Inverse correlation between daily outdoor temperature and blood pressure in six US cities

Abstract

This study aims to evaluate the relationship between mean outdoor temperature and mean daily blood pressure (BP) and heart rate (HR) among six, large, geographically and climatically diverse US cities. We collected BP and HR data from Higi stations, located in a wide range of neighborhood grocery stores and retail pharmacies, from six US cities (Houston, Los Angeles, Miami, Boise, Chicago, and New York City). Outdoor daily temperature data were collected from the National Centers for Environmental Information’s database. Pearson’s correlation was used to assess the linear relationship between mean daily outdoor temperature and mean daily BP and HR for each city from May 2016 through April 2017. A total of 2 140 626 BP and HR readings were recorded in the six study cities. Mean outdoor temperature was inversely correlated with both mean daily average systolic (r=−0.69, P<0.0001) and diastolic (r=−0.71; P<0.0001) BPs, but not HR (r<0.0001, P=0.48). We also found that temperature change had a larger impact on BP in equatorial climates such as Miami compared with colder and more temperature variable cities like Chicago and Boise. Previous studies have found that BP varies seasonally, but few have looked at the impact of daily temperature on both BP and HR changes. Our study is one of the largest and most climatically diverse populations ever looking at this relationship. Our results suggest that temperature, and perhaps geography, should play a role in tailoring individualized evaluation and treatment for hypertensive diseases.

Telemedicine in the management of hypertension: Evolving technological platforms for blood pressure telemonitoring

“…Easy‐access blood pressure telemonitoring facilities are needed and may encourage people to perform blood pressure measurement. In the United States, such a facility has been established in “Higi” stations (http://www.higi.com), which provided users with free health screening measurements, including blood pressure, heart rate, body weight, and body mass index at food, drug, and club retail locations nationwide 13 . In China, we established a nationwide blood pressure telemonitoring system in public places within easy reach of people.…”

Low ambient temperature and hospitalization for cardiorespiratory diseases in Brazil

“…Additionally, the physiological response to cold exposure may differ between the respiratory and cardiovascular systems, which could further contribute to the observed differences in risk. Studies have reported varying effects of cold temperatures on different physiological parameters, such as heart rate, blood pressure, and respiratory function, depending on the specific population and environmental conditions being studied (Kaldur et al, 2016) (Radin et al, 2018) (D'Amato et al, 2018a. Note that the specific factors underlying the observed differences in risk are likely to be complex and multifactorial, and may vary depending on the population and environmental conditions being studied.…”

“…When a person is exposed to cold temperatures, their body may experience several physiological changes. These changes can include an increase in heart rate (Kaldur et al, 2016), a decrease in blood pressure (Radin et al, 2018), and an increased susceptibility to respiratory infections (D'Amato et al, 2018a). These negative effects can be particularly harmful for people with pre-existing respiratory or cardiovascular conditions, such as asthma (Sohail et al, 2022), chronic obstructive pulmonary disease (Tseng et al, 2013), emphysema (D'Amato et al, 2018b), and cardiac failure (Ikäheimo, 2018).…”

Epidemiological evidence on drinking water salinity and blood pressure: a scoping review

“…Ambient air temperature measurements in the selected studies was used as confounder in the relationship between water salinity and BP. It is well known that low temperature may increase BP (Radin et al 2018): low temperatures cause vasoconstriction, while high temperatures cause vasodilation (Johnson et al 2014). Also, water salinity levels may increase as a result of enhanced evapotranspiration phenomena during the warmer periods of the year.…”