The Valsalva maneuver also corrects some rapid heartbeats originating in the atria. When the maneuver is done correctly, blood pressure rises. This forces the heart to respond by correcting its rhythm and beating more slowly.
valsalva maneuver
The Valsalva maneuver can indeed induce strokes in the brain due to higher blood pressure in the head, and perhaps broken capillary blood vessels in the eyeballs and elsewhere. Do the maneuver only just as hard as needed to relieve your symptoms (by increasing heart rate, usually).
In all my years of SCUBA diving, this had never come up as a potential hazard. I was close to dismissing this question but a little googling shows that the Valsalva maneuver can, indeed, result in an elevated blood pressure. Seems to me that it would need to be some really aggressive Valsalva-ing and a susceptible individual for it to be dangerous. See the link for one opinion.
effect of penicillin and blood pressure medicine
high blood pressure
Valsalva maneuver Intra-abdominal pressure Compressive forces from muscle contractions Elevated cardiac output External compressive forces
It causes blood pressure to increase.
no
They constrict in order to try and maintain blood pressure.
Any activity that relieves stress or causes stress can have an effect on your blood pressure. If watching fish relieves stress for you, it can have the effect of lowering your blood pressure.
Baroreceptors respond to changes in blood pressure, detecting increases or decreases and sending signals to help regulate it. They are located in blood vessels, particularly in the walls of arteries.