"Jack"
Site policy is to use a real name for transactions in the forum. It is a courtesy to stop everyone looking like an idiot addressing a whisky bottle. Your email address does not have to be public, but it is known to the site moderators.

Anyway, a lot depends on your required accuracy and things.

My personal preferred technique for this would be a transformer ratio arm bridge (sometimes called a coaxial AC bridge), but the design techniques are very tricky.

IF these are LIVE (human ?) muscle samples, then your circuitry needs to be in a different class than something a hobbyist lashes up on a bench.

A TRAB has the great benefit of being FULLY isolated from the drive and detector, and they can work with "stray" reactances >>10^6 times the signal.

What is the application ?

Steve