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  4. Trunk muscle fatigue and associated EMG changes during a dynamic iso-inertial test
 
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Trunk muscle fatigue and associated EMG changes during a dynamic iso-inertial test

Publikationstyp
Journal Article
Date Issued
1997
Sprache
English
Author(s)
Morlock, Michael  
Biomechanik M-3  
Bonin, Veronika  
Biomechanik M-3  
Müller, Gerd
Biomechanik M-3  
Schneider, Erich  
Biomechanik M-3  
TORE-URI
https://hdl.handle.net/11420/46596
Journal
European journal of applied physiology  
Volume
76
Issue
1
Start Page
75
End Page
80
Citation
European Journal of Applied Physiology and Occupational Physiology 76 (1): 75-80 (1997)
Publisher DOI
10.1007/s004210050215
Scopus ID
2-s2.0-0030861930
This study was designed to investigate the relationship between trunk muscle fatigue and associated changes in the electromyographic (EMG) signals during a dynamic iso-inertial test. Eleven subjects performed dynamic trunk flexion/extension movements against 40% maximum voluntary contraction (MVC) torque until exhaustion in a tri-axial trunk dynamometer. EMG parameters in the time and frequency domain were studied by analysing changes of the signal amplitudes and the spectral density (using the zero-crossing-rate and the median frequency). The kinematics of the movement were analysed according to the movement velocities and the deviations from the required movement plane. The flexion and extension velocities decreased from the beginning to the end of the test. Movement deviations from the sagittal plane into the frontal and transverse plane increased with increasing test duration, as did the EMG amplitude. The median frequency during periods with maximum muscle activity decreased, as did the zero-crossing-rate. The increase in amplitude and decrease in median frequency were more pronounced in the trunk flexors than in the trunk extensors. The parameters of median frequency, zero-crossing-rate and amplitude seem to be sensitive identifiers of muscle fatigue during well-controlled dynamic contractions. While the kinematic data did not yield any information on the mechanisms of the fatigue, changes in the EMG parameters demonstrated that the duration of the test was limited by the fatigue of the trunk flexors.
Subjects
Electromyography
Exhaustion tests
Iso-inertial contractions
Localized muscular fatigue
DDC Class
570: Life Sciences, Biology
610: Medicine, Health
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