The effect of a colder room vs a warmer room on your reading.

Q: Can being in a cold room and taking your blood pressure result in a noticeable increase compared with a warmer room? I am thinking of the peripheral vasoconstriction vs vasodilatation effect.

A: Blood vessels constrict in response to cold to help maintain body heat. This can increase blood pressure but within the normal range. Likewise, blood vessels dilate when you get hot to help the body get rid of heat. This can lower blood pressure but it should remain normal. If you take your pressure in a super air-conditioned room, it is likely to be slightly higher than in a overly warm room. However, with prolonged exposure to extreme heat or cold, blood pressure may go way out of control in a last effort attempt of the body to preserve function and prevent death.

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