Hi @damewocane - I haven't had an EMG but I'm going to share some information that @johnbishop posted. He may be able to add some information - and maybe others who have experienced this.
https://www.mayoclinic.org/tests-procedures/emg/about/pac-20393913?_ga=2.147873911.170155776.1569448063-1531702906.1512411564
I hope it goes well for you. Will you keep me posted?