Electrostim on spanked bottom?

Has anyone here tried a tens unit or other electrostim on a thoroughly spanked bottom? Does it hurt more and/or prolong the pain of the spanking?

I have, and I am assured it does.

I've not done that, but, I have had a bi-polar electrode in my ass on a steady pulse throb where my s/o at the time said he could see my anus/cheeks clenching from the pulses (clearly I could feel it). He timed the paddle swats in time with me clenching. I can tell you that does hurt more than being paddled on a relaxed butt.

During a rectal temp once.