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That's because low temperatures cause your blood vessels to narrow — which increases blood pressure because more pressure is needed to force blood through your narrowed veins and arteries.

The normal range of blood pressure is: systolic blood pressure is between 90-140mmhg (12.0-18.7kpa), diastolic blood pressure is between 60-90mmhg (8.0-12.0kpa), higher than this range may be hypertension or borderline hypertension, lower than this range may be hypotension.

Electronic sphygmomanometer is a kind of medical equipment which uses modern electronic technology and indirect blood pressure measurement principle to measure blood pressure.

There are four generations of electronic blood pressure monitors. The structure of the third generation electronic sphygmomanometer is described below.

Pulse wave: blood pressure monitoring pulse wave holographic review, can be used as a reference for doctors to evaluate the degree of flexibility of the patient's blood vessels. Infrared transmission: Infrared transmission technology is used for monitor information playback to avoid accidental failure in wired data transmission, resulting in 24-hour data loss.