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CC BY-NC-ND 4.0 · Sleep Sci 2024; 17(02): e151-e156
DOI: 10.1055/s-0043-1777777
Original Article

Association between Social Jetlag and Objective Physical Activity among Female University Students of Japan: A Cross-Sectional Study

Masashi Shibata 
1   Laboratory of Exercise Science, College of Nursing Art and Science, University of Hyogo, Akashi, Hyogo, Japan
,
Mami Fujibayashi
2   Laboratory of Exercise Physiology, Faculty of Agriculture, Setsunan University, Hirakata, Osaka, Japan
,
Shiori Shibata
3   Foundation of Nursing Region, Kobe City College of Nursing, Kobe, Hyogo, Japan
,
Kenji Kuzuhara
4   Department of Athletic Training and Conditioning, School of Health and Sports Sciences, Chukyo University, Toyota, Aichi, Japan
,
Keiko Tanida
5   Laboratory of Nursing Physiology and Anatomy, College of Nursing Art and Science, University of Hyogo, Akashi, Hyogo, Japan
› Author Affiliations Funding This study was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS KAKENHI Grant Number 18K10930).
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Abstract

Objective Discrepancies between sleep timing on work/school and free days, also known as social jetlag (SJL), can cause health problems. These issues occur most often in individuals from adolescence to the early 20s, which is equivalent to the age of university students. This study was designed to explore the recommended level of physical activity required to minimize SJL and to examine the relationship between SJL and objective physical activity among female university students.

Methods We assessed the SJL of 68 female students using the Japanese version of the Munich Chronotype Questionnaire. The objective physical activity and sleep variables of subjects were also evaluated at 3 to 4 weeks using a small triaxial accelerometer.

Results A significant negative correlation was found between SJL and physical activity on both free (r = − 0.435, p < 0.001) and school days (r = − 0.341, p < 0.01). According to the linear regression analysis, physical activity of 11,174 steps on school days and 10,713 steps on free days had the lowest SJL value. Total sleep time on free days had a significant positive correlation with SJL (r = 0.399, p < 0.001) and a negative correlation with physical activity (r = − 0.520, p < 0.001).

Discussion Our results suggest that substantial SJL may cause chronic fatigue and lead to a low level of physical activity in female university students. These results also imply that the recommended level of physical activity necessary to minimize SJL among these students is around 11,000 steps on both school and free days.

Keywords

social jetlag - physical activity - circadian rhythm - university students


Publication History

Received: 03 December 2022

Accepted: 27 August 2023

Article published online:
20 February 2024

© 2024. Brazilian Sleep Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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