Fumihiko Suzuki1, Emi Morita2,3, Sakae Miyagi4, Hiromasa Tsujiguchi1,5, Akinori Hara1,5, Thao Thi Thu Nguyen1,6, Yukari Shimizu1,7, Koichiro Hayashi1,8, Keita Suzuki1,8, Takayuki Kannon5,9, Atsushi Tajima5,9, Sumire Matsumoto2,10, Asuka Ishihara2,10, Daisuke Hori11, Shotaro Doki11, Yuichi Oi11, Shinichiro Sasahara11, Makoto Satoh2, Ichiyo Matsuzaki2,11, Masashi Yanagisawa2, Toshiharu Ikaga12, Hiroyuki Nakamura1,5. 1. Department of Environmental and Preventive Medicine, Graduate School of Medical Science, Kanazawa University, Kanazawa, Ishikawa, Japan. 2. International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan. 3. Forestry and Forest Products Research Institute, Forest Research and Management Organization, Tsukuba, Ibaraki, Japan. 4. Innovative Clinical Research Center, Kanazawa University, Kanazawa, Ishikawa, Japan. 5. Advanced Preventive Medical Sciences Research Center, Kanazawa University, Kanazawa, Ishikawa, Japan. 6. Faculty of Public Health, Haiphong University of Medicine and Pharmacy, Ngo Quyen, Hai Phong, Vietnam. 7. Department of Nursing, Faculty of Health Sciences, Komatsu University, Komatsu, Ishikawa, Japan. 8. Department of Public Health, Graduate School of Advanced Preventive Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan. 9. Department of Bioinformatics and Genomics, Graduate School of Advanced Preventive Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan. 10. Ph.D. Program in Human Biology, University of Tsukuba, Tsukuba, Ibaraki, Japan. 11. Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan. 12. School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University, Kohoku, Yokohama, Japan.
Abstract
STUDY OBJECTIVES: Although associations between sleep quality and environmental factors and nutrient intake have been reported, interactions between these factors have not been elucidated in detail. Therefore, this cross-sectional study examined the effects of regular exercise and nutrient intake on sleep quality using the Pittsburgh Sleep Quality Index (PSQI), which is the most frequently used index for sleep evaluation. METHODS: The participants included 378 individuals aged 40 years or older living in Shika Town, Ishikawa Prefecture. Of these individuals, 185 met the inclusion criteria. The participants completed a self-administered questionnaire assessing lifestyle habits and frequency and duration of exercise, the PSQI, and the brief-type self-administered diet history questionnaire (BDHQ) on nutrient intake. RESULTS: A two-way analysis of covariance on regular exercise and PSQI scores indicated that protein intake (17.13% of energy) was significantly higher in the regular exercise and PSQI ≤10 groups than in the non-regular exercise or PSQI ≥11 groups (p = 0.002). In a multiple logistic regression analysis with PSQI scores (≤10 and ≥11), protein intake was a significant independent variable in any of the models adjusted for confounding factors such as age, sex, body mass index, current smoker, and current drinker (OR: 1.357, 95% CI: 1.081, 1.704, p = 0.009) in the regular exercise group but not in the non-regular exercise group.Conclusions We identified a positive relationship between sleep quality and protein intake in the regular exercise group. These findings suggest that regular exercise at least twice a week for 30 minutes or longer combined with high protein intake contributes to good sleep quality.
STUDY OBJECTIVES: Although associations between sleep quality and environmental factors and nutrient intake have been reported, interactions between these factors have not been elucidated in detail. Therefore, this cross-sectional study examined the effects of regular exercise and nutrient intake on sleep quality using the Pittsburgh Sleep Quality Index (PSQI), which is the most frequently used index for sleep evaluation. METHODS: The participants included 378 individuals aged 40 years or older living in Shika Town, Ishikawa Prefecture. Of these individuals, 185 met the inclusion criteria. The participants completed a self-administered questionnaire assessing lifestyle habits and frequency and duration of exercise, the PSQI, and the brief-type self-administered diet history questionnaire (BDHQ) on nutrient intake. RESULTS: A two-way analysis of covariance on regular exercise and PSQI scores indicated that protein intake (17.13% of energy) was significantly higher in the regular exercise and PSQI ≤10 groups than in the non-regular exercise or PSQI ≥11 groups (p = 0.002). In a multiple logistic regression analysis with PSQI scores (≤10 and ≥11), protein intake was a significant independent variable in any of the models adjusted for confounding factors such as age, sex, body mass index, current smoker, and current drinker (OR: 1.357, 95% CI: 1.081, 1.704, p = 0.009) in the regular exercise group but not in the non-regular exercise group.Conclusions We identified a positive relationship between sleep quality and protein intake in the regular exercise group. These findings suggest that regular exercise at least twice a week for 30 minutes or longer combined with high protein intake contributes to good sleep quality.
Authors: Lovro Štefan; Goran Vrgoč; Tomislav Rupčić; Goran Sporiš; Damir Sekulić Journal: Int J Environ Res Public Health Date: 2018-11-09 Impact factor: 3.390