Document Detail

Cross-spectral analysis of physiological tremor and muscle activity. II. Application to synchronized electromyogram.
MedLine Citation:
PMID:  9691265     Owner:  NLM     Status:  MEDLINE    
We investigated the relationship between synchronized muscle activity and tremor time series in (enhanced) physiological tremor by cross-spectral analysis. Special attention was directed to the phase spectrum and its potential to clarify the contribution of reflex mechanisms to physiological tremor. The phase spectra are investigated assuming that the electromyogram (EMG) synchronization was caused by a reflex or a central oscillator. Comparing these results to phase spectra of measured data, we found a significant contribution of reflexes. But reflexes only modify existing peaks in the power spectrum. The main agents of physiological tremor are an efferent pace and the resonant behavior of the biomechanical system.
J Timmer; M Lauk; W Pfleger; G Deuschl
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Biological cybernetics     Volume:  78     ISSN:  0340-1200     ISO Abbreviation:  Biol Cybern     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-08-31     Completed Date:  1998-08-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7502533     Medline TA:  Biol Cybern     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  359-68     Citation Subset:  IM    
Zentrum für Datenanalyse und Modellbildung, Freiburg, Germany.
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MeSH Terms
Models, Biological
Motor Neurons / physiology
Muscle, Skeletal / physiopathology*
Nonlinear Dynamics
Reflex / physiology
Stochastic Processes
Tremor / physiopathology*

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