Author/Editor		Dimanco, U; Farina, D; Coletti-Moja, M; Laterza, F; Matacchione, M; Merletti, R; Olcese, M; Rosso, MG
Title		Recruitment pattern analysis by surface EMG using linear arrays in normal subjects
Type		članek
Source		In: Stalberg EV, de Weerd AW, Zidar J, editors. ECCN 98. 9th European congress of clinical neurophysiology; 1998 Jun 4-7; Ljubljana. Bologna: Monduzzi editore,
Publication year		1998
Volume		str. 687-92
Language		eng
Abstract		The detection of the surface myoelectric signal (SEMG) with linear electrode arrays provides multiple observation points along the entire muscle. In this condition the propagatin effect is much more evident than in the case of two pairs of bipolar detection electrodes and it is possible to recognize and classify the single motor unit action potentials (MUAPs) using information from all channels, such as the position of the innervation zone(s), the lenght of the fibers, and the conduction velocity. Four eperimental sessions were performed on six halthy male adults with no history of neurological diseases. Ages ranged from 24 to 36, with a mean average of 29.7 years. All subjects were tested supine with the shoulder abducted to 90 degrees and forearm in vetical position placed in an isometric brace. A linear over array of sixteen electrodes, with interelectrode distance of 10 mm, was palced over the biceps brachii of the non dominant arm of each subject, aligned with the direction of the fibers. The subject was asked to perform four contractions in isometric conditions at 10%, 30%, 50% and 70% of the maximal voluntary contraction (MVC) sustained for 30 seconds. The signals have been analysed with software developed for the identification of the different MUAPs, based on a clustering technique. Results showed that it is possible to identify single motor unit action potentials even at high levels of contraction (50% and 70% MVC). Furthermore it was found that some motor units recruited after a few seconds at 30% MVC can also be recognized from the beginning of higher level contractions (50% and 70% MVC).(Abstract truncated at 2000 characters.)
Descriptors		ELECTROMYOGRAPHY MUSCLE CONTRACTION ADULT ISOMETRIC CONTRACTION