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The Sensitivity of Autoregressive Model Coefficient in Quantification of Trunk Muscle Fatigue During a Sustained Isometric Contraction

Title
The Sensitivity of Autoregressive Model Coefficient in Quantification of Trunk Muscle Fatigue During a Sustained Isometric Contraction
Author
김정룡
Keywords
muscle fatigue; autoregressive model coefficient; root mean square; zero crossing rate; mean power frequency; median frequency
Issue Date
2005-04
Publisher
ELSEVIER SCIENCE BV
Citation
INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS, v. 35, No. 4, Page. 321-330
Abstract
The goal of the study is to investigate the performance of the first autoregressive model coefficient (ARC) in quantification of fatigue of the trunk muscle. Other parameters such as root mean square (RMS), zero crossing rate (ZCR), mean power frequency (MPF), median frequency (MF) were computed and used for comparison with ARC in this study using slope and coefficient of determination of linear regression model fitted to the normalized parameter values in the time domain in order to assess sensitivity and reliability. Ten males were utilized and electromyographic (EMG) signals were collected at L3/L4 levels of both right and left erector spinae muscles continuously for a period of 20 s while subjects were isometrically extending their trunk at five different force levels: 15%, 30%, 45%, 60%, and 75% of maximal voluntary contraction (MVC). RMS was found to be the worst parameter, ARC was the most sensitive at 15-45% MVC and reliable at 15-60% MVC, and ZCR was more sensitive at 60-75% MVC but less reliable. The fourth order of the autoregressive (AR) model in 0.5 s intervals was validated for EMG signals and ARC may become an potential parameter to describe the trunk fatigue during both static and dynamic exertions.
URI
https://www.sciencedirect.com/science/article/pii/S0169814104001891http://repository.hanyang.ac.kr/handle/20.500.11754/110242
ISSN
0169-8141
DOI
10.1016/j.ergon.2004.08.011
Appears in Collections:
COLLEGE OF COMPUTING[E] > MEDIA, CULTURE, AND DESIGN TECHNOLOGY(ICT융합학부) > Articles
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