The increase in heart rate and blood pressure makes sense to me.
It mentions blood flowing from the extremities to the core organs and this is documented in seals. But their extremities are a small part of their total mass compared to us.
If the veins and arteries in our arms and legs become restricted, it seems logical that the only thing that could happen is pressure increased in the whole circulatory system. And to compensate for the decrease in 'pipe size" (hey, I"m a hatchery operator
) and maintain the flow rate, you have to increase the pump capacity, which in this case means the heart would have to pump faster.
Just thinking out loud here….this stuff is fascinating.


