• Title/Summary/Keyword: EMG monitoring

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Performance and Stability Evaluation of Muscle Activation (EMG) Measurement Electrodes According to Layer Design (근활성도(EMG) 측정 전극 레이어 설계에 따른 성능 및 안정성 평가)

  • Bon-Hak Koo;Dong-Hee Lee;Joo-Yong Kim
    • Science of Emotion and Sensibility
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    • v.26 no.4
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    • pp.41-50
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    • 2023
  • This study aims to develop electromyography (EMG) textile electrodes and assess their performance and signal stability by examining variations in layer count and fabric types. We fabricated the electrodes through layering and pressing techniques, focusing on configurations with different layer counts (Layer-0, Layer-1, and Layer-2). Our findings indicate that layer presence significantly influences muscle activation measurements, with enhanced performance correlated with increased layer numbers. Subsequently, we created electrodes from five distinct fabrics (neoprene, spandex cushion, 100% polyester, nylon spandex, and cotton canvas), each maintaining a Layer-2 structure. In performance tests, nylon spandex fabric, particularly heavier variants, outperformed others, while the spandex cushion electrodes showed superior stability in muscle activation signal acquisition. This research elucidates the connection between electrode performance and factors like layer number and electrode-skin contact area. It suggests a novel approach to electrode design, focusing on layer properties and targeted pressure application on specific sensor areas, rather than uniformly increasing sleeve pressure.

Implementation of a Bluetooth-LE Based Wireless ECG/EMG/PPG Monitoring Circuit and System (블루투스-LE 기반 심전도/근전도/맥박 무선 모니터링 회로 및 시스템 구현)

  • Lee, Ukjun;Park, Hyeongyeol;Shin, Hyunchol
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.6
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    • pp.261-268
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    • 2014
  • This paper presents a electrocardiogram(ECG), electromyogram(EMG), and Photoplethysmography(PPG) signal wireless monitoring system based on Bluetooth Low Energy (BLE). ECG and EMG sensor interface analog front-end circuits are designed by using off-the-shelf parts. Texas Instruments(TI)'s CC2540DK is used for BLE-based communication. Two CC2540DK modules are used as Peripheral and Central nodes. In peripheral device, vital signals are acquired by the analog front-ends and fed to ADC for analog-to-digital conversion. The peripheral transmitts the data through the air to the central device. The central device receive the data and sends them to PC using UART. GUI is designed using Labview for displaying the acquired vital signals. The developed system can be used for future ubiquitous wireless healthcare system based on bluetooth 4.0.

Study on Compressed Sensing of ECG/EMG/EEG Signals for Low Power Wireless Biopotential Signal Monitoring (저전력 무선 생체신호 모니터링을 위한 심전도/근전도/뇌전도의 압축센싱 연구)

  • Lee, Ukjun;Shin, Hyunchol
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.3
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    • pp.89-95
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    • 2015
  • Compresses sensing (CS) technique is beneficial for reducing power consumption of biopotential acquisition circuits in wireless healthcare system. This paper investigates the maximum possible compress ratio for various biopotential signal when the CS technique is applied. By using the CS technique, we perform the compression and reconstruction of typical electrocardiogram(ECG), electromyogram(EMG), electroencephalogram(EEG) signals. By comparing the original signal and reconstructed signal, we determines the validity of the CS-based signal compression. Raw-biopotential signal is compressed by using a psuedo-random matrix, and the compressed signal is reconstructed by using the Block Sparse Bayesian Learning(BSBL) algorithm. EMG signal, which is the most sparse biopotential signal, the maximum compress ratio is found to be 10, and the ECG'sl maximum compress ratio is found to be 5. EEG signal, which is the least sparse bioptential signal, the maximum compress ratio is found to be 4. The results of this work is useful and instrumental for the design of wireless biopotential signal monitoring circuits.

Development of Signal Process Software for Electromyograph(EMG) (근전기록장치의 신호처리 소프트웨어 개발)

  • Lee, Sangsik;Park, Wonyup;Lee, Choongho
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.3
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    • pp.17-22
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    • 2009
  • The objective of this study was to develop a signal process software for a Electromyograph(EMG). And this paper was developed to general signal process software for a Electromyograph using biomechanics. It was used the clinic, rehabilitation, ergonomics and sports. It was composed to the module type for the monitoring frequency analysis, the zero crossing and comparison analysis etc. It's UI(User Interface) made up the continuous monitoring, the reports and the user-friendly-approach. This developed Electromyography will be applied to biomedical engineering system.

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Visual Biofeedback to Monitor Serratus Anterior and Upper Trapezius Muscle Activities During Arm Lowering (팔 내리기 동작 시 시각적 바이오피드백 훈련이 전거근과 상부 승모근의 근활성도에 미치는 영향)

  • Ha, Sung-Min;Min, Kyung-Jin;Choi, Houng-Sik
    • Physical Therapy Korea
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    • v.15 no.2
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    • pp.38-43
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    • 2008
  • To reduce winging scapula, various exercise protocols have been widely used by clinicians. Selective serratus anterior strengthening, and restoring balanced function, are especially recommended to reduce winging scapula. The purpose of this study was to investigate visual biofeedback using a real time video camera display system for monitoring scapular winging during arm lowering. For this study, 13 males with winging scapular were recruited during arm lowering. Electromyography (EMG) activity was recorded from the serratus anterior (SA) and upper trapezius (UT) of the right side and compared with normal EMG activity using a paired t-test. The study showed, through visual biofeedback, that EMG activity significantly increased in the SA and significantly decreased in the UT (p<.05). These results suggest that visual biofeedback can be recommended as an effective method for scapular eccentric control, to prevent scapular winging during arm lowering.

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Relationship Between Electromyographic Activity of the Abductor Hallucis and the Pressure of a Pinch Gauge During Short Foot Exercise

  • Park, Kyung-Mi;Cynn, Heon-Seock;Choi, Houng-Sik
    • Physical Therapy Korea
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    • v.18 no.4
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    • pp.19-25
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    • 2011
  • The aims of this study were to investigate the correlation between the electromyographic (EMG) activity of the abductor hallucis (AbdH) and the amount of pressure measured by a pinch gauge (PG), and to compare the EMG activity of AbdH and the pressure measured by the PG during short foot (SF) exercise in subjects with pes planus and in subjects with a neutral foot alignment. Fourteen subjects were recruited for this study (pes planus group=7; neutral foot alignment group=7). A surface EMG was used to collect AbdH activity, and a PG was positioned under the first metatarsophalangeal joint to measure the pressure produced by the first metatarsal head during the SF exercise. The AbdH activity and the pressure measured by the PG showed a positive good correlation (r=.80, p<.05). The EMG activity of the AbdH and the pressure measured by the PG were significantly lower for subjects with pes planus than for subjects with a neutral foot alignment (p<.05). Based on these findings, the PG can be recommended as an effective instrument for evaluating the performance of the AbdH. It may also be beneficial for monitoring how well the SF exercise is performed, and for providing visual feedback to patients with pes planus during SF exercise in a clinical setting.

Principles of Intraoperative Neurophysiological Monitoring with Insertion and Removal of Electrodes (수술 중 신경계감시검사에서 검사에 따른 전극의 삽입 및 제거방법)

  • Lim, Sung Hyuk;Park, Soon Bu;Moon, Dae Young;Kim, Jong Sik;Choi, Young Doo;Park, Sang Ku
    • Korean Journal of Clinical Laboratory Science
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    • v.51 no.4
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    • pp.453-461
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    • 2019
  • Intraoperative neurophysiological monitoring (INM) examination identifies the damage caused to the nervous system during surgery. This method is applied in various surgeries to validate the procedure being performed, and proceed with confidence. The assessment is conducted in an operating room, using subdermal needle electrodes to optimize the examination. There are no textbooks or guides for the correct stimuli and recording areas for the surgical laboratory test. This article provides a detailed description of the correct stimuli and recording parts in motor evoked potential (MEP), somatosensory evoked potential (SSEP), brainstem auditory evoked potentials (BAEP) and visual evoked potentials (VEP). Free-running Electromyography (EMG) is an observation of the EMG that occurs in the muscle, wherein the functional state of most cranial nerves and spinal nerve roots is determined. In order to help understand the test, an image depicting the inserting subdermal needle electrodes into each of the muscles, is attached. Furthermore, considering both the patient and the examiner, a safe method is suggested for removal of electrodes after conclusion of the test.

Real time muscle fatigue monitoring by adaptive filtering algorithm (적응 필터링 알고리즘에 의한 근육 피로도의 실시간 측정)

  • 최영환;홍기릉;김성환
    • 제어로봇시스템학회:학술대회논문집
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    • 1987.10b
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    • pp.713-716
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    • 1987
  • A new approach to the real-time measurement of muscle fatigue by using adaptive filtering algorithm is proposed. Unlike previously reported methods, it can estimate the muscle fatigue at every sample as the EMG signal statistics change. As a result, the muscle conduction velocity ranged between 4.2-5m/s at low tension and 3-4m/s at fatigue state.

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Muscle Fatigue Monitoring Using Adaptive Digital Filter (적응 디지철 필터를 이용한 근육 피로도의 측정)

  • 최영환;변윤식;김철주;김성환
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.25 no.9
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    • pp.1074-1080
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    • 1988
  • A new approach to the measurement of muscle fatigue by adaptive digital filtering algorithm is proposed. Unlike previously reported methods, it can estimate the muscle fatigue at every sample as the EMG signal statistics change. As a result, the muscle conduction velocity ranged between 4.2-5m/s at low tension and 3-4m/s at fatigue state.

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Determination of Proper Monitor Height based on the Musculoskeletal Load and Preference during VDT Monitoring Tasks (VDT 모니터링 작업에서 근골격계 부담도 및 선호도에 근거한 모니터 높이 결정)

  • Lee, Joongho;Song, Young Woong;Na, Seokhee;Chung, Min Keun
    • Journal of Korean Institute of Industrial Engineers
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    • v.32 no.3
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    • pp.236-241
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    • 2006
  • Monitor height is one of the key factors in the VDT workstation design. Most of the previous studies have focused on traditional VDT workplace where the operators performed data entry or word processing tasks using single monitor. This study aimed to suggest proper monitor height when the main task was monitoring information from different number of information sources. Twelve male students participated in three experiments: single information source (one monitor), two information sources (one monitor and one CCTV), and three information sources (one monitor, one CCTV and a window). Subjects performed monitoring tasks for 10 minutes with 3 different monitor center heights : 89.0 cm (Low), 111.3 cm (Middle), and 124.8 cm (High). Surface EMG signals of five neck muscles, subjective discomfort ratings, preference, and working postures were recorded. Results indicated that the middle height was proper for one monitor condition, but the low monitor height was recommended for more than two information sources.