1 Computers in Biology and Medicine Real Time Identification of Active Regions in Muscles from High Density Surface Electromyogram Luca Mesin Mathematical Biology and Physiology, Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin, 10129, Italy. Running title: Real time localization of EMG sources Corresponding author: Luca Mesin, PhD Department of Electronics and Telecommunications, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 ITALY Tel. 0039-0110904085 Fax. 0039-0110904099 e-mail : luca.mesin@polito.it