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Titolo:
EMG SIGNAL AMPLITUDE NORMALIZATION TECHNIQUE IN STRETCH-SHORTENING CYCLE MOVEMENTS
Autore:
ALLISON GT; MARSHALL RN; SINGER KP;
Indirizzi:
CURTIN UNIV,SCH PHYSIOTHERAPY,SELBY ST SHENTON PK WA 6008 AUSTRALIA UNIV WESTERN AUSTRALIA,DEPT HUMAN MOVEMENT NEDLANDS WA 6009 AUSTRALIA
Titolo Testata:
Journal of electromyography and kinesiology
fascicolo: 4, volume: 3, anno: 1993,
pagine: 236 - 244
SICI:
1050-6411(1993)3:4<236:ESANTI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTROMYOGRAPHIC TEMPORAL ANALYSIS; HUMAN SKELETAL-MUSCLE; GAIT; LOCOMOTION; EXERCISES; FATIGUE;
Keywords:
EMG; STRETCH-SHORTENING CYCLE; AMPLITUDE NORMALIZATION TECHNIQUE; MAXIMUM VOLUNTARY ISOMETRIC CONTRACTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
G.T. Allison et al., "EMG SIGNAL AMPLITUDE NORMALIZATION TECHNIQUE IN STRETCH-SHORTENING CYCLE MOVEMENTS", Journal of electromyography and kinesiology, 3(4), 1993, pp. 236-244

Abstract

Analysis of functional movements using surface electromyography (EMG)often involves recording both eccentric and concentric muscle activity during a stretch-shorten cycle (SSC). The techniques used for amplitude normalization are varied and are independent of the type of muscleactivity involved. The purpose of this study was: (i) to determine the effect of 11 amplitude normalization techniques on the coefficient of variation (CV) during the eccentric and concentric phases of the SSC; and (ii) to establish the effect of the normalization techniques on the EMG signal under variable load and velocity. The EMG signal of thebiceps brachii of eight normal subjects was recorded under four SSC conditions and three levels of isometric contraction. The 11 derived normalization values were total rms, mean rms and peak rms (100 ms time constant) for the isometric contractions and the mean rms and peak rmsvalues of the ensemble values for each set of isotonic contractions. Normalization using maximal voluntary isometric contractions (MVIC), irrespective of rms processing (total, mean or peak), demonstrated greater CV above the raw data for both muscle actions. Mean ensemble values and submaximal isometric recordings reduced the CV of concentric data. No amplitude normalization technique reduced the CV for eccentric data under loaded conditions. An ANOVA demonstrated significant (P<0.01) main effects for load and velocity on concentric raw data and an interaction (P<0.05) for raw eccentric data. No significant effects were demonstrated for changes in velocity when the data were normalized using mean rms values. The reduction of the CV should not be at the expense of true biological variance and current normalization techniques poorly serve the analysis of eccentric muscle activity during the SSC.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 23:48:45