IEEE J Biomed Health Inform - Automatic identification and classification of muscle spasms in long-term EMG recordings.

Tópicos

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Resumo

Spinal cord injured (SCI) individuals may be afflicted by spasticity, a condition in which involuntary muscle spasms are common. EMG recordings can be analyzed to quantify this symptom of spasticity but manual identification and classification of spasms are time consuming. Here, an algorithm was created to find and classify spasm events automatically within 24-h recordings of EMG. The algorithm used expert rules and time-frequency techniques to classify spasm events as tonic, unit, or clonus spasms. A companion graphical user interface (GUI) program was also built to verify and correct the results of the automatic algorithm or manually defined events. Eight channel EMG recordings were made from seven different SCI subjects. The algorithm was able to correctly identify an average (?SD) of 94.5 ? 3.6% spasm events and correctly classify 91.6 ? 1.9% of spasm events, with an accuracy of 61.7 ? 16.2%. The accuracy improved to 85.5 ? 5.9% and the false positive rate decreased to 7.1 ? 7.3%, respectively, if noise events between spasms were removed. On average, the algorithm was more than 11 times faster than manual analysis. Use of both the algorithm and the GUI program provide a powerful tool for characterizing muscle spasms in 24-h EMG recordings, information which is important for clinical management of spasticity.

Resumo Limpo

spinal cord injur sci individu may afflict spastic condit involuntari muscl spasm common emg record can analyz quantifi symptom spastic manual identif classif spasm time consum algorithm creat find classifi spasm event automat within h record emg algorithm use expert rule timefrequ techniqu classifi spasm event tonic unit clonus spasm companion graphic user interfac gui program also built verifi correct result automat algorithm manual defin event eight channel emg record made seven differ sci subject algorithm abl correct identifi averag sd spasm event correct classifi spasm event accuraci accuraci improv fals posit rate decreas respect nois event spasm remov averag algorithm time faster manual analysi use algorithm gui program provid power tool character muscl spasm h emg record inform import clinic manag spastic

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