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Titolo:
The effects of four time-varying factors on the mean frequency of a myoelectric signal
Autore:
Cechetto, AD; Parker, PA; Scott, RN;
Indirizzi:
Univ New Brunswick, Inst Biomed Engn, Fredericton, NB E3B 5A3, Canada UnivNew Brunswick Fredericton NB Canada E3B 5A3 cton, NB E3B 5A3, Canada Univ New Brunswick, Dept Elect & Comp Engn, Fredericton, NB E3B 5A3, Canada Univ New Brunswick Fredericton NB Canada E3B 5A3 cton, NB E3B 5A3, Canada
Titolo Testata:
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
fascicolo: 5, volume: 11, anno: 2001,
pagine: 347 - 354
SICI:
1050-6411(200110)11:5<347:TEOFTF>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUSTAINED ISOMETRIC CONTRACTIONS; SURFACE EMG AMPLITUDE; POWER SPECTRUM; DYNAMIC CONTRACTIONS; INCREASING FORCE; MEDIAN FREQUENCY; MUSCLE TENSION; FIRING RATE; ELECTROMYOGRAM; DEPENDENCE;
Keywords:
biceps brachii; firing rate; force; joint angle; mean frequency; muscle fatigue; myoelectric signal;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Parker, PA Univ New Brunswick, Inst Biomed Engn, POB 4400, Fredericton, NBE3B 5A3, Canada Univ New Brunswick POB 4400 Fredericton NB Canada E3B 5A3 anada
Citazione:
A.D. Cechetto et al., "The effects of four time-varying factors on the mean frequency of a myoelectric signal", J ELECTROMY, 11(5), 2001, pp. 347-354

Abstract

Daily activities involve dynamic muscle contractions that yield nonstationary myoelectric signals (MESs). The purpose of this work was to determine the individual effects of four time-varying factors (the number and firing rate of active motor units, muscle force and joint angle) on the mean frequency of a MES. Previous theoretical and experimental work revealed that although changes in the number and firing rate of active motor units contributeto the nonstationarities of the signal, they do not significantly affect the mean frequency. In the experimental work, 12 subjects performed 25 static contractions, one for each force (20, 30, 40, 50 and 60% of maximum voluntary contraction) and elbow joint angle (50, 70, 90, 110 and 130 degrees extension) combination. A MES was recorded from the surface of the biceps brachii during each contraction. The results indicated that muscle force only weakly affects the mean frequency. Also shown was that alteration in musclegeometry resulting from changes in elbow joint angle does significantly affect the mean frequency. Knowing this is important for the assessment of muscle fatigue during dynamic contractions. (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 28/03/20 alle ore 10:40:12