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
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
复制标题
老年人睡前热水沐浴时间与夜间/睡眠血压和浸泡之间的关联：家庭环境中重复测量的纵向分析
DOI：
10.1080/07420528.2019.1675685
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发表时间：
2019
影响因子：
2.8
通讯作者：
Obayashi Kenji
中科院分区：
文献类型：
--
作者：
Tai Yoshiaki;Saeki Keigo;Yamagami Yuki;Yoshimoto Kiyomi;Kurumatani Norio;Nishio Kenji;Obayashi Kenji
热水洗澡是日本的一种传统做法，但还没有因为它与夜间和睡眠时血压(BP)的关联而在大量人口中进行评估。在这项纵向分析中，对758名日本老年人连续两晚重复测量了沐浴参数和动态血压。受试者根据在浴缸中浸泡时间的三分位数(持续时间：三分位数，11和15℃)、从洗澡结束到就寝时间(睡前时间：三分位数，42和106分)和浴缸热水的温度(水温：四分位数，40.3和41.2°C)分为三组。参与者的平均年龄为70.9岁，夜间和睡眠时间的平均收缩压和下降压分别为115.1±16.1%，114.2±16.2%和14.2%±8.8%。调整了潜在混杂因素的多变量混合效应线性回归模型显示，睡前中段组夜间SBP较长组降低1.7 mm Hg(95%CI，0.2~3.1)，短组降低1.9 mm Hg(95%CI，0.1~3.7)。睡前中间时间组与长时间组相比，睡前中间时间组和短时间组分别增加1.8%(95%CI，0.7~2.9)和1.8%(95%CI，0.6~3.1)。这些关联在睡眠时间SBP方面是一致的。相反，水温和持续时间与任何动态血压参数均无显著关联。值得注意的是，随着水温的增加，睡前时间显著延长(趋势P=0.006)。总而言之，这项研究的发现表明，在老年人群中，日本人洗热水洗澡，特别是从洗澡结束到睡觉时间的较短时间，与夜间和睡眠时间较低的血压和较大的血压波动有关。
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.