• Title/Summary/Keyword: Electromyography

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A Quantitative Analysis of Electromyography Obtained from Subjects Performing Seated Tasks (앉은 자세로 행하는 작업에서 측정된 근전도의 정량적 해석)

  • Son, Kwon
    • Journal of Biomedical Engineering Research
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    • v.13 no.1
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    • pp.9-18
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    • 1992
  • This paper describes a quantitative analysis of electromyography (EMG) measured from seven subjects performing four seated dynamic tasks. EMG signals were mom- bored using 15 surface electrodes which were placed on selected trunk and lower extrmity muscles of the right side of the body. Each EMG signal was then processed through rectification, integration, and filtering. Based on the maximum level of the processed EMG, it was found that the trunk and ankle muscles play an important role on the postural control during the seated tasks.

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Study on the EMG Signal Changes Depending on the Results of Restricted Cervical Rotation Test: Case Series Report (경추 회전제한 검사 결과에 따른 근전도 신호 변화: 증례보고)

  • Choi, Kwangho;Lee, Somin;Jerng, Ui Min;Kwon, O Sang;Lee, Young Jun;Jung, Jeeyoun
    • Journal of TMJ Balancing Medicine
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    • v.6 no.1
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    • pp.1-4
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    • 2016
  • We investigated the potential of electromyography (EMG) for diagnosing imbalance in the temporomandibular joint (TMJ) to apply functional cerebrospinal therapy (FCST). The electromyography signals were measured in the sternocleidomastoid muscle (SCM) in patients with temporomandibular disorder (TMD) while a FCST specialist conducted a restricted cervical rotation test. In addition, we also observed the changes in the electromyography signals according to pre-treatment or treatment with a TMJ balancing appliance (TBA), a customized TMJ balancing appliance (CBA), or a CBA with one paper bar. The right SCMs of the two patients with right TMJ imbalance had high EMG signals in the right cervical rotation test, while the left SCMs showed low EMG signals in the left rotation. In addition, the high EMG signals in the right SCMs decreased when using the TBA or the CBA, but the EMG signals of the left SCMs showed low EMG values during the treatments. Furthermore, the EMG signals of the right SCMs rose again after artificial imbalance of the right TMJ by the CBA with one paper bar. This case report demonstrated the potential of EMG as an objective diagnostic method for FCST.

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Study on an Electrode Attachment Method Suitable for Underwater Electromyography Measurements

  • Han, Seul-ki;Park, Jung-seo;Nam, Taek-gil
    • Journal of the Korean Society of Physical Medicine
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    • v.10 no.2
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    • pp.95-98
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    • 2015
  • PURPOSE: This study was conducted to devise a method of preventing water infiltration into the surface electrodes during EMG measurements underwater and on the ground and to check the reliability of Electromyography (EMG) measurements when underwater. METHODS: Six healthy adults were selected as subjects in this study. The measurements in this study were conducted in pool dedicated to underwater exercise and physical therapy room in the hospital building. An MP150 (Biopac Systems, US, 2010) and a BioNomadix 2-channel wireless EMG transmitter (Biopac Systems, US, 2012) was used to examine the muscle activity of rectus femoris, biceps femoris, tibialis anterior, gastrocnemius of dominant side. The subjects repeated circulation tasks on the ground for more than 10 min for enough surface electrode attachment movement. After a 15-min break, subjects performed the circulation task underwater(water depth 1.1m, water temperature $33.5^{\circ}C$, air temperature $27^{\circ}C$), as on the ground, for more than 10 min, and the MVIC of each muscle was measured again. SPSS v20.0 was used for all statistical computations. RESULTS: The maximum voluntary isometric contraction (MVIC) values between the underwater and on the ground measurements showed no significant differences in all four muscles and showed a high intraclass correlation coefficient (ICC) of >0.80. CONCLUSION: We determined that EMG measurements obtained underwater could be used with high reliability, comparable to ground measurements.

The Analysis of Erector Spinae Muscle on Difference of Functional Leg Length Inequality - through Meridian Electromyography (하지길이 차이에 따른 척추기립근의 분석 - 경근전도를 통해)

  • Yoon, Dae-Yeon;Choi, Jin-Seo;Jeong, Su-Hyun;Kim, Soon-Joong
    • Journal of Korean Medicine Rehabilitation
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    • v.21 no.3
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    • pp.13-20
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    • 2011
  • Objectives : We studied the clinical utility of meridian electromyography for the assessment of erector spinae muscle in functional leg length inequality. Methods : We compared electrical activity between A group with a functional leg length inequality(n=17) and B group(n=23) in dynamic flexion-reextension state during five minutes. We anayzed amplitudes and areas of electrical activity and asymmetry index(AI). Results : 1. The short leg sides were significantly higher electrical activity than the long leg sides in the experimental group and control group(p<0.05). 2. The AI of A group significantly higher than B group(p<0.05). Conclusions : According to above results, there are correlations between erector spinae muscle and functional leg length inequality.

Comparative Review on Oriental Medicine Study Utilized Surface Electromyography in Korea, China, Japan (표면근전도를 이용한 한국.중국.일본의 한의학연구 경향)

  • Lee, Hyung Geol;Im, Jeong Gyun;Jung, Da Jung;Kim, Jong Uk;Kim, Lak Hyung;Yook, Tae Han
    • Journal of Acupuncture Research
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    • v.30 no.1
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    • pp.23-34
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    • 2013
  • Background or Objectives : The purpose of this study is to review oriental medicine journal that have been utilize Surface EMG in Korea, China, Japan and compare each country's trend in studies. Methods : We investigated studies in relation to surface EMG through 10 articles in Korea from OASIS, 74 articles in China from CAJ, 6 articles in Japan from J-stage. Results : Of 90 articles, 6 articles in Korea, 7 article in China, 6 articles in Japan, totally 19 articles selected. There was no big differences number of articles, type of articles among three countries. There was differences topic of articles, treatment method of articles among three countries. Conclusion : The result of this study could provide useful information of field of Surface EMG is used in Oriental medicine. Studies about Surface EMG performed in different way in Korea, China, Japan.

Wrist and Grasping Forces Estimation using Electromyography for Robotic Prosthesis (근전도 신호를 이용한 손목 힘 및 악력 추정)

  • Kim, Young-Jin;Lee, Dong-Hyuk;Park, Hyeonjun;Park, Jae-Han;Bae, Ji-Hun;Baeg, Moon-Hong
    • The Journal of Korea Robotics Society
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    • v.12 no.2
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    • pp.206-216
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    • 2017
  • This paper proposes a method to simultaneously estimate two degrees of freedom in wrist forces (extension - flexion, adduction - abduction) and one degree of freedom in grasping forces using Electromyography (EMG) signals of the forearms. To correlate the EMG signals with the forces, we applied a multi - layer perceptron(MLP), which is a machine learning method, and used the characteristics of the muscles constituting the forearm to generate learning data. Through the experiments, the similarity between the MLP target value and the estimated value was investigated by applying the coefficient of determination ($R^2$) and root mean square error (RMSE) to evaluate the performance of the proposed method. As a result, the $R^2$ values with respect to the wrist flexion-extension, adduction - abduction and grasping forces were 0.79, 0.73 and 0.78 and RMSE were 0.12, 0.17, 0.13 respectively.

Temperature in Nerve Conduction and Electromyography (신경전도와 근전도검사에서의 체온)

  • Kim, Doo-Eung
    • Annals of Clinical Neurophysiology
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    • v.8 no.2
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    • pp.125-134
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    • 2006
  • Among the various physiological factors that affect nerve conduction velocity (NCV), temperature is the most important. Because the influence of temperature is the most important source of error. It is known from animal experiments that conduction is eventually completely blocked at low temperatures, the myelinated A fibers being the first affected and the thin fibers of group C the last. Many studies showed that the NCV decreases linearly with lowering temperature within the physiological range. The distal motor latency increased by $0.2msec/^{\circ}C$ drop in temperature between $25^{\circ}C$and $35^{\circ}C$ in the median, ulnar and peroneal nerves. The temperature affect the neuromuscular transmission; The miniature endplate potential (MEPP) and endplate potential (EPP) are increase with increasing temperature. In myasthenia gravis, the reduction in the decremental response is observed following cooling. The lowering temperature make increase the amplitude of sensory compound action potential; make enlarge the surface area of compound muscle action potential with very little increase in amplitude; make diminish the fibrillation potential and increase the myotonia in needle electromyography (EMG). Because of these findings mentioned above, the skin temperature should be routinely monitored and controlled during nerve conduction tests and needle EMG and should be taken into account when interpreting the findings.

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Clinical Application of Electromyography for Monitoring Procedure and Result of Orthodontic Treatment ; A of Three Cases (성장기 부정교합환자의 근신경계 부조화를 해소한 증례: 교정치료 과정과 결과를 모니터링하기 위한 근전도검사(EMG)의 임상적 응용)

  • Cha, Bong-Kuen;Lee, Nam-Ki;Choi, Dong-Soon;Kim, Sang-Ho
    • Journal of Dental Rehabilitation and Applied Science
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    • v.22 no.1
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    • pp.89-100
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    • 2006
  • Traditionally, goals of orthodontic treatment fall into four categories: good tooth alignment, improvement of skeletal profile and good soft tissue, and rehabilitation of the normal function. Electromyography (EMG) has proven as useful tool in evaluating masticatory function among the maxillomandibular relationship and could be useful in accompanying orthodontic treatment objectives. But in pursuit of clinical application, it is necceassry to systemize clinical guideline for diagnosis by EMG records in evaluating the effects of orthodontic, orthopedic, or surgical treatment. This study present 3 orthodontic cases, which treatment results, ie neuromuscular balances of masticatory muscle, could be moitered by EMG procedure.

The Clinical Usefulness of Laryngeal Electromyography(LEMG) for Differential Diagnosis of Traumatic Unilateral Vocal Cord Palsy -A Case Report- (후두외상으로 발생한 일측 성대 마비의 감별진단으로서 후두근전도검사의 유용성 -증례보고-)

  • 최홍식;김한수;김정홍;장정현
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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    • v.13 no.2
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    • pp.188-192
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    • 2002
  • Unilateral vocal cord palsy which is associated with laryngeal trauma is not uncommon event. In a 42-year-old male, a cricoid cartilage fracure had been developed after blunt trauma. The endoscopic findings showed contusion and diffuse swelling around the left arytenoid and false cord. During phonation, the mobility of left side true vocal cord was decreased. There were no level difference and displacement of the left side arytenoid. We used the laryngeal electromyography (LEMG) to make a differential diagnosis between the cricoarytenoid joint dislocation and the injury of recurrent laryngeal nerve. At the right thyroarytenoid muscle and cricothyroid muscle, the findings of LEMG were normal. But the amplitude and frequency during phonation were decreased (partial denervation) at the left thyroarytenoid muscle. LEMG is a very useful method to predict the diagnosis of vocal cord palsy.

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Laryngeal Evoked Electromyography with a Noninvasive Technique (비침습적 방법에 의한 후두유발근전도 검사)

  • 정성민;조선희;박기덕
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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    • v.10 no.1
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    • pp.30-36
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    • 1999
  • Background and Objectives : Laryngeal Evoked Electromyography(EEMG) is a objective, quantitative technique to determine innervation status of larynx. The possible applications of this technique are to confirm the etiology of impaired vocal fold motion and monitor perioperative vagus nerve trauma. The purpose of this study is to develop a novel method for determining the amount of reinnervation of recurrent laryngeal nerve with accurate, inexpensive, and minimally invasive technique in human. Materials and Methods : Laryngeal EEMG was performed for 16 adults with intact vocal folds motion and 2 patients diagnosed as unilateral vocal fold paralysis. for the purpose of searching what is the optimal and noninvasive technique for laryngeal EEMG, we used 2 types of stimulation configurations(transcutaneous vs percutaneous) and 2 types of recording configurations(intramuscular vs. surface). Results and Conclusions : Percutaneous needle stimulation and surface recording of laryngeal EEMG was reliable and comparable to standard needle stimulation and invasive intramuscular needle recording. But the laryngeal EEMG by the surface recording and transcutaneous surface stimulation was not reliable and repeatable. Therefore we recommended that laryngeal EEMG by surface recording and percutaneous needle stimulation would be minimally invasive, reliable technique to know the status of reinnervation in e patients with vocal fold paralysis.

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