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Titolo:
VOLUNTARY REDISTRIBUTION OF MUSCLE-ACTIVITY IN HUMAN SHOULDER MUSCLES
Autore:
PALMERUD G; KADEFORS R; SPORRONG H; JARVHOLM U; HERBERTS P; HOGFORS C; PETERSON B;
Indirizzi:
LINDHOLMEN DEV,POB 8714 S-40275 GOTHENBURG SWEDEN GOTHENBURG UNIV,EAST HOSP,DEPT ORTHOPAED S-41685 GOTHENBURG SWEDEN GOTHENBURG UNIV,SAHLGREN HOSP,DEPT ORTHOPAED S-41345 GOTHENBURG SWEDEN CHALMERS UNIV TECHNOL,CTR BIOMECH S-41296 GOTHENBURG SWEDEN
Titolo Testata:
Ergonomics
fascicolo: 4, volume: 38, anno: 1995,
pagine: 806 - 815
SICI:
0014-0139(1995)38:4<806:VROMIH>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
WORK; NECK; DISORDERS; FATIGUE; TASKS; LOAD;
Keywords:
ELECTROMYOGRAPHY; SHOULDER MUSCLES; BIOFEEDBACK; VOLUNTARY CONTROL; ERGONOMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
G. Palmerud et al., "VOLUNTARY REDISTRIBUTION OF MUSCLE-ACTIVITY IN HUMAN SHOULDER MUSCLES", Ergonomics, 38(4), 1995, pp. 806-815

Abstract

Four shoulder muscles (the supraspinatus, the infraspinatus, the anterior and middle portion of the deltoid, and the descending part of thetrapezius) were examined with electromyography in abducted arm positions. By using feedback techniques, we found that the subjects could reduce the EMG activity voluntarily by 22-47% in the trapezius muscle while keeping different static postures. This was not true for any othermuscle investigated. When the trapezius activity was reduced there was a tendency towards an increase of EMG activity in some other shoulder muscles, particularly the infraspinatus. The findings may be relatedto relaxation from an initial overstabilization of the shoulder, or redistribution of load among synergists. It is suggested that the possibility of reducing trapezius activity may be of ergonomic significance. It is also noted that EMG trapezius activity may not serve as a universal descriptor of total muscular load in the shoulder.

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Documento generato il 30/09/20 alle ore 09:40:45