1 Submitted to Journal of Electromyography and Kinesiology 5 GEOMETRY ASSESSMENT OF ANAL SPHINCTER MUSCLE BASED 10 ON MONOPOLAR MULTICHANNEL SURFACE EMG SIGNALS Corrado Cescon 1* , Luca Mesin 1 , Michal Nowakowski 2 , Roberto Merletti 1 15 1 Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Dipartimento di Elettronica, Politecnico di Torino, Torino, Italy 2 Jagiellonian University School of Medicine, Krakow, Poland 20 Keywords: electromyography, monopolar detection, sphincter muscles Running title: Monopolar EMG signals from external anal sphincter 25 Corresponding author: *Corrado Cescon, Ph.D. LISiN, Dipartimento di Elettronica, Politecnico di Torino; Corso Duca degli Abruzzi 24, Torino, 10129 ITALY 30 Tel. 0039-011-4330476; Fax. 0039-0114330404; e-mail: corrado.cescon@polito.it Acknowledgements 35 This work was granted by Projects TASI (Else Kroner-Fresenius-Stiftung, Compagnia di San Paolo), and TIFNI (Regione Piemonte, Italy).