The redox driven swelling and deswelling of conducting polymers has been termed Electronic Muscle actuation. One application of this property is as a sphincter-like valve in a microfluidic system, where speed of response and magnitude of swelling is key (and largely determined by ion and solvent movement in the polymer). Here, we wish to use a methodology we developed to acquire time resolved NR profiles during redox cycling of polymer films in order to probe how fast and how deep into the polymer the mobile species go during swelling processes. It is hypothesised that, as with many other transport processes, these attributes strongly depend on polymer internal microstructure and thickness. The information gained will guide design and formulation of valves for an Electronically Programmable Microfluidic Fountain Array as well as provide insights in other sensor-like applications.