Validation of the reduced morningness-eveningness questionnaire (rMEQ: reduced morningness-eveningness questionnaire) in Japanese

JRCT ID: jRCT1030230180

Registered date:25/06/2023

Basic Information

• Recruitment status: Recruiting
• Health condition(s) or Problem(s) studied: Circadian rhythm disorders
• Date of first enrollment: 25/06/2023
• Target sample size: 2243
• Study type: Interventional
• Intervention(s): In Study 2, the subjects spend 6 hours in a dark (less than 1 lx illumination) laboratory and saliva is collected once an hour.

Outcome(s)

Primary Outcome

Association between chronotypes determined by MEQ and rMEQ, respectively
Association between DLMO and sleep rhythm phase and chronotypes determined by rMEQ

Secondary Outcome

Questionnaires with significant contribution to chronotype determination
Association of chronotype with sleep irregularities

Key inclusion & exclusion criteria

• Age minimum: >= 20age old
• Age maximum: <= 79age old
• Gender: Both

Include criteria

Study 1:
1) Persons who are between 20 and 79 years old at the time of response.
2) Who are able to respond to the questionnaire via the Internet.
Study 2
1) Males and females between 20 and 60 years of age at the time of consent

Exclude criteria

Study 1:.
1) Persons with pre-existing medical conditions (cardiovascular, liver, endocrine system, brain/neurological, psychiatric, etc.), taking therapeutic drugs, or having a history of such conditions that may affect the study results
2) Persons who are dependent on alcohol or who are found to be in the habit of excessive alcohol consumption
3) Those who have a habit of taking drugs or supplements that affect sleep.
4) Pregnant, lactating, or planning to become pregnant during the study period
5) Who are using an implantable medical device such as a pacemaker
6) Any other person deemed inappropriate by the principal investigator.
Study 2: The following are not included in the study
1) Persons with pre-existing medical conditions (cardiovascular, liver, endocrine, brain/neurological, psychiatric, etc.), taking therapeutic drugs, or having a history of such conditions that may affect the results of the study
2) Those who have engaged in time-lagged travel or shift work at least 6 months prior to the experiment.
3) Persons who have been found to be dependent on alcohol or to have excessive drinking habits
4) Persons with excessive smoking habits
5) Those who have a habit of taking drugs or supplements that affect sleep
6) Those with abnormal color vision
7) Those who have a phobia of dark places
8) Other subjects deemed inappropriate by the principal investigator

Related Information

• Primary Sponsor: Kitamura Shingo
• Source(s) of Monetary Support: Japan Society for the Promotion of Science