• Title/Summary/Keyword: Electromyography

Search Result 1,127, Processing Time 0.025 seconds

Human-Machine Interaction based on a Real-time Upper Limb Motion Prediction using Surface Electromyography (표면 근전도 신호를 이용한 실시간 상지부 동작 예측을 통한 인간-기계 상호작용)

  • Kwon, Sun-Cheol;Kim, Jung
    • 한국HCI학회:학술대회논문집
    • /
    • 2009.02a
    • /
    • pp.418-421
    • /
    • 2009
  • This paper presents a human-machine interaction based on a realtime upper limb motion prediction method using surface electromyography (sEMG). The motions were predicted using an artificial neural network algorithm and sEMG signals which are acquired from five muscles, and then a manipulator was controlled to follow after the predicted motions. Upper limb motions were restricted to 2D vertical plane with the contact condition between a user and an end-effector of manipulator. In order to demonstrate the feasibility of the proposed method, experiments using developed method and using a goniometer were performed. The results showed that the proposed real-time motion prediction method can be implemented a human-machine interaction system.

  • PDF

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
    • /
    • v.12 no.2
    • /
    • pp.206-216
    • /
    • 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.

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
    • /
    • v.10 no.1
    • /
    • pp.30-36
    • /
    • 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.

  • PDF

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
    • /
    • v.30 no.1
    • /
    • pp.23-34
    • /
    • 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.

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
    • /
    • v.21 no.3
    • /
    • pp.13-20
    • /
    • 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.

Temperature in Nerve Conduction and Electromyography (신경전도와 근전도검사에서의 체온)

  • Kim, Doo-Eung
    • Annals of Clinical Neurophysiology
    • /
    • v.8 no.2
    • /
    • pp.125-134
    • /
    • 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.

  • PDF

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
    • /
    • v.10 no.2
    • /
    • pp.95-98
    • /
    • 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 Comparison of Muscle Contraction Time and Modulation Ratio during Reaching Tasks in Hemiparalysis, Elderly and Young Adults

  • Sun, Jeon;Park, Dae-Sung
    • Physical Therapy Rehabilitation Science
    • /
    • v.11 no.2
    • /
    • pp.145-153
    • /
    • 2022
  • Objective: The purpose of this study was to evaluate the Electromyography (EMG) of the upper limb during reaching tasks according to two heights in the sitting position. Design: Cross sectional design Methods: Fifteen hemiplegia, fifteen elderly, and fifteen healthy subjects have participated in this study. The targets (90% length of the subject's arm) were located at the two heights (the eye and xiphoid process). We have recorded EMG signals of seven upper limb muscles (anterior deltoid (AD), posterior deltoid (PD), pectoralis major (Pec), infraspinatus (Inf), supraspinatus (Sup), biceps brachii (Bi), triceps brachii (Tri)). The dependent variables were movement time(s), modulation ratio, working ratio, and the co-contraction ratio of the hemiplegia, elderly, and healthy at the reaching task. Two-way repeated-measures ANOVA (2-heights) was analyzed with the LSD post hoc test. Results: The study results were as follows: (1) The movement time to the target during reaching movement was significantly longer for the hemiplegia and elderly groups compared to the healthy group. (2) The modulation rate was significantly higher at eye height than the xiphoid height in AD, PD, Pec, Inf, Bi muscles, and the hemiplegia group and elderly group were significantly lower than the healthy group. Additionally, the modulation ratio showed a significant interaction between heights and groups. Conclusions: It is expected that the variables using the muscle contraction characteristics, the evaluation method of this study, can be used as an electromyography-based feedback method that can be objectively evaluated and quantified in clinical practice.

Correlation between Surface Electromyography and Conventional Electromyography in Facial Nerve Palsy (안면마비 환자에서 표면 근전도 검사와 통상적 근전도 검사간 상관관계)

  • Jang, Haneul;Yoo, Seung Don;Lee, Jong Ha;Soh, Yunsoo;Kim, Dong Hwan;Chon, Jinmann;Lee, Seung Ah;Kim, Hee-Sang;Yun, Dong Hwan;Kwon, Jung Ho
    • Journal of Electrodiagnosis and Neuromuscular Diseases
    • /
    • v.20 no.2
    • /
    • pp.84-90
    • /
    • 2018
  • Objective: To assess the correlation between surface electromyography (SEMG) and conventional EMG in patients with facial nerve palsy. Additionally, compare the discomfort and the time required by the patients in two methods. Method: 36 patients with facial palsy were given nerve conduction studies (NCS) via conventional EMG. Then, the peak root mean square (RMS) values were obtained from the SEMG. We also recorded visual analogue scale (VAS), House-Brackmann scale, and the time required for the examination. Results: Pearson's correlation coefficient between the amplitude loss ratio of the RMS values obtained by SEMG compared to the unaffected side (RSEMG) and the amplitude loss ratio of CMAP amplitudes compared to the unaffected side (RCMAP) was 0.567 at the frontalis, 0.456 at the orbicularis oculi, 0.393 at the nasalis, and 0.437 at the orbicularis oris. An increase in RSEMG is positively correlated with an increase in RCMAP. The mean VAS score with conventional EMG was $3.55{\pm}1.42$, whereas that experienced when using SEMG was $0.11{\pm}0.52$ and the mean time required for conventional EMG was $610{\pm}103.84$ seconds, while that required for SEMG was $420{\pm}86.32$ seconds. Conclusion: This study demonstrated a significant positive correlation between facial muscle activities as measured by SEMG and conventional EMG in patients with facial nerve palsy. SEMG has the benefits of being more comfortable and faster when diagnosing facial palsy.