Association between chronotype and sleep/fatigue indicators among shift workers

JRCT ID: jRCT1040240012

Registered date:10/04/2024

Basic Information

• Recruitment status: Complete
• Health condition(s) or Problem(s) studied: Sleep disorders, insufficient recovery from fatigue and presenteeism among shift worker
• Date of first enrollment: 22/10/2023
• Target sample size: 25
• Study type: Observational

Outcome(s)

• Primary Outcome: Objective sleep index (sleep efficiency) by chronotype

Secondary Outcome

Objective sleep indices: total sleep duration, duration of awakenings
Subjective sleep indices: sleep depth, number of wake after onset, sleep satisfaction
Objective fatigue index: oxidative stress value, antioxidant capacity, modification ratio
Subjective fatigue index: Fatigue visual analogue scale
Presenteeism (SPQ)
Mental health (K6)

Key inclusion & exclusion criteria

• Age minimum: >= 20age old
• Age maximum: < 50age old
• Gender: Male
• Include criteria: Male adult workers who belonged to a company cooperating in the survey and had worked in shift work for at least one month.
• Exclude criteria: Within 1 month after entering or returning to work, under treatment for sleep disorders or mental illness, female, age under 20 and over 50

Related Information

• Primary Sponsor: Kageyama Makoto