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Cold Weather may Raise Blood Pressure of the Old
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Testing the blood pressure |
The systolic (top number) and diastolic (bottom number) blood pressures both rise and fall, with the change of seasons. That is the survey result from the 8,801 people, aged 65 or older. The average systolic blood pressure was five points higher in winter than in summer for the surveyed people. Instances of high blood pressure (systolic blood pressure higher than 159, or diastolic higher than 94 millimeters of mercury or higher) were found in 33.4 percent of participants during winter.
The reasons for the correlation were not known. It may be related to the baroreflex, a mechanism of blood pressure regulation that is modified in elderly subjects or a function of the sympathetic nervous system, which helps control involuntary actions such as stress response.
Seasonal variance in blood pressure has been noted in past studies, but not specifically in the elderly.
Although this study does not represent a causal link between blood pressure and external temperature, the observed relationship has potentially important consequences for blood pressure treatment in the old people.
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