Substudy 7 of 7)

Exposure to Man-made Visible Light Clinical Trial

Official title:

Systematically Assessing Effects of Colored Light on Humans With a Multi-modal Approach

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT02919137
• Other study ID #: COLOR10_g
• Status: Active, not recruiting
• Phase: N/A
• Start date: June 1, 2022
• Est. completion date: July 31, 2024

Study information

• Verified date: November 2022
• Source: University of Bern
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

NOTE: This is the seventh of in total 7 sub-studies related to the Ethics Committee of the Canton of Bern Ref. No. KEK-BE 2016-00674. This sub-study includes 50 participants and 8 arms, in total 350 participants will be assessed in all 7 sub-studies.

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.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 23
• Est. completion date: July 31, 2024
• Est. primary completion date: September 30, 2022
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 50 Years

Eligibility

Inclusion Criteria:

• Normal color vision

• Right handed

• Written informed consent

Exclusion Criteria:

• Smoking

• 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

Related Conditions & MeSH terms

• Exposure to Man-made Visible Light

Intervention

Other:
• Visible light exposure
Subjects will be exposed to visible colored light for 45 minutes. The visible light will be generated by red-green-blue light emitting diodes light cans.

Locations

Country	Name	City	State
Switzerland	University of Bern, Institute of Complementary Medicine	Bern

Sponsors (1)

Lead Sponsor	Collaborator
University of Bern

Country where clinical trial is conducted

Switzerland, 

References & Publications (2)

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. — View Citation

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. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in cerebral tissue oxygen saturation during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change in cerebral hemoglobin concentration during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change in variables of the heart rate variability during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change in variables of the electro-dermal activity during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change of the blood pressure during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change of the partial pressure of carbon dioxide during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change of the respiration rate during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change of the heart rate during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change of the pulse-respiratory quotient during colored light exposure compared with a baseline and a recovery period	The pulse-respiratory quotient will be calculated as heart rate divided by the respiration rate.	43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Primary	Change of the arterial oxygen saturation during colored light exposure compared with a baseline and a recovery period		43 minutes (8 min baseline, 15 min colored light exposure, 20 min recovery)
Secondary	Change in verbal fluency task performance during exposure to different colors.	A word repetition task will serve as control condition.	1-4 weeks
Secondary	Change in arithmetic task performance during exposure to different colors.	A word repetition task will serve as control condition.	1-4 weeks
Secondary	Difference in brain activity evoked from the verbal fluency task for the different colored light conditions.	A word repetition task will serve as control condition.	1-4 weeks
Secondary	Difference in brain activity evoked from the arithmetic task for the different colored light conditions.	A word repetition task will serve as control condition.	1-4 weeks

External Links

•   Link to further information on the study