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Titolo:
Motor unit recruitment in the trapezius muscle with special reference to coarse arm movements
Autore:
Forsman, M; Birch, L; Zhang, QX; Kadefors, R;
Indirizzi:
Natl Inst Working Life, SE-40272 Gothenburg, Sweden Natl Inst Working Life Gothenburg Sweden SE-40272 272 Gothenburg, Sweden Chalmers Univ Technol, Dept Human Factors Engn, S-41296 Gothenburg, SwedenChalmers Univ Technol Gothenburg Sweden S-41296 41296 Gothenburg, Sweden Natl Inst Occupat Hlth, Dept Physiol, Copenhagen, Denmark Natl Inst Occupat Hlth Copenhagen Denmark Physiol, Copenhagen, Denmark Sahlgrens Univ Hosp, Dept Orthopaed, S-41345 Gothenburg, Sweden Sahlgrens Univ Hosp Gothenburg Sweden S-41345 S-41345 Gothenburg, Sweden
Titolo Testata:
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
fascicolo: 3, volume: 11, anno: 2001,
pagine: 207 - 216
SICI:
1050-6411(200106)11:3<207:MURITT>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTRACTIONS; MYALGIA; WORK; HUMANS;
Keywords:
shoulder myalgia; motor unit recruitment; EMG signal decomposition; wire electrodes; trapezius muscle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Forsman, M Natl Inst Working Life, POB 8850, SE-40272 Gothenburg, Sweden Natl Inst Working Life POB 8850 Gothenburg Sweden SE-40272 den
Citazione:
M. Forsman et al., "Motor unit recruitment in the trapezius muscle with special reference to coarse arm movements", J ELECTROMY, 11(3), 2001, pp. 207-216

Abstract

Chronic shoulder pain is common in a variety of occupations. The "Cinderella hypothesis" suggests that the pain originates from damaged type I musclefibres driven into degenerative processes as a result of too long activation and too short recovery time. The main purpose of this study was to investigate if the same motor units are active during all phases of coarse arm movements. Eight healthy volunteers participated in the study. Intramuscularelectromyographic signals were picked up with a four-lead fine wire electrode, during a unilateral straight arm movement. The movement started with either (part 1) an abduction or a flexion, then (2) a movement in the horizontal plane from the sagittal to the frontal plane or vice versa, and finally (3) an adduction or an extension to the start position. The movement cycle was performed in three different speeds, slow, medium, and high, with one, two or five cycles per 20 s, respectively. On an average, the motor unit action potentials (MUAPs) of 6 motor units (range, 1-15) were identified per trail. In total 94% of the MUAP trains that were identified showed firings in all 3 parts of the movements. The findings support the Cinderella hypothesis, although there is a need to further investigate the temporal pattern of long-term motor unit activity. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 01:18:09