Cold exposure causes peripheral vasoconstriction and demargination of white blood cells, knocking them into circulation.

“the cold part of it is going to cause vasil constriction and we know this in medicine we're actually taught this in medical school that a cold shower Vasa constriction causes demargination of the white blood cells that are actually attached to the inside of your blood vessels and it knocks them into circulation”

“so after a cold shower you will actually be able to see and this is kind of a trick question does one's white blood cell count go up after a a cold shower the answer is technically you have the same number of white cells but now they're just more of them in the circulation so yes the number that you get back on the Lab Test shows that it's gone up”

“yeah um this uh this phenomenon of of how the uh white blood cells are liberated by by cold and constriction yeah so when you have imagine a a tube that's lined with white blood cells they all have little poyes little things that attach and what happens when you have Vasa constriction is it causes Vasa constriction it shrinks down because of the smooth muscle muscle in the wall and you have release of these white blood cells into the circulation um and that's called demargination”