• Title/Summary/Keyword: Electromyography

Search Result 988, Processing Time 0.084 seconds

Designing a Snow-removing Tool Through Ergonomic Approach

  • Jung, Kwang Tae;Nam, Jung Min
    • Journal of the Ergonomics Society of Korea
    • /
    • v.35 no.5
    • /
    • pp.439-447
    • /
    • 2016
  • Objective: The purpose of this study is to design a snow-removing tool using an ergonomic approach. Background: It is necessary to remove snow on the garden of a house or side street to prevent a fall hazard. When a user removes snow using a snow-removing tool, he or she experiences lots of physical discomfort. Therefore it is necessary to design a snow-removing tool to reduce a user's physical discomfort. Method: In this study, a new design for a snow-removing tool was developed considering user needs. The design prototype was compared with an existing tool through electromyography and subjective evaluation. Results: From the comparison evaluation, significant differences between the new design and the existing tool were identified in both muscle fatigue and subjective rating of discomfort. Conclusion: The result showed that the new design is better from the aspect of easing physical discomfort. Application: A new snow-removing tool can be developed using the design so that it can reduce a user's physical discomfort.

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
    • /
    • v.17 no.10
    • /
    • pp.1014-1020
    • /
    • 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.

Lumbar burner and stinger syndrome in an elderly athlete

  • Wegener, Veronika;Stabler, Axel;Jansson, Volkmar;Birkenmaier, Christof;Wegener, Bernd
    • The Korean Journal of Pain
    • /
    • v.31 no.1
    • /
    • pp.54-57
    • /
    • 2018
  • Burner or stinger syndrome is a rare sports injury caused by direct or indirect trauma during high-speed or contact sports mainly in young athletes. It affects peripheral nerves, plexus trunks or spinal nerve roots, causing paralysis, paresthesia and pain. We report the case of a 57-year-old male athlete suffering from burner syndrome related to a lumbar nerve root. He presented with prolonged pain and partial paralysis of the right leg after a skewed landing during the long jump. He was initially misdiagnosed since the first magnet resonance imaging was normal whereas electromyography showed denervation. The insurance company refused to pay damage claims. Partial recovery was achieved by pain medication and physiotherapy. Burner syndrome is an injury of physically active individuals of any age and may appear in the cervical and lumbar area. MRI may be normal due to the lack of complete nerve transection, but electromyography typically shows pathologic results.

Comparison of Bimanual and Unimanual Movements on Muscle Activity in Healthy Adults (정상인에서 양손 및 한손 움직임 시 근활성도 비교)

  • Kim, Taehoon
    • Journal of The Korean Society of Integrative Medicine
    • /
    • v.6 no.1
    • /
    • pp.75-81
    • /
    • 2018
  • Purpose : The aim of this study was to compare the muscle activities of thumb and wrist during unimanual, bimanual symmetric and bimanual reciprocal movements using surface electromyography. Method : Thirty-six participants were involved in this study. Two blocks were used to perform unimanual, bimanual symmetric and bimanual reciprocal movements of thumb and wrist. Muscle activities in the flexor pollicis brevis, abductor pollicis brevis, extensor carpi radialis and flexor carpi radialis were measured using an surface EMG system. Result : For the flexor pollicis brevis and abductor pollicis brevis, significant difference in the muscle activity were found among the unimanual, bimanual symmetric and bimanual reciprocal movement. For the extensor carpi radialis and flexor carpi radialis, the unimanual movement significantly different from the bimanual symmetric and reciprocal movements. Conclusion : Both the thumb and wrist, bimanual symmetric and reciprocal movements were more efficient than the unimanual movement. Moreover, with regard to the thumb, the bimanual reciprocal movement was more efficient than the bimanual symmetric movement.

The Effect of Supplementary Shouting Technique on Muscle Activity to Rectus Abdominis and External Oblique During Crunch Exercise in Healthy Subjects

  • Kim, Chang-Yong;Kim, Hyeong-Dong
    • The Journal of Korean Physical Therapy
    • /
    • v.27 no.1
    • /
    • pp.1-6
    • /
    • 2015
  • Purpose: The purpose of this study was to examine the effects of a supplementary shouting technique on abdominal muscle activation to the rectus abdominis (RA) and external oblique (EO) muscles during performance of crunch exercise in healthy subjects. Methods: Sixty-four subjects were randomly allocated to two groups, crunch exercise with shouting group (SG) and crunch exercise with non-shouting group (NSG), with 32 subjects in each group, respectively. The interventions were conducted over three trials in each group, and measurements were performed on each subject by one examiner in three trials. Muscle activation of RA and EO was evaluated using electromyography (EMG) during performance of crunch exercise with or without shouting. Results: Our results showed a significantly greater increase in the EMG patterns of the RA and EO muscles during performance of crunch exercise in the SG compared to the NSG (p<0.01). Conclusion: These findings suggest that addition of the shouting technique during performance of crunch exercise, at the same time, would suggest positive evidence for improving activation of abdominal muscles.

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
    • /
    • v.24 no.6
    • /
    • pp.393-397
    • /
    • 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.

Wearable and Motorized Crutch Control System (착용형 전동 목발 제어시스템)

  • Yoon, Dukchan;Jang, Giho;Choi, Youngjin
    • The Journal of Korea Robotics Society
    • /
    • v.9 no.3
    • /
    • pp.133-139
    • /
    • 2014
  • This paper proposes a wearable and motorized crutch control system for the patients using the conventional crutches. The conventional crutches have a few disadvantages such as the inconvenience caused by the direct contact between the ground and the armpit of the patients, and unstable gait patterns. In order to resolve these problems, the motorized crutch is designed as a wearable type on an injured lower limb. In other words, the crutch makes the lower limb to be moved forward while supporting the body weight, protecting the lower limb with frames, and rotating a roller equipped on the bottom of the frames. Also the crutch is controlled using the electromyography and two force sensing resistor (FSR) sensors. The electromyography is used to extract the walking intention from the patient and the FSR sensors to classify the stance and swing phases while walking. As a result, the developed crutch makes the patients walk enabling both hands to be free, as if normal people do.

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
    • /
    • v.29 no.4
    • /
    • pp.445-453
    • /
    • 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
    • /
    • v.7 no.2
    • /
    • pp.124-126
    • /
    • 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.

  • PDF

A Study on Improvement of MUAP Resolution using Spatial Filter (공간필터에 의한 운동단위 활동전위의 분해능 향상에 관한 연구)

  • Yang, Duck-Jin;Jun, Chang-Ik;Lee, Young-Suk;Lee, Jin;Kim, Sung-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers D
    • /
    • v.53 no.1
    • /
    • pp.55-64
    • /
    • 2004
  • Conventional bipolar surface electromyography(EMG) technique detects only the superimposed electromyographic activity of a large number of motor units due to its low spatial resolution. For the diagnosis of neuromuscular disorder, the information of single MU is required. In this paper, 9 channel array surface electrode system was as designed and MLoG filter was proposed. Also the MCPT(modified convolution processing technique)method was proposed for the improvement of MUAP resolution. For performance evaluation, power spectrum analysis of random data and raw EMG signal comparison of MUAP shape and quantitative estimation of SNR were executed. As a result, the MUAP resolution improvement of 32% was obtained from the standpoint of the signal-to-noise ratio(SNR).