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I find that my pattern of breathing has a massive effect on my blood pressure. If I slow my breathing, I can have a large drop from 135/60 to 110/60 (my bottom number is always quite low but my top number can go high).

Since discovering this, I’ve seen some articles about how slow exhalation stimulates the vagus nerve which causes a drop in blood pressure, which offers an explanation.

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Highly recommend reading James Nestor's Breath [1]. There is an incredible body of breathing modalities from ancient to modern. James does an incredible job of presenting a non-biased journey through it with a dose of humility and a childlike sense of awe. I finally got my Wimhof practice on track after it.

[1] https://www.amazon.com/Breath-New-Science-Lost-Art/dp/073521...

You can also stimulate it directly by stroking the scalene muscles of the neck which lay over that nerve.

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