• Title/Summary/Keyword: Electromyography

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Motion and Force Estimation System of Human Fingers (손가락 동작과 힘 추정 시스템)

  • Lee, Dong-Chul;Choi, Young-Jin
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.10
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    • pp.1014-1020
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    • 2011
  • This presents a motion and force estimation system of human fingers by using an Electromyography (EMG) sensor module and a data glove system to be proposed in this paper. Both EMG sensor module and data glove system are developed in such a way to minimize the number of hardware filters in acquiring the signals as well as to reduce their sizes for the wearable. Since the onset of EMG precedes the onset of actual finger movement by dozens to hundreds milliseconds, we show that it is possible to predict the pattern of finger movement before actual movement by using the suggested system. Also, we are to suggest how to estimate the grasping force of hand based on the relationship between RMS taken EMG signal and the applied load. Finally we show the effectiveness of the suggested estimation system through several experiments.

OWAS and EMG-based Mason's Physical Workload Measurement (OWAS 및 근전도 기반 석공 작업부하 비교연구)

  • Seo, Byoung-Wook;Lim, Tae-Kyung;Lee, Dong-Eun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.194-195
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    • 2015
  • Methods for measuring the physical workload of construction workers are classified into posture assessment techniques (i.e., OWAS, RULA, etc.) and physiological measurement techniques (i.e., EMG, heart rate, etc.). The one does not quantify the workload on a specific body part of a worker by considering the weight of the hand tools or materials on hand and time for holding a particular posture. This paper presents a procedure for evaluating a physical demand using the electromyography (EMG) sensor. This study compares the EMG measurement and the posture assessment. The case study is carried out on a masonry operation.

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The use of kinesiologic electromyography (운동학적 근전도의 활용)

  • Won, Jong-Im
    • Journal of Korean Physical Therapy Science
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    • v.9 no.4
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    • pp.169-176
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    • 2002
  • The kinesiologic electromyograhy(KEMG) is one of the most common use in physical therapy for understanding normal function and dysfunction of the neuromuscular system. Physical therapists concerned to patterns of muscle response, position, type of muscle contraction, onset and cessation of activity, the level of muscle response in relation to effort, and type of muscle contraction. Also they are use KEMG to assess the exercises for facilitate or for inhibit specific muscle activity. However there is a few references that provide information of KEMG Thus, the purpose of this article is for the use and interpretation of KEMG data. This article will guide beginning researchers for collecting, managing and analyzing of KEMG data.

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A Study on Estimation of Scoliosis using Electromyography Sensor (근전도 센서를 이용한 척추측만증 추정에 관한 연구)

  • Choi, Dae-Yeong;Nam, Hyun-Do;Kim, Kyung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1231-1235
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    • 2016
  • In this study, it measures electromyogram to estimate scoliosis by using sensors in both sides of spinal erector muscle. A device is measured raw data to input mcu through a filter and amplifier. MCU is named "arduino" that is calculated muscle activity with algorithm by inputting data. By comparing with both sides of spinal erector muscle's activity, it studies about estimation of scoliosis

Arm Lifting Exercises for Lower Trapezius Muscle Activation

  • Kang, Minhyeok
    • Journal of International Academy of Physical Therapy Research
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    • v.10 no.4
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    • pp.1868-1872
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    • 2019
  • Background: Lower trapezius muscle function is important for the prevention and treatment of shoulder injuries. However, scapular posterior tilt movement has been overlooked in lower trapezius strengthening exercise programs. Objective: To examine the effects of prone arm lifting with scapular posterior tilt (PALSPT) on trapezius muscles. Design: Crossover study Methods: 17 healthy males were recruited for participation in this study. Participants performed backward rocking diagonal arm lifting (BRDAL) and PALSPT. To train participants in scapular posterior tilt movements for PALSPT, visual biofeedback of scapular movements was provided using a motion sensor. Electromyography (EMG) activities of the middle and lower trapezius were recorded using a surface EMG system. Differences in middle and lower trapezius muscle activity between BRDAL and PALSPT exercises were analyzed. Results: Lower trapezius muscle activity was significantly greater during PALSPT than during BRDAL (p=.006). Although greater EMG activity was observed in the middle trapezius during PALSPT than during BRDAL, this difference was not significant (p=.055). Conclusions: The results of the present study indicate that scapular posterior tilt movements must be considered in lower trapezius muscle strengthening programs.

Biomechanical Measuring Techniques for Evaluation of Workload (작업부하 평가를 위한 생체역학적 측정방법)

  • Kim, Jung-Yong;Park, Ji-Soo;Cho, Young-Jin
    • Journal of the Ergonomics Society of Korea
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    • v.29 no.4
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    • pp.445-453
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    • 2010
  • It is necessary to quantitatively evaluate the workload of workers in order to improve the level of safety and efficiency as well as to prevent workers from musculoskeletal disorders. The purpose of this study is to introduce biomechanical methods that are largely used to quantitatively evaluate workload. The biomechanical methods use kinematics and kinetics to analyze the movement and force of biomechanical body. Motion analysis, joint angle measurement, ground reaction force, mathematical model, and electromyography (EMG) were introduced as a tool or device for biomechanical evaluation. In this study, the special feature of each method was emphasized and important tips for field measurement were summarized. The information and technique disclosed in this summary can be used to evaluate and design the workplace better by effectively control the workload of field workers.

Surface Electromyographic Measure in Patients with Winging Scapula (익상견갑 환자의 표면근전도 검사)

  • Kim, Chul Hyun;Lee, Yang Soo;Lee, Yong Boem;Rho, Jae Hyun;Lee, Zee Ihn
    • Annals of Clinical Neurophysiology
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    • v.7 no.2
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    • pp.124-126
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    • 2005
  • The effect of serratus anterior dysfunction is seen in the scapular winging. We report 2 cases with winging scapula clinically but do not reveal denervation potentials in needle electromyography. Surface myoelectric measurements of median frequency and root mean square values show difference in fatigability and amplitude in affected side.

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A Measuring Method of Duration of Massteric Silent Period using mCFAR and CLMS filter (mCFAR 과 CLMS 필터를 이용한 교근의 휴지기 기간 측정법)

  • 김덕영;박중호;양덕진;강병길;김태훈;이영석;김성환
    • Journal of Biomedical Engineering Research
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    • v.20 no.6
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    • pp.601-607
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    • 1999
  • 상악(maxilla)과 하악(mandibular)의 최대 교합상태에서 하악을 기계적으로 자극(jaw jerk)할 경우 교근(masseter muscle)의 근전도 (electromyography)에서는 근신호가 일시적으로 침묵하는 형태의 휴지기(silent period) 현상이 발생한다. 턱관절 질환(temporo-mandibular joint dysfuntion)이 없는 정상인의 경우 24ms 정도의 휴지기가 나타나지만, 턱관절 질환 환자의 경우 평균 60ms 정도임을 볼 때 휴지기는 턱관절 질환을 진단하는 중요한 요소라 할 수있다. 본 논문에서는 이러한 휴지기 기간을 자동적으로 결정하기 위해 mCFAR 알고리즘을 제안하고 CLMS 적응 필터를 사용하여 근전도 신호의 왜곡을 가져오는 전원 잡음의 영향을 효과적으로 제거하였다. 실험 결과 전원 잡음에 대해 강건하며, 정확한 휴지기 기간을 결정할 수 있다.

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The Effect of Robo-horseback Riding Exercise on Trunk Muscle Activity Ratios in Patients with Low Back Pain

  • Kang, Hyungkyu;Chang, Sookyung
    • The Journal of Korean Physical Therapy
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    • v.24 no.6
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    • pp.393-397
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    • 2012
  • Purpose: We investigated to identify the effect of robo-horseback riding exercise (RHRE) on trunk muscle activity ratios for patients with low back pain. Methods: Twelve patients with low back pain and twelve healthy adults were recruited for this study. Subjects performed the RHRE with the neutral spine position. The amplitude of electromyography activity was recorded from the selected trunk muscles (internal oblique [IO], rectus abdominis [RA], multifidus [MF], the thoracic part of the iliocostalis lumborum [ICLT]). The ratios of the relative local muscle activity to the global muscle activity in abdominal and lumbar parts were calculated. Results: There were significant differences in the change values of the IO/RA and the MF/ICLT between low back pain (LBP) patients and healthy adults. The IO/RA ratio and the MF/ICLT ratio showed significant increase in LBP patients after training. Conclusion: The RHRE improved the trunk muscle activity ratio in patients with low back pain. The information presented here is important for investigators who use lumbar stabilization exercises as a rehabilitation exercise.

The Use of Electromyography for Fatigue Evaluation of Automotive Seats (자동차 시트의 피로도 평가를 위한 근전도 평가를 위한 근전도 측정기의 사용)

  • 이영신;이의신;박세진
    • Proceedings of the ESK Conference
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    • 1997.04a
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    • pp.10-16
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    • 1997
  • The ride comfort is one of the most important indices which decide the quality of automotive seats. A subjective evaluation is the general method for comfort evaluation of automotive seats. But the subjective evaluation assess the individual sensibility using questionnaire. Therefore, a need to develop methodologies to obtain objective measurements of the fatigue evaluation is evident. In an effort to monitor muscle activity during driving electromyography (EMG) was employed. In an experimental setting the subjective evaluation was conducted using questionnaire under the static conditions (8 subjects) and the fatigue was induced in muscles using EMG under the dynamic conditions (2 drivers). The resultant EMG signals were then sampled for three different muscles. In test involving 2 subjects of similar size and build, utilizing four different automotive seats, test results support the use of EMG to quantify muscular fatigue as a viable means of objective evaluation for the different automotive seats.

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