I would likely volunteer.
I wrote a short story earlier this year that is kind of similar. (I was letting out a little steam from a post op appointment).
Basically it was about me as a student at a university who saw an ad in the hallway for an anxiety study.
I was really interested, hoping that maybe it would help me somehow, so I inquired.
Little did I know that I would be so distracted by how hot the Doctor was who was leading the study, I signed myself over to the biology department and I had all my deepest fears exposed as I was restrained, experimented on and monitored until I couldn't take it anymore.
^ I wish I could be a little more accurate with terms like all the different kind of scientists. Sometimes I get a bit carried away with fantasy because I don't actually know a lot beyond first aid and basic biology.
So yes, I love the idea of being hooked to an EKG machine or anything as simple as a BP cuff (which I actually find kind of painful and very annoying).
Even when I have to get blood taken or an ultrasound I wish I could be restrained and have the technicians take their time and taunt me.
Just the idea of a Doctor or scientist looking over me saying 'hm interesting' and reading whatever data they need off the machines, jotting things down on a clip board... Is too much for me.
I need to stop there. Lol.
Edit: this might also be relevant.
I am also a fan of pet play and I like to act as a house pet, I think a best cross over would be me as a bunny girl being experimented on. Not quite like animal testing (which I'm not a fan of, I think it's really disgusting and I'm sorry if that upset anyone to read) - but studying a little bunny girl instead. I think a scientist would be interested in how I behave and how similar to a human/animal I am.