FWIW, when I had one 2 months ago, I remember the first jolt being quite a shock (ahem), and the doc then "calibrated" the device so that he still could get meaningful readings without me trying to levitate to the ceiling. It was pretty much painless after that, only slightly uncomfortable.

I obviously don't know for sure if it was the calibration that did the trick.

That said, EMG's seem to be hit & miss, and certainly not the be-all diagnostics device for PN.