Document Detail


Impact of outdoor temperature on prewaking morning surge and nocturnal decline in blood pressure in a Japanese population.
MedLine Citation:
PMID:  20882031     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Seasonal variations in blood pressure (BP) have often been attributed to meteorological factors, especially changes in outdoor temperature. We evaluated the direct association between meteorological factors and circadian BP variability. Twenty-four-hour ambulatory BP was monitored continuously for 7 days in 158 subjects. Mean awake, asleep, morning (first 2 h after waking) BP, prewaking morning BP surge (morning systolic BP (SBP)-mean SBP during the 2-h period before waking) and nocturnal BP decline were measured each day. We compared BP values for the lowest and highest days with regard to the daily mean outdoor temperature and mean atmospheric pressure. Morning BP and prewaking morning BP surge on the coldest day were significantly higher than those on the warmest day (morning SBP, 136.6 ± 1.6 vs. 133.1 ± 1.5 mm Hg, P = 0.002; morning diastolic BP, 84.4 ± 0.9 vs. 82.6 ± 0.9 mm Hg, P = 0.02; and prewaking morning BP surge, 20.8 ± 1.3 vs. 15.3 ± 1.3 mm Hg, P = 0.0004). The magnitude of nocturnal BP decline on the coldest day was significantly greater than that on the warmest day (15.8 ± 0.7 vs. 13.9 ± 0.7%, P = 0.01). Outdoor temperature is an important determinant of morning BP, prewaking morning BP surge and the magnitude of nocturnal BP decline. These findings may have important implications in management of hypertension and prevention of cardiovascular events.
Authors:
Shougo Murakami; Kuniaki Otsuka; Tatsuji Kono; Akiko Soyama; Tatsuya Umeda; Naomune Yamamoto; Hideaki Morita; Gaku Yamanaka; Yasushi Kitaura
Publication Detail:
Type:  Journal Article     Date:  2010-09-30
Journal Detail:
Title:  Hypertension research : official journal of the Japanese Society of Hypertension     Volume:  34     ISSN:  1348-4214     ISO Abbreviation:  Hypertens. Res.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9307690     Medline TA:  Hypertens Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  70-3     Citation Subset:  IM    
Affiliation:
Third Division, Department of Internal Medicine, Osaka Medical College, Osaka, Japan. shougo17@gb3.so-net.ne.jp
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Comments/Corrections
Comment In:
Hypertens Res. 2011 Jan;34(1):36-8   [PMID:  20981033 ]

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