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Here's a quick reference. Not a lot of technical info on the instrumentation, but it'll at least give you an idea of the methodology.

EGG (electrogastrography) has been used clinically for over 20 years. It just takes a calm patient and a lot of signal conditioning...

I tried building a couple powered pre-amp/buffers using a JFET and op-amp to try and match impedance etc, but have not had much luck in getting a good signal. Running the guitar output directly into the mic-in and fiddling with the gain gives a surprisingly good result. Will have to experiment...

Surface EMG, or more precisely EGG, smooth muscle signals of the stomach and intestines. These tend to be very low frequency and amplitude, so a challenge to detect among the noise of skeletal muscles.

Does anyone have a simple pre-amp or buffer circuit to allow the input of an electric guitar signal to the Audio Shield line-in?

Just wondering if the Biopotential Signal Library using the ADS129x chip is still in development. I'm a gastroenterologist and can envision many potential clinical uses for a powerful, low cost system like this.