EMG signal morphology and kinematic parameters in essential tremor and Parkinson's disease patients.
The aim of this work was to differentiate patients with essential tremor from patients with Parkinson's disease. Electromyographic data from biceps brachii muscles and kinematic data from arms during isometric tension of the arms were measured from 17 patients with essential tremor, 35 patients with Parkinson's disease and 40 healthy controls. The EMG signals were divided to smaller segments from which histograms were calculated. The histogram shape was analysed with a feature dimension reduction method, the principal component analysis, and the shape parameters were used to differentiate between different subject groups. Three parameters, RMS-amplitude, sample entropy and peak frequency were determined from the kinematic measurements of the arms. The height and the side differences of the histogram were the most effective for differentiating between essential tremor and Parkinson's disease groups. The histogram parameters of patients with essential tremor were more similar to patients with Parkinson's disease than healthy controls. With this method it was possible to discriminate 13/17 patients with essential tremor from 26/35 patients with Parkinson's disease and 14/17 patients with essential tremor from 29/40 healthy controls. The kinematic parameters of patients with essential tremor were closer to parameters of patients with Parkinson's disease compared to healthy controls. Combining EMG and kinematic analysis did not increase discrimination efficiency but provided more reliability to the discrimination of subject groups.
Department of Applied Physics, The University of Eastern Finland, Kuopio, Finland. Electronic address: verneri.ruonala@uef.fi.
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Ruonala
The State University of Petrozavodsk, Petrozavodsk, Russian Federation.
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A
Meigal
Department of Applied Physics, The University of Eastern Finland, Kuopio, Finland.
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SM
Rissanen
Department of Physical Medicine and Rehabilitation, Kuopio University Hospital, Kuopio, Finland.
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O
Airaksinen
Department of Physical Medicine and Rehabilitation, Tampere University Hospital, Tampere, Finland.
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M
Kankaanpää
Department of Applied Physics, The University of Eastern Finland, Kuopio, Finland.
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PA
Karjalainen
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D004576:Electromyography / Q000379:methods*; D020329:Essential Tremor / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology; D010300:Parkinson Disease / Q000503:physiopathology*; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D055815:Young Adult
EMG; Essential tremor; Parkinson’s disease; Signal morphology