The effect of morning-focused working system on physical and mental health

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K01783
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied health science
• Research Institution: Kobe University
• Principal Investigator: Shiotani Hideyuki 神戸大学, 保健学研究科, 教授 (00294231)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 働き方改革 / 朝型勤務 / Chronotype / Social jetlag

Outline of Final Research Achievements

Several companies in Japan introduced early working conditions to. Nevertheless, individuals possess their own that is associated with worker health.The purpose of this study was to investigate the influence of chronotype and working conditions on sleep using 126 office workers who were classified as morning or evening type. We compared morning and evening type workers’ sleep quality. Additionally, we compared the same sleep quality of each chronotype category of worker under early and normal working conditions.　As the results, the evening type workers under early working conditions had earlier sleep onset/offset time and poorer sleep quality compared to those workers under normal working conditions.　These results suggest that evening type workers under early working conditions are associated with poor sleep quality. Therefore, in order to optimize worker health, we suggest that working conditions should be taken account of individual chronotypes.

Free Research Field

臨床生理学、循環器内科学

Academic Significance and Societal Importance of the Research Achievements

ポストコロナ社会における働き方は時差出勤やテレワークが推奨され大きく変貌しようとしている。今回の我々の研究で明らかになった個人のクロノタイプを重要視することが理想の勤務形態の最も重要な点であるとの結論は上記したポストコロナ社会における働き方に寄与すると考える。すなわち時差出勤やテレワークなどの勤務において個人のクロノタイプ（朝型、夜型）を科学的に評価し、単に感染予防という観点からだけでなく、これまで集団として働く際に認識されていなかった個人の生理的リズムを尊重する視点を加えることができれば、これまでの我が国の働き方の負の側面を一掃することが可能となり、さらなる健康増進が得られるものと考える。