Is it normal to hold a deep breath and start
It is a physiological effects more pronounced in certain individuals.
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Regarding your issue of concern, I would like to confirm your physiological connection between the forceful contained deep breathing and fainting.
This situation induces a Valsalva maneuver leading to decreased blood pressure at the level of aorta, which in turn may be reflected as decreased cerebral blood flow.
When this phenomenon is exaggerated, it may lead near fainting and even syncope.
This is more pronounced in some sensitive individuals.
Coming to this point, I recommend avoiding such stressful situations and a better control of your blood pressure values.
Hope to have clarified some of your uncertainties!
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