AR modeling of myoelectric interference signals during a ramp contraction.
IEEE Trans Biomed Eng
; 41(11): 1031-8, 1994 Nov.
Article
em En
| MEDLINE
| ID: mdl-8001992
ABSTRACT
We investigated the time-varying behaviour of the autoregressive (AR) parameters in a myoelectric (ME) signal detected during a linear force increasing contraction. The AR parameters of interest were the reflection coefficients, the AR model spectrum, and the prediction errors. We used well-conditioned ME signals for which the complete time record of the motor units firings was available. In addition, the influence of the recruitment of a new motor unit, the conduction velocity of action potentials, and additive broad-band noise were investigated using simulated ME signals. The simulated ME signals were constructed from a selected group of the available motor unit action potential trains. The results revealed that, as the contraction progressed, the AR parameters displayed a time-varying behavior which coincided with the recruitment of newly recruited motor units whose spectrum of the waveform differed from that of the rest of the ME signal. This property of the AR parameters was obscured by the presence of broad-band noise and low-amplitude motor unit action potentials, both of which are more pronounced during low-level force contractions.
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Base de dados:
MEDLINE
Assunto principal:
Simulação por Computador
/
Processamento de Sinais Assistido por Computador
/
Contração Isométrica
/
Modelos Biológicos
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
IEEE Trans Biomed Eng
Ano de publicação:
1994
Tipo de documento:
Article
País de afiliação:
Japão