期刊
CLINICAL NEUROPHYSIOLOGY
卷 128, 期 10, 页码 1937-1945出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.clinph.2017.06.258
关键词
Cumulative distribution function; Isometric contraction; Autospectrum; EMG; Cervical dystonia
资金
- Ministry of Economic Affairs, Agriculture and Innovation
- Dutch Technology Foundation STW, Netherlands Organization for Scientific Research (NWO) [STW10736]
Objective: To identify effects of a deviant motor drive in the autospectral power of dystonic muscles during voluntary contraction in cervical dystonia patients.& para;& para;Methods: Submaximal (20%) isometric head-neck tasks were performed with the head fixed, measuring surface EMG of the sternocleidomastoid, splenius capitis and semispinalis capitis in CD patients and controls. Autospectral power of muscle activity, and head forces was analyzed using cumulative distribution functions (CDF). A downward shift between the theta/low alpha-band (3-10 H z) and the high alpha/beta-band (10-30 Hz) was detected using the CDF10, defined as the cumulative power from 3 to 10 Hz relative to power from 3 to 30 Hz.& para;& para;Results: CDF10 was increased in dystonic muscles compared to controls and patient muscles unaffected by dystonia, due to a 3-10 Hz power increase and a 10-30 Hz decrease. CDF10 also increased in patient head forces.& para;& para;Conclusions: Submaximal isometric contractions with the head fixed provided a well-defined test condition minimizing effects of reflexive feedback and tremor. We associate shifts in autospectral power with prokinetic sensorimotor control.& para;& para;Significance: Analysis of autospectral power in isometric tasks with the head fixed is a promising approach in research and diagnostics of cervical dystonia. (C) 2017 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
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