Testing the effects of residing in an evening blue-depleted hospital light environment

Not Applicable

Completed

• Conditions: Healthy individuals; Not Applicable

• Registration Number: ISRCTN12419665
• Lead Sponsor: orwegian University of Science and Technology

Brief Summary

2021 Results article in https://pubmed.ncbi.nlm.nih.gov/32954412/ (added 27/09/2021) 2019 Protocol article in https://pubmed.ncbi.nlm.nih.gov/31370871/ (added 04/01/2024)

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Completion: 2017-10-06
• Study Start: 2018-12-17
• Last Update Posted: 15 January 2024

Recruitment & Eligibility

• Status: Completed
• Sex: All
• Target Recruitment: 12

Inclusion Criteria

1. Age 20-30 years
2. No evidence of circadian dysrhythmia (defined as a self-reported bed-time of about 2300h/2400h and rise-time of about 0700h/0800h and <2 hours variation in bed-time and rise-time between weekdays and weekends
3. Normal color vision
4. No known physical or mental disorder
5. No known family history of severe mental disorder (e.g. unipolar, bipolar, psychotic disorders, etc)
6. Not currently being prescribed any medication

Exclusion Criteria

1. Score on the Morningness-Eveningness Questionnaire (MEQ) that indicates that the individual has an extreme morning or evening chronotype
2. Not fluent in Norwegian

Study & Design

• Study Type: Interventional
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Melatonin levels assessed using saliva samples: Timing of Dim Light Melatonin Onset (DLMO) after 5 days residency in each ward as compared to baseline; melatonin levels on the 5th evening in each condition compared to melatonin levels in dim light on the 6th evening (melatonin suppression)