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The fatigue properties of elastomeric materials highly depend on their microstructure. At a macro-scale, energy based criteria has proven to be efficient, but the understanding of the link to the microstructure is very difficult because of the numerous dissipation sources involved. The aim is here to understand what happens around a few inclusions and within a limited number of cycles (up to 2000), thanks to thermomechanical measurements at this scale. Reaching high enough spatial and thermal resolutions are therefore the two main difficulties encountered. As a first step, protocol and characterization tools of the thermal gradients has been developed on samples with geometric heterogeneities (hole or crack) and then applied on bad mixed samples (sample where inclusions are bigger than normally). Both loading cases at the macro and micro scales imply multiaxial mechanical conditions. The experimental fields of dissipated energy are finally compared to the ones obtained from numerical simulations.