I will only investigate the texture of the raw meat by applying a weight load on the meat pieces on a flat surface. I can then measure the thickness with a ruler. (the simpler the method the better). I will take many measurements so as to decrease uncertainties. Any advice on the cut of meat? Is it better to measure the mass before and after soaking as well?
I would use something like cross rib or flank. You need to have a control so measure before and after.
Also, what is your goal?
Just because a piece of meat is “tenderized” doesn’t mean it is good.
I would consider using organoleptic analysis along with any mechanical measurements.
I agree with Michael, you should add sensory evaluation to your study.
You could try with two different kind of beef cuts, like tenderloin (naturally tender) and brisket or shank.