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Published in: Journal of Neural Transmission 8/2011

01-08-2011 | Movement Disorders - Original Article

Scaling analysis of bilateral hand tremor movements in essential tremor patients

Authors: S. Blesic, J. Maric, N. Dragasevic, S. Milanovic, V. Kostic, Milos Ljubisavljevic

Published in: Journal of Neural Transmission | Issue 8/2011

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Abstract

Recent evidence suggests that the dynamic-scaling behavior of the time-series of signals extracted from separate peaks of tremor spectra may reveal existence of multiple independent sources of tremor. Here, we have studied dynamic characteristics of the time-series of hand tremor movements in essential tremor (ET) patients using the detrended fluctuation analysis method. Hand accelerometry was recorded with (500 g) and without weight loading under postural conditions in 25 ET patients and 20 normal subjects. The time-series comprising peak-to-peak (PtP) intervals were extracted from regions around the first three main frequency components of power spectra (PwS) of the recorded tremors. The data were compared between the load and no-load condition on dominant (related to tremor severity) and non-dominant tremor side and with the normal (physiological) oscillations in healthy subjects. Our analysis shows that, in ET, the dynamic characteristics of the main frequency component of recorded tremors exhibit scaling behavior. Furthermore, they show that the two main components of ET tremor frequency spectra, otherwise indistinguishable without load, become significantly different after inertial loading and that they differ between the tremor sides (related to tremor severity). These results show that scaling, a time-domain analysis, helps revealing tremor features previously not revealed by frequency-domain analysis and suggest that distinct oscillatory central circuits may generate the tremor in ET patients.
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Metadata
Title
Scaling analysis of bilateral hand tremor movements in essential tremor patients
Authors
S. Blesic
J. Maric
N. Dragasevic
S. Milanovic
V. Kostic
Milos Ljubisavljevic
Publication date
01-08-2011
Publisher
Springer Vienna
Published in
Journal of Neural Transmission / Issue 8/2011
Print ISSN: 0300-9564
Electronic ISSN: 1435-1463
DOI
https://doi.org/10.1007/s00702-011-0581-1

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