Počet záznamů: 1

Intermittent bilateral coherence in physiological and essential hand tremor

  1. 1.
    0474149 - FGU-C 2018 RIV IE eng J - Článek v odborném periodiku
    Chakraborty, Soma - Kopecká, J. - Šprdlík, Otakar - Hoskovcová, M. - Ulmanová, O. - Růžička, E. - Zápotocký, Martin
    Intermittent bilateral coherence in physiological and essential hand tremor.
    Clinical Neurophysiology. Roč. 128, č. 4 (2017), s. 622-634 ISSN 1388-2457
    Grant CEP: GA ČR(CZ) GBP304/12/G069
    Institucionální podpora: RVO:67985823 ; RVO:67985556
    Klíčová slova: physiological tremor * essential tremor * bilateral coupling * coherence * ballistocardiac impulse * accelerometry * wavelet analysis
    Kód oboru RIV: FH - Neurologie, neurochirurgie, neurovědy
    Impakt faktor: 3.866, rok: 2016

    We investigated the prevalence and the temporal structure of bilateral coherence in physiological (PT) and essential (ET) hand tremor. Triaxial accelerometric recordings from both hands in 30 healthy subjects and 34 ET patients were analyzed using spectral coherence and wavelet coherence methods. In 12 additional healthy subjects, the relation between the hand tremor and the chest wall acceleration was evaluated using partial coherence analysis. The majority of both PT and ET subjects displayed significant bilateral coherence. While in PT, bilateral coherence was most frequently found in resting hand position (97% of subjects), in ET the prevalence was comparable for resting (54%) and postural (49%–57%) positions. In both PT and ET, epochs of strong coherence lasting several to a dozen seconds were separated by intervals of insignificant coherence. In PT, bilateral coherence at the main tremor frequency (8–12 Hz) was coupled with the ballistocardiac rhythm. The oscillations of the two hands are intermittently synchronized in both PT and ET. We propose that in postural PT, bilateral coherence at the main tremor frequency arises from transient simultaneous entrainment of the left and right hand oscillations to ballistocardiac forcing. Bilateral coherence of hand kinematics provides a sensitive measure of synchronizing influences on the left and right tremor oscillators.
    Trvalý link: http://hdl.handle.net/11104/0271260