Document Detail

Can personal exposures to higher nighttime and early-morning temperatures increase blood pressure?
MedLine Citation:
PMID:  22142347     Owner:  NLM     Status:  MEDLINE    
Environmental temperatures are inversely related to BP; however, the effects of short-term temperature changes within a 24-hour period and measured with high accuracy at the personal level have not been described. Fifty-one nonsmoking patients living in the Detroit area had up to 5 consecutive days of 24-hour personal-level environmental temperature (PET) monitoring along with daily cardiovascular measurements, including BP, performed mostly between 5 pm and 7 pm during summer and/or winter periods. The associations between hour-long mean PET levels during the previous 24 hours with the outcomes were assessed by linear mixed models. Accounting for demographics, environmental factors, and monitoring compliance, systolic and diastolic BP were positively associated with several hour-long PET measurements ending from 10 to 15 hours beforehand. During this time, corresponding mostly to a period starting from between 1 am and 3 am to ending between 7 am and 9 am, an increase of 1°C was associated with a 0.81 mm Hg to 1.44 mm Hg and 0.59 mm Hg to 0.83 mm Hg elevation in systolic and diastolic BP, respectively. Modestly warmer, commonly encountered PET levels posed a clinically meaningful effect (eg, a 6.95 mm Hg systolic pressure increase per interquartile range (4.8°C) elevation at lag hour 10). Community-level outdoor ambient temperatures were not related to BP. The authors provide the first evidence that personal exposure to warmer nighttime and early-morning environmental temperatures might lead to an increase in BP during the ensuing day.
Robert D Brook; Hwashin H Shin; Robert L Bard; Richard T Burnett; Alan Vette; Carry Croghan; Ron Williams
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-11-07
Journal Detail:
Title:  Journal of clinical hypertension (Greenwich, Conn.)     Volume:  13     ISSN:  1751-7176     ISO Abbreviation:  J Clin Hypertens (Greenwich)     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-06     Completed Date:  2012-04-17     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  100888554     Medline TA:  J Clin Hypertens (Greenwich)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  881-8     Citation Subset:  IM    
Copyright Information:
© 2011 Wiley Periodicals, Inc.
Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI 48106, USA.
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MeSH Terms
Blood Pressure / physiology*
Blood Pressure Monitoring, Ambulatory
Circadian Rhythm*
Environmental Exposure*
Hot Temperature
Hypertension / diagnosis*
Middle Aged
Multivariate Analysis
Time Factors
Young Adult
Grant Support
L30 HL074786-01/HL/NHLBI NIH HHS; M01-RR000042/RR/NCRR NIH HHS

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