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Titolo:
CONSEQUENCES OF TRAPEZIUS RELAXATION ON THE DISTRIBUTION OF SHOULDER MUSCLE FORCES - AN ELECTROMYOGRAPHIC STUDY
Autore:
PALMERUD G; SPORRONG H; HERBERTS P; KADEFORS R;
Indirizzi:
LINDHOLMEN DEV,POB 8714 S-40275 GOTHENBURG SWEDEN OSTRA HOSP,DEPT ORTHOPAED S-41685 GOTHENBURG SWEDEN GOTHENBURG UNIV,SAHLGRENS HOSP,DIV ORTHOPAED S-41345 GOTHENBURG SWEDEN CHALMERS UNIV TECHNOL,DEPT INJURY PREVENT S-41296 GOTHENBURG SWEDEN
Titolo Testata:
Journal of electromyography and kinesiology
fascicolo: 3, volume: 8, anno: 1998,
pagine: 185 - 193
SICI:
1050-6411(1998)8:3<185:COTROT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMUSCULAR PRESSURE; BIOMECHANICAL MODEL; ARM; SUPRASPINATUS; SUBSCAPULARIS;
Keywords:
ELECTROMYOGRAPHY; SHOULDER MUSCLES; BIOFEEDBACK; VOLUNTARY CONTROL; ERGONOMICS; BIOMECHANICS; SIMULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
G. Palmerud et al., "CONSEQUENCES OF TRAPEZIUS RELAXATION ON THE DISTRIBUTION OF SHOULDER MUSCLE FORCES - AN ELECTROMYOGRAPHIC STUDY", Journal of electromyography and kinesiology, 8(3), 1998, pp. 185-193

Abstract

This study was focused on the ability to reduce voluntarily the muscle activity in the descending part of the trapezius muscle without changing the arm position or hand load, and its consequences on the distribution of shoulder muscle forces. Visual feedback techniques were used. Six different arm positions were investigated in 11 subjects. Electromyography was used for monitoring the muscle involvement. The selection of relevant muscles was performed by a model simulation of the shoulder using a newly developed biomechanical model of the human shoulder. The ability to reduce the muscle activity of the descending part of the trapezius was confirmed and the reduction ranged from 60 to 76% depending on the arm position. Among the muscles studied the rhomboid major and minor and the transverse part of the trapezius were affected the most, increasing their activity on the average to 232. 175 and 201%respectively, compared to the initial activity. The anterior part of the deltoid and the medial part of the serratus anterior also intensified their activity. The influence on the levator scapulae was, contrary to simulation results and to empirical knowledge, a decrease of the muscle activity. It is suggested that attention is given to the rhomboids and the transverse part of the trapezius when muscle activity is reduced in the descending part of the trapezius, for instance in biofeedback-based therapy. In conclusion, the study showed that reducing thetrapezius activity caused a redistribution of muscle forces in the shoulder. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 15:32:45