Nobuo Sasaki1, Saeko Fujiwara2, Hidehisa Yamashita3, Ryoji Ozono4, Yuko Monzen2, Kazushi Teramen5, Yasuki Kihara6. 1. Health Management and Promotion Center, Hiroshima Atomic Bomb Casualty Council, Hiroshima, Japan. Electronic address: nb7ssk7@sd6.so-net.ne.jp. 2. Health Management and Promotion Center, Hiroshima Atomic Bomb Casualty Council, Hiroshima, Japan. 3. Department of Psychiatry and Neurosciences, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan. 4. Department of General Medicine, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan. 5. Department of Internal Medicine, Mitsubishi Mihara Hospital, Mihara, Japan. 6. Department of Cardiovascular Medicine, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
Abstract
OBJECTIVE: The objective of this study was to investigate the association between obesity and sleep habits, including bedtime, wake-up time, and sleep duration variability over a week. METHODS: We analyzed 9289 participants in this study. Following a health examination, each participant self-reported their sleep habits using a standardized 19-item questionnaire. High sleep duration variability was defined as sleep varying ≥3h of the difference between the longest and shortest sleep durations reported over a week-long period. Late bedtime and early wake-up time were defined as 24:00h or later, and before 6:00h, respectively. Obesity was defined as a body mass index (BMI) of ≥25kg/m2. Subgroup analysis included age (younger group defined as age <65 years vs. elderly group defined as age ≥65 years). RESULTS: After adjusting for confounding factors and sleep duration, high sleep duration variability [odds ratio (OR), 1.20; p<0.005] was significantly associated with a high OR of obesity. Late bedtime (OR, 1.18; p<0.01) was significantly associated with a high OR of obesity, whereas early wake-up was not. In the subgroup analysis, high sleep duration variability had a significant association with the younger group (OR, 1.25; p<0.001), whereas late bedtime had a significant association with the elderly group (OR, 1.36; p<0.005). CONCLUSIONS: Inappropriate sleep habits, particularly high sleep duration variability in young individuals and late bedtime in the elderly, are associated with a high prevalence of obesity, independently of sleep duration.
OBJECTIVE: The objective of this study was to investigate the association between obesity and sleep habits, including bedtime, wake-up time, and sleep duration variability over a week. METHODS: We analyzed 9289 participants in this study. Following a health examination, each participant self-reported their sleep habits using a standardized 19-item questionnaire. High sleep duration variability was defined as sleep varying ≥3h of the difference between the longest and shortest sleep durations reported over a week-long period. Late bedtime and early wake-up time were defined as 24:00h or later, and before 6:00h, respectively. Obesity was defined as a body mass index (BMI) of ≥25kg/m2. Subgroup analysis included age (younger group defined as age <65 years vs. elderly group defined as age ≥65 years). RESULTS: After adjusting for confounding factors and sleep duration, high sleep duration variability [odds ratio (OR), 1.20; p<0.005] was significantly associated with a high OR of obesity. Late bedtime (OR, 1.18; p<0.01) was significantly associated with a high OR of obesity, whereas early wake-up was not. In the subgroup analysis, high sleep duration variability had a significant association with the younger group (OR, 1.25; p<0.001), whereas late bedtime had a significant association with the elderly group (OR, 1.36; p<0.005). CONCLUSIONS: Inappropriate sleep habits, particularly high sleep duration variability in young individuals and late bedtime in the elderly, are associated with a high prevalence of obesity, independently of sleep duration.
Authors: Christopher E Kline; Eileen R Chasens; Zhadyra Bizhanova; Susan M Sereika; Daniel J Buysse; Christopher C Imes; Jacob K Kariuki; Dara D Mendez; Mia I Cajita; Stephen L Rathbun; Lora E Burke Journal: Int J Obes (Lond) Date: 2021-01-07 Impact factor: 5.095
Authors: Thomas J Altree; Delwyn J Bartlett; Nathaniel S Marshall; Camilla M Hoyos; Craig L Phillips; Callum Birks; Aran Kanagaratnam; Anna Mullins; Yasmina Serinel; Keith K H Wong; Brendon J Yee; Ronald R Grunstein; Elizabeth A Cayanan Journal: Sleep Breath Date: 2021-08-06 Impact factor: 2.816