Social jetlag, a misalignment of biological and social time, and health effect assosiation in Japanese working population

Research Project

Project/Area Number	25870191
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Hygiene and public health Epidemiology and preventive medicine
Research Institution	The University of Tokyo
Principal Investigator	KURODA Reiko 東京大学, 環境安全本部, 助教 (50553111)
Research Collaborator	OKUBO Yasushi 東京大学, 環境安全本部, 教授
Project Period (FY)	2013-04-01 – 2015-03-31
Project Status	Completed (Fiscal Year 2014)
Budget Amount *help	¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000) Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000) Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords	Social jetlag / 社会的時差ボケ / 睡眠 / 健康影響 / 朝型夜型 / Chronotype / 抑うつ / 時間生物学 / Social jetlag / 勤務スケジュール / 生活リズム / 産業保健
Outline of Final Research Achievements	This study aimed to examine the association between health effects and spcial jetlag, a misalignment of biological and social time, in occupational setting. First, we examined the reliability by test-retest in 113 subject and the validity in 47 subjects by comparing actigraphy for 7days.A highly statistical positive correlation was observed in the both of test-retest and validity.Second,Logistic regression analysis was performed to determine the odds ratio for each health effect for each category of social jetlag (<30, 30-149, 150<= min with adjustments for age, sex, mean sleep duration, job position, time or overwork, body mass index (except for obescity), chronotype, and smoking status .In a Japanese working population, there was a suggestion of U-shaped relationship between social jeltga and prevalence of Diabetes, Hyperlipidemia, Hyperuricemia, and obescity (BMI over 30). Depression is tended to increase with increasing social jetlag.