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Titolo:
EMG MEAN POWER FREQUENCY - OBTAINING A REFERENCE VALUE
Autore:
OBERG T; SANDSJO L; KADEFORS R;
Indirizzi:
UNIV JONKOPING,COLL HLTH SCI,DEPT BIOMECH S-55111 JONKOPING SWEDEN LINKOPING UNIV,DEPT ORTHOPED LINKOPING SWEDEN CHALMERS UNIV TECHNOL,DEPT APPL ELECTR S-41296 GOTHENBURG SWEDEN LINDHOLMEN DEV CTR GOTHENBURG SWEDEN
Titolo Testata:
Clinical biomechanics
fascicolo: 4, volume: 9, anno: 1994,
pagine: 253 - 257
SICI:
0268-0033(1994)9:4<253:EMPF-O>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOCALIZED MUSCLE FATIGUE; TRAPEZIUS MUSCLE; ELECTROMYOGRAM;
Keywords:
EMG; FREQUENCY; NORMALIZATION; REFERENCE VALUE; VARIABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
T. Oberg et al., "EMG MEAN POWER FREQUENCY - OBTAINING A REFERENCE VALUE", Clinical biomechanics, 9(4), 1994, pp. 253-257

Abstract

Normalization of the electromyographic mean power frequency is generally performed on the basis of single estimates. Random variation of reference values based on such single estimates can seriously impair data reported in normalized form. In the present study we have examined five procedures for calculation of an initial reference value: calibration contractions at 0-kg (repeated) and 2-kg hand load, and regressionroutines at 0-kg and 2-kg hand load. There was a large between-subject variation if all different routines were considered, a moderate between-routine variation, and a quite small within-subject variation. Thecorrelation between the different routines was high. At the same loadlevel calibration and regression routines gave equivalent results, but the variability was less at the higher load level. The variations found are of such a magnitude that it is necessary to reduce the influence of random variation. Procedure proposed for reduction of this variability is repeated calibration measurements. A preferred test positionfor the trapezius muscle is straight arm, 90 degrees of abduction in the scapular plane, 2-kg hand load. Relevance The results are important for all who use spectral parameters to estimate localized muscle fatigue in biomechanics, ergonomics, and kinesiology.

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Documento generato il 29/09/20 alle ore 03:52:32