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Please use this identifier to cite or link to this item: http://hdl.handle.net/10564/3775

Title: Association between timing of hot water bathing before bedtime and night-/sleep-time blood pressure and dipping in the elderly: a longitudinal analysis for repeated measurements in home settings.
Other Titles: 高齢者の入浴タイミングと夜間血圧低下の関連:自宅での繰り返し実測データを用いた縦断的分析
Authors: Tai, Yoshiaki
Saeki, Keigo
Yamagami, Yuki
Yoshimoto, Kiyomi
Kurumatani, Norio
Nishio, Kenji
Obayashi, Kenji
Keywords: Bathing
nighttime blood pressure
sleep-time blood pressure
dipping
hot water
passive body heating
Issue Date: Dec-2019
Publisher: Taylor & Francis
Citation: Chronobiology international Vol.36 No.12 p.1714-1722 (2019 Dec)
Abstract: Hot water bathing – a Japanese traditional practice – has not been evaluated for its association with night- and sleep-time blood pressure (BP) in large population. In this longitudinal analysis, bathing parameters and ambulatory BP were repeatedly measured for 2 nights in 758 Japanese elderly individuals. Participants were divided into three groups according to tertile values of time soaked in the bathtub (Duration: tertile value, 11 and 15 min), time from bathing-end to bedtime (Time before bedtime: tertile value, 42 and 106 min), and temperature of hot water in the bathtub (Water temp: tertile value, 40.3 and 41.2 °C). Participants’ mean age was 70.9 years, and mean night- and sleep-time systolic BP (SBP) and dipping were 115.1 ± 16.1, 114.2 ± 16.2 mmHg, and 14.2 ± 8.8%, respectively. Multivariable mixed-effect linear regression models adjusted for potential confounding factors suggested that nighttime SBP was significantly lower in the intermediate Time before bedtime group by 1.7 mmHg (95% CI, 0.2–3.1) and in the short group by 1.9 mmHg (95% CI, 0.1–3.7) than that in the long group. Dipping was significantly greater in the intermediate Time before bedtime group by 1.8% (95% CI, 0.7–2.9) and in the short group by 1.8% (95% CI, 0.6–3.1) than that in the long group. These associations were consistent regarding sleep-time SBP. Conversely, Water temp and Duration did not significantly associate with any ambulatory BP parameter. Remarkably, Time before bedtime significantly prolonged with increases in tertiles of Water temp (P for trend = 0.006). In conclusion, the findings of this study revealed that Japanese hot water bathing, especially the short time from bathing-end to bedtime, was associated with lower night- and sleep-time BP and greater dipping in an elderly population.
Description: 博士(医学)・甲第751号・令和2年9月30日
This is a post-peer-review, pre-copyedit version of an article published in Chronobiology international. The final authenticated version is available online at: https://doi.org/10.1080/07420528.2019.1675685.
URI: http://hdl.handle.net/10564/3775
ISSN: 07420528
Academic Degrees and number: 24601A751
Degree-granting date: 2020-09-30
Degree name: 博士(医学)
Degree-granting institutions: 奈良県立医科大学
Appears in Collections:2020年度

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