2017 Volume 115 Pages 15-22
Purpose of this study was to investigate whether the difference in leisure-time physical activity（LTPA）pattern affects one-year after incident of poor subjective sleep quality（SSQ）in Japanese workers. Study data were obtained from a health check-up program in Tokyo, Japan in 2013. Participants of the study consisted of 3621 workers who met the following criteria: 1）not diagnosed with history of mental illness including depression, 2）not using the hypnotic and 3）not complaining of poor SSQ. LTPA was evaluated using International Physical Activity Questionnaire long version and participants were divided into 4 groups with criteria of ≥ 10 METs-hour/week: 1）not engaging in LTPA, 2）engaging in LTPA but not meeting the criteria, 3）meeting at ≤ 2 days（weekend warrior） and 4）meeting at ≥ 3 days（regularly active）. A question concerning SSQ in Pittsburgh Sleep Quality Index was used and participants who answered “fairly bad” or “very bad” were defined as poor SSQ. Logistic regression analysis was performed adjusting for age, gender, body mass index, economic status, non-working days, alcohol consumption, smoking status, psychological distress and non-LTPA（model 1）. An additional analysis adjusting for the above confounders and LTPA was performed using data from participants meeting the LTPA criteria（model 2）. Participants who engaged in ≥ 10 METs-h/wk of LTPA at ≥ 3 days significantly reduced incident of poor SSQ compared with people with not engaging in LTPA（OR = 0.57, 95%CI = 0.42–0.78）. In model 2, regularly active workers significantly reduced incident of poor SSQ compared with weekend warrior（OR = 0.62, 95%CI = 0.41–0.96）. In Japanese workers, to maintain good SSQ, engaging in LTPA regularly/habitually and obtaining ≥ 10 METs-h/w would be more effective than practicing like a weekend warrior.
