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Holding Breath during blood pressure test (not trying to cheat)

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i am writing a paper on the effects of breathing on blood pressure. i know about all the recent stuff about slower breathing may help, but my question is, what would happen if you hold your breath during a blood pressure reading.

would pressure increase or decrease and by about how much do you think.

my thinking is it would decrease because vessels will expand to try to get more oxygen? any info would be great.
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replied April 7th, 2012
I assume you are a student. Breathing does affect blood pressure, and this effect is particularly noticeable with certain disease processes (such as constrictive pericarditis). I don't know that "slower breathing may help" but do know that there is a phasic effect of normal breathing (inspiration v experation) on blood pressure. I suspect that breath holding would have little effect on blood pressure over short periods of time. I suggest you look up the effects on blood pressure of cardiac diseases and various medications for your paper.

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