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Titolo:
Reproducibility of surface EMG during dynamic shoulder forward flexions: astudy of clinically healthy subjects
Autore:
Larsson, B; Karlberg, C; Elert, J; Gerdle, B;
Indirizzi:
Fac Hlth Sci, Dept Rehabil Med, S-58185 Linkoping, Sweden Fac Hlth Sci Linkoping Sweden S-58185 bil Med, S-58185 Linkoping, Sweden Linkoping Univ Hosp, Pain & Rehabil Ctr, S-58185 Linkoping, Sweden Linkoping Univ Hosp Linkoping Sweden S-58185 , S-58185 Linkoping, Sweden
Titolo Testata:
CLINICAL PHYSIOLOGY
fascicolo: 5, volume: 19, anno: 1999,
pagine: 433 - 439
SICI:
0144-5979(199909)19:5<433:ROSEDD>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEAN POWER FREQUENCY; PEAK TORQUE; TEST-RETEST; RELIABILITY; CONTRACTIONS; ELECTROMYOGRAPHY; STABILITY; AMPLITUDE; ENDURANCE; STRENGTH;
Keywords:
EMG; mean frequency; peak torque; reliability; reproducibility; RMS; shoulder; trapezius;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Gerdle, B Fac Hlth Sci, Dept Rehabil Med, S-58185 Linkoping, Sweden Fac Hlth Sci Linkoping Sweden S-58185 -58185 Linkoping, Sweden
Citazione:
B. Larsson et al., "Reproducibility of surface EMG during dynamic shoulder forward flexions: astudy of clinically healthy subjects", CLIN PHYSL, 19(5), 1999, pp. 433-439

Abstract

There is a shortage of studies concerning the reproducibility of surface electromyography (EMG) during dynamic contractions. The movement per se introduces factors that could have the potential to affect the characteristics of the electromyogram. The aim of this study was to investigate the during-the-day reproducibility (using intra-class coefficient, ICC) of the peak torque (PT) and the EMG variables (without removing electrodes) of dynamic shoulder forward flexions. Eleven healthy women performed three sets of 10 dynamic maximum right-shoulder flexions at Ih intervals using an isokinetic dynamometer. The PT of each flexion was determined. EMG signals were recorded from four muscles (trapezius, deltoid, infraspinatus and biceps brachii) using surface electrodes, and the mean frequency of the power spectrum (MNF[Hz]) and the signal amplitude (RMS [mu V]), were computed. The ability torelax between maximum flexions was calculated as a ratio between the RMS during the passive extension phase and the RMS during the active flexion phase of each contraction cycle. This ratio is the signal amplitude ratio (SAR). The present study showed good reproducibility for PT, MNF and RMS, whilethe reproducibility of SAR was generally acceptable (fair) according to the criteria used.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 08:02:49