Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease

Evaluation of motor symptoms in Parkinson’s disease (PD) is still based on clinical rating scales by clinicians. Reaction time (RT) is the time interval between a specific stimulus and the start of muscle response. The aim of this study was to identify the characteristics of RT responses in PD patie...

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Main Authors: Do-Young Kwon, Byung Kyu Park, Ji Won Kim, Gwang-Moon Eom, Junghwa Hong, Seong-Beom Koh, Kun-Woo Park
Format: Article
Language:English
Published: Wiley 2014-01-01
Series:Parkinson's Disease
Online Access:http://dx.doi.org/10.1155/2014/848035
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author Do-Young Kwon
Byung Kyu Park
Ji Won Kim
Gwang-Moon Eom
Junghwa Hong
Seong-Beom Koh
Kun-Woo Park
author_facet Do-Young Kwon
Byung Kyu Park
Ji Won Kim
Gwang-Moon Eom
Junghwa Hong
Seong-Beom Koh
Kun-Woo Park
author_sort Do-Young Kwon
collection DOAJ
description Evaluation of motor symptoms in Parkinson’s disease (PD) is still based on clinical rating scales by clinicians. Reaction time (RT) is the time interval between a specific stimulus and the start of muscle response. The aim of this study was to identify the characteristics of RT responses in PD patients using electromyography (EMG) and to elucidate the relationship between RT and clinical features of PD. The EMG activity of 31 PD patients was recorded during isometric muscle contraction. RT was defined as the time latency between an auditory beep and responsive EMG activity. PD patients demonstrated significant delays in both initiation and termination of muscle contraction compared with controls. Cardinal motor symptoms of PD were closely correlated with RT. RT was longer in more-affected side and in more-advanced PD stages. Frontal cognitive function, which is indicative of motor programming and movement regulation and perseveration, was also closely related with RT. In conclusion, greater RT is the characteristic motor features of PD and it could be used as a sensitive tool for motor function assessment in PD patients. Further investigations are required to clarify the clinical impact of the RT on the activity of daily living of patients with PD.
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issn 2090-8083
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language English
publishDate 2014-01-01
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series Parkinson's Disease
spelling doaj-art-65826eddee5341e2ae7d1c4a63adac842025-02-03T06:12:32ZengWileyParkinson's Disease2090-80832042-00802014-01-01201410.1155/2014/848035848035Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s DiseaseDo-Young Kwon0Byung Kyu Park1Ji Won Kim2Gwang-Moon Eom3Junghwa Hong4Seong-Beom Koh5Kun-Woo Park6Department of Neurology, Korea University College of Medicine, Ansan Hospital, 516 Gojan-1-dong, Danwon-gu, Ansan-city, Gyeonggi-do 425-707, Republic of KoreaDepartment of Physical Medicine & Rehabilitation, Korea University College of Medicine, Ansan Hospital, 516 Gojan-1-dong, Danwon-gu, Ansan-city, Gyeonggi-do 425-707, Republic of KoreaSchool of Biomedical Engineering, Konkuk University, Seoul, Republic of KoreaSchool of Biomedical Engineering, Konkuk University, Seoul, Republic of KoreaDepartment of Control and Instrumentation Engineering, Korea University, Seoul, Republic of KoreaDepartment of Neurology, Korea University College of Medicine, Ansan Hospital, 516 Gojan-1-dong, Danwon-gu, Ansan-city, Gyeonggi-do 425-707, Republic of KoreaDepartment of Neurology, Korea University College of Medicine, Ansan Hospital, 516 Gojan-1-dong, Danwon-gu, Ansan-city, Gyeonggi-do 425-707, Republic of KoreaEvaluation of motor symptoms in Parkinson’s disease (PD) is still based on clinical rating scales by clinicians. Reaction time (RT) is the time interval between a specific stimulus and the start of muscle response. The aim of this study was to identify the characteristics of RT responses in PD patients using electromyography (EMG) and to elucidate the relationship between RT and clinical features of PD. The EMG activity of 31 PD patients was recorded during isometric muscle contraction. RT was defined as the time latency between an auditory beep and responsive EMG activity. PD patients demonstrated significant delays in both initiation and termination of muscle contraction compared with controls. Cardinal motor symptoms of PD were closely correlated with RT. RT was longer in more-affected side and in more-advanced PD stages. Frontal cognitive function, which is indicative of motor programming and movement regulation and perseveration, was also closely related with RT. In conclusion, greater RT is the characteristic motor features of PD and it could be used as a sensitive tool for motor function assessment in PD patients. Further investigations are required to clarify the clinical impact of the RT on the activity of daily living of patients with PD.http://dx.doi.org/10.1155/2014/848035
spellingShingle Do-Young Kwon
Byung Kyu Park
Ji Won Kim
Gwang-Moon Eom
Junghwa Hong
Seong-Beom Koh
Kun-Woo Park
Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease
Parkinson's Disease
title Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease
title_full Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease
title_fullStr Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease
title_full_unstemmed Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease
title_short Quantitative Electromyographic Analysis of Reaction Time to External Auditory Stimuli in Drug-Naïve Parkinson’s Disease
title_sort quantitative electromyographic analysis of reaction time to external auditory stimuli in drug naive parkinson s disease
url http://dx.doi.org/10.1155/2014/848035
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