I have no idea! I do know that if I can find a place of serious concentration and really go into myself, I can stop labour from hurting and just feel it as a strong sensation, but I never tried it with blood pressure. I've never had to coz my bp is stupidly low at the best of times.
Only with very deep prayer & time, I find I can lower my heart rate.
Not sure if the blood pressure would be up....mine is always low to start with.
It would take maybe 10mins.....Could not do it on the spot,quickly.
I have never tried this before. This can probably be done on a short term basis. Naturally once you are still your heart will have less work to. To achieve long term success one would have to implement proper dieting measures.