Instances of high blood pressure (systolic blood pressure higher than 159, or diastolic higher than 94 millimetres of mercury or higher) in the study were found in 33.4 percent of participants during winter but just 23.8 percent during summer.
The reason could be related to the barereflex, 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. 5 mm change in blood pressure can explain why there are more deaths of heart patients in winter.
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