Hmmmm, parkinson's is not a disease of the muscle, so why look at one over another? It seems a bit mindless with some data collection but nothing more than that, mere observation that probably won't guide treatment as the results will be very individual, dependent on the time of day, the medication, what they ate the night before, how much sleep they had etc etc.

I like the idea of the emg in itself as a measure but why not try to make the data useful for something? Perhaps if you wish to measure a mm performance combine it with a change in medication, or compare it to a diet change or.......

I think your supervisor might get what I am at here. A study that adds to the better quality of treatment. I don't wish to sound patronising, just trying to share some ideas.