yes, have a look at the graph here
https://en.wikipedia.org/wiki/Valsalva_maneuver see how pronounced the drop is.
This is for a person not exerting themselves. IF you are exerting yourself the graph would be a bit different, the recovery would be quicker as your heart rate would increase a lot and your blood pressure would also increase a lot, BP's of 300mmHg are not uncommon for lifting heavy.
Also don't read the bit about weightlifting further down that page .. its bullshit.