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Titolo:
EXTRAPOLATION OF TIME-SERIES OF EMG POWER SPECTRUM PARAMETERS IN ISOMETRIC ENDURANCE TESTS OF TRUNK EXTENSOR MUSCLES
Autore:
VANDIEEN JH; HEIJBLOM P; BUNKENS H;
Indirizzi:
VRIJE UNIV AMSTERDAM,FAC HUMAN MOVEMENT SCI,AMSTERDAM SPINE UNIT,DE BOELELAAN 1085 NL-1081 HV AMSTERDAM NETHERLANDS DLO,IMAG,ERGON DEPT WAGENINGEN NETHERLANDS KATHOLIEKE UNIV LEUVEN,FAC PHYS EDUC & PHYSIOTHERAPY B-3001 LEUVEN BELGIUM
Titolo Testata:
Journal of electromyography and kinesiology
fascicolo: 1, volume: 8, anno: 1998,
pagine: 35 - 44
SICI:
1050-6411(1998)8:1<35:EOTOEP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
LUMBAR PARAVERTEBRAL MUSCLES; FIBER CONDUCTION-VELOCITY; LOW-BACK-PAIN; SURFACE ELECTROMYOGRAM; MUSCULAR FATIGUE; FREQUENCY; EXERCISE; CONTRACTION; STRENGTH; RECOVERY;
Keywords:
SURFACE ELECTROMYOGRAPHY; POWER SPECTRUM; TRUNK EXTENSORS; MUSCLE FATIGUE; ENDURANCE; LOW BACK PAIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
J.H. Vandieen et al., "EXTRAPOLATION OF TIME-SERIES OF EMG POWER SPECTRUM PARAMETERS IN ISOMETRIC ENDURANCE TESTS OF TRUNK EXTENSOR MUSCLES", Journal of electromyography and kinesiology, 8(1), 1998, pp. 35-44

Abstract

The aim of the present study was to test the viability of using shortisometric contractions of trunk extensor muscles to perform an assessment of their endurance capacity. To this aim two types of analysis were performed. First, electromyographic (EMG) mean power frequency (MPF) slopes with respect to time as estimated over shorter fixed periods were compared to slopes estimated over the full contraction period of a contraction sustained until the endurance time. Second, the relationship between MPF slope estimates as estimated over various periods andthe endurance time of the muscle group was evaluated. Five subjects performed three isometric trunk endurance tests at 25%, 50% and 75% of their maximum voluntary contraction (MVC), respectively. EMG signals of the left and right multifidus, iliocostalis and longissimus muscles were continuously recorded and spectral parameters were calculated. The MPF appeared to decrease consistently during all endurance tests. The extrapolation from a MPF time series of half the estimated contraction period to the time series of the complete contraction period gave reasonable results at all force levels, when data from several electrode locations were incorporated in a single slope estimate (mean or steepst slope). The accuracy of the prediction of trunk extensor enduranceon the basis of these parameters describing the MPF time series over half the estimated contraction period was satisfactory. Endurance timepredictions from yet shorter periods were unreliable. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 07:26:40