Effects of social jet-lag on sleep variables and physical activity among university students

• Project/Area Number: 18K10930
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 59030:Physical education, and physical and health education-related
• Research Institution: University of Hyogo
• Principal Investigator: Shibata Masashi 兵庫県立大学, 看護学部, 教授 (00254467)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 社会的時差 / 睡眠指標 / 身体活動 / サーカディアンリズム / 大学生 / 運動部 / 睡眠効率 / 時差勤務 / 客観的睡眠指標 / 睡眠覚醒周期

Outline of Final Research Achievements

Discrepancies between sleep timing on work/school days and free days, also known as social jetlag (SJL), can cause health problems. The purpose of this study was to investigate the relationships among SJL, daily physical activity and sleep variables. In night shift workers, physical activity showed a significant negative correlation (r=-0.360, p<0.01) with waking after sleep onset, and a positive correlation (r=0.220, p<0.05) with sleep efficiency. In female university students, there was a significant negative correlation (r = -0.530, p < 0.01) between the SJL and physical activity. However, in university rugby players, no association was found between SJL and physical activity. As a result of team practice, individual differences in physical activity became smaller, and its influence was considered.

Academic Significance and Societal Importance of the Research Achievements

本研究では、健康被害をもたらす可能性のある社会的時差（Social Jet-Lag）について身体活動や睡眠指標の観点から検討を行った。社会的時差の大きい深夜交替制勤務者や大学生において、高い身体活動は良好な睡眠指標や、小さな社会的時差と関連した。一方で、運動部のような身体活動の個人差が小さい集団では社会的時差と身体活動は関連しなかった。低くなりがちな休日の身体活動を改善して平日との差を小さくすることにより、社会的時差や睡眠の改善に貢献する可能性が示唆された。

Research Products

• [Journal Article] Lifestyle and health (2020)
  • Author(s): Masashi Shibata, Mami Fujibayashi
  • Journal Title: The Journal of Physical Fitness and Sports Medicine Volume: 9 Issue: 6 Pages: 330-339
  • DOI: 10.7600/jpfsm.9.330
  • NAID: 130007942307
  • ISSN: 2186-8123, 2186-8131
  • Year and Date: 2020-11-25
  • Peer Reviewed / Open Access
• [Presentation] 大学生における社会的時差と身体活動の関連 (2020)
  • Author(s): 柴田真志、藤林真美
  • Organizer: 第75回日本体力医学会
• [Presentation] ソーシャル・ジェットラグと健康および運動との関連 (2020)
  • Author(s): 柴田真志
  • Organizer: 日本ストレングス＆コンディショニング協会カンファレンス2020
• [Presentation] Effects of exercise intervention to midnight shift workers. (2019)
  • Author(s): Fujibayashi H, Shibata M, Tsujita T, Umeda Y.
  • Organizer: International Society of Behavioral Nutrition and Physical Activity 2019 Meeting.
  • Int'l Joint Research
• [Presentation] 深夜交替制勤務者における客観的睡眠指標と身体活動量の関連 (2019)
  • Author(s): 柴田真志, 藤林真美, 辻田那月, 梅田陽子
  • Organizer: 日本睡眠学会第44回定期学術大会
• [Presentation] 深夜交替勤務者における抑うつ状態の探求 (2019)
  • Author(s): 藤林真美, 梅田陽子, 辻田那月, 柴田真志
  • Organizer: 第74回日本体力医学会大会
• [Presentation] 深夜交替制勤務者における睡眠指標と飲酒習慣の関係 (2019)
  • Author(s): 梅田陽子, 藤林真美, 辻田那月, 柴田真志
  • Organizer: 第78回日本公衆衛生学会総会
• [Presentation] 深夜交替勤務者における客観的睡眠指標と身体活動量の関連 (2019)
  • Author(s): 柴田真志、藤林真美、辻田那月、梅田陽子
  • Organizer: 日本睡眠学会第44回定期学術集会
• [Presentation] Effects of exercise intervention to midnight shift workers (2019)
  • Author(s): Fujibayashi M., Shibata M., Tsujita N., Umeda Y.
  • Organizer: International Society of Behavioral Nutrition and Physical Activity 2019 Meeting
  • Int'l Joint Research