Fujiwara T, Kawamura M, Nakajima J, Adachi T, Hiramori K
Second Department of Internal Medicine, Iwate Medical University, Japan.
J Hypertens. 1995 Dec;13(12 Pt 2):1747-52.
To determine whether there is a seasonal variation in blood pressure in hypertensive patients whose daily lifestyle is similar in summer and in winter, and who live almost entirely indoors in a stable environmental temperature.
During summer and winter, blood pressure was measured by ambulatory blood pressure monitoring in outpatients with essential hypertension, and environmental temperature was measured by electrothermometer while the patients were awake. The 24-h blood pressure data were analysed after being divided into four groups: morning, afternoon, night-time and sleeping periods.
We studied 25 outpatients (mean +/- SD age 57 +/- 12 years) who spend virtually the entire day indoors in both summer and winter. Measurements of systolic and diastolic blood pressure in the morning and night-time periods were significantly higher in winter than in summer (differences of 7.5 +/- 14.7 and 4.1 +/- 8.8 mmHg and 8.2 +/- 14.8 and 4.5 +/- 8.1 mmHg, respectively). Blood pressure measured in the afternoon and during sleeping periods did not differ significantly. No correlation was observed between the seasonal change in blood pressure in the morning and that at night. Environmental temperatures were significantly higher in the morning, afternoon and night-time periods during summer than those during winter. The differences among these periods were not statistically significant.
There is a seasonal variation in blood pressure in the morning and night-time periods during winter in hypertensive patients who live essentially indoors in a relatively stable environmental temperature. Pressor factor(s) may differ between morning and night-time periods during winter.
确定在夏季和冬季日常生活方式相似、几乎完全在稳定环境温度的室内生活的高血压患者血压是否存在季节性变化。
在夏季和冬季，采用动态血压监测法测量原发性高血压门诊患者的血压，患者清醒时用电温度计测量环境温度。将24小时血压数据分为四组进行分析：早晨、下午、夜间和睡眠时段。
我们研究了25名门诊患者（平均±标准差年龄57±12岁），他们在夏季和冬季几乎一整天都待在室内。冬季早晨和夜间的收缩压和舒张压测量值显著高于夏季（分别相差7.5±14.7和4.1±8.8 mmHg以及8.2±14.8和4.5±8.1 mmHg）。下午和睡眠时段测量的血压无显著差异。早晨和夜间血压的季节性变化之间未观察到相关性。夏季早晨、下午和夜间的环境温度显著高于冬季。这些时段之间的差异无统计学意义。
对于基本在相对稳定环境温度的室内生活的高血压患者，冬季早晨和夜间血压存在季节性变化。冬季早晨和夜间的升压因素可能不同。
