Does changing lighting fixtures improve the impact of night shifts on shift workers?

UMIN ID: UMIN000054633

Registered date:12/06/2024

Basic Information

• Recruitment status: Recruiting
• Health condition(s) or Problem(s) studied: Circadian rhythm sleep disorder
• Date of first enrollment: 2024/06/12
• Target sample size: 20
• Countries of recruitment: Japan
• Study type: Interventional

Intervention(s)

Group A research participant work for four weeks in an environment with daylight-white LEDs, followed by four weeks in an environment with new LEDs. They then work again for four weeks in an environment with daylight-white LEDs.
Group B research participants work for four weeks in an environment with daylight-white LEDs, followed by four weeks in an environment with lightbulb-coloured LEDs. They then work again for four weeks in an environment with daylight-white LEDs.

Outcome(s)

• Primary Outcome: Melatonin concentration
• Secondary Outcome: a. cortisol concentration in hair b. Melatonin concentration in blood c. Melatonin concentration in saliva d. Diurnal rhythm of deep body temperature e. Sleep diary f. Questionnaire survey of mental and sleep indicators g. Number of overtime hours worked h. Assessment by activity meters.

Key inclusion & exclusion criteria

• Age minimum: 20years-old
• Age maximum: 70years-old
• Gender: Male and Female
• Exclude criteria: 1) If the research participant's free and voluntary written consent cannot be obtained 2) People who have been using drugs regularly in the last 3 months. 3) People who have gained or lost weight rapidly.

Related Information

• Primary Sponsor: Japan Community Healthcare Organization Uwajima Hospital
• Source(s) of Monetary Support: Japan Community Healthcare Organization