Cross-spectral analysis of physiological tremor and muscle activity. I. Theory and application to unsynchronized EMG

Details Cross-spectral analysis of physiological tremor and muscle activity. I. Theory and application to unsynchronized EMG Cross-spectral analysis of physiological tremor and muscle activity. I. Theory and application to unsynchronized EMG

1998-05-08

arxiv.org/abs/chao-dyn/9805011v1

Nonlinear Sciences

Chaotic Dynamics

9 pages, 6 figures, to appear in Biological Cybernetics

Scientific paper

We investigate the relationship between the extensor electromyogram (EMG) and tremor time series in physiological hand tremor by cross-spectral analysis. Special attention is directed to the phase spectrum and the effects of observational noise. We calculate the theoretical phase spectrum for a second order linear stochastic process and compare the results to measured tremor data recorded from subjects who did not show a synchronized EMG activity in the corresponding extensor muscle. The results show that physiological tremor is well described by the proposed model and that the measured EMG represents a Newtonian force by which the muscle acts on the hand.

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