A system and corresponding acquisition and analysis method of an individuals muscle activity, including at least an electromyographic acquisition section and a video acquisition section for acquiring through respective sensors at least first electric signals of an individuals muscle group and second digital video signals of the muscle group, a computer processor and user interface to provide an output processed by the computer processor, which itself includes an interface communicating with the electromyographic and video sections, a database of deductive rules and processing and analysis elements provided with an expert system employing an inferential motor for correlating the first and second signals applying the deductive rules specific of the methods and tools of artificial intelligence arranged in the database at least one detection sensor of the individuals skin impedence for determining an impedence value for use as correction parameter of the gain of the sensors of the electromyographic acquisition section.
