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Cross-spectral analysis of physiological tremor and muscle activity

II Application to synchronized electromyogram

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Abstract

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.

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Authors and Affiliations

  1. Zentrum für Datenanalyse und Modellbildung, Eckerstr. 1, D-79104 Freiburg, Germany, , , , , , DE

    J. Timmer, M. Lauk & W. Pfleger

  2. Neurologische Universitätsklinik Kiel, Niemannsweg 147, D-24105 Kiel, Germany, , , , , , DE

    G. Deuschl

Authors
  1. J. Timmer
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  2. M. Lauk
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  3. W. Pfleger
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  4. G. Deuschl
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Received: 7 October 1996 / Accepted in revised form: 28 January 1988

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Timmer, J., Lauk, M., Pfleger, W. et al. Cross-spectral analysis of physiological tremor and muscle activity . Biol Cybern 78, 359–368 (1998). https://doi.org/10.1007/s004220050440

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  • DOI: https://doi.org/10.1007/s004220050440

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