Help Building biofeedback for muscle sensor / EMG with arduino

Hi hope someone can help me achieving this build, i am a newbee in electronics.

I am working with a research project in my hospital department, where i have to monitor the back muscle activity in scoliosis patients.
I have to record the EMG activity 4 different places ( 4 electrodes/channels), for 24h for like a whole week.

I have in mind to use an Arduino ( as small as possible ), some electrodes, and somekind of external storage, an SD card maybe.

i have been looking around in the internet but almost all projects involving EMG sensors are single channel and not storing in a card.

So please any advice on how i can approach the project ?, what will i need and eventually some suggestions about what i am intending to do.

Any help will be appreciated.

i have been looking around in the internet but almost all projects involving EMG sensors are single channel and not storing in a card.

Which EMG sensor are you planning to use? Whether you can use 4 of them, or not, depends on which sensor you are using. Storing the data in a file on an SD card is relatively simple.

Thanks for the answer .. i am thinking about Myoware ?

this is what i came with so far