Relationship between Indoor Temperature near the Floor and Winter Blood Pressure in Winter: A Multi-level Analysis

摘要

Recently, the effects of indoor air temperature on blood pressure (BP) have attracted attention. However, there have been few studies focusing on temperatures near the floor. In this work, we analyzed the relationship between indoor near-floor temperatures and BP by multi-level analysis. Data were obtained from field surveys of indoor temperature, home BP measurements, and personal attributes conducted in Tokyo and surrounding areas from November 2014 to March 2015. When the morning room temperature at a height of 1.1 m was 20°C, the corresponding mean near-floor temperature was about 15°C in the low thermal insulation group and about 18°C in the high thermal insulation group. Multi-level analysis showed that morning systolic BP (SBP) increased by 1.0 mmHg per 1°C decrease in near-floor temperature, and by 0.8 mmHg per 1°C decrease in room temperature. These findings suggest that near-floor temperature has a stronger association with morning SBP than room temperature did.