• Title/Summary/Keyword: Motor recovery

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The Study of the Changes of Mirror Movements with Upper Extremity on Stroke Patients (뇌졸중 환자에서 상지의 경상 운동의 변화 연구)

  • Chang, Jong-Sung;Lee, Mi-Young;Kim, Chung-Sun
    • Journal of the Korean Society of Physical Medicine
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    • v.3 no.4
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    • pp.269-276
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    • 2008
  • Purpose : The purpose of this study was to evaluate the effects of mirror movements(MM) on upper extremity's function and measure the change of MM on stroke patients depending on the elapse of time. Methods : Sixteen stroke patients with MM and Sixteen stroke patients without MM were recruited for this study. Intended movements and MM were measured by two dynanometers of MP150 system(BIOPAC System Inc., Santa Barbara, U.S.A). The upper extremity's motor function was measured using manual function test(MFT), Fugl-Meyer assesment(FMA). Results : The change rates of upper extremity's motor function test showed significant group differences in FMA but not in MFT between the patients with MM and without MM from the first test to the second test. In each group motor function generally more increased. The magnitudes of MM decreased from the first test to the second test. Conclusion : These results indicate that stroke patients with MM have a significant motor deficit. But motor deficit could be recovered by spontaneous recovery or treatments and a clinical sign of MM was improved. In the future, we suggest that studies of assessments of MM after rehabilitation and treatment interventions of MM on stroke patients.

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Correlation among Motor Function and Gait Velocity, and Explanatory Variable of Gait Velocity in Chronic Stroke Survivors

  • Lee, Dong Geon;Lee, Gyu Chang
    • Physical Therapy Rehabilitation Science
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    • v.11 no.2
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    • pp.181-188
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    • 2022
  • Objective: The purpose of this study to investigate the correlations among the motor function, balance, and gait velocity and the strength that could explain the variation of gait velocity of chronic stroke survivors. Design: This was a cross-sectional cohort study. Methods: Thirty hemiplegic stroke survivors hospitalized in an inpatient rehabilitation center were participated. The muscle tone of ankle plantarflexor and muscle strength of ankle dorsiflexor were measured respectively with modified Ashworth scale (MAS) and hand-held dynamometer. And the motor recovery and function with Fugl-Meyer assessment (FMA), balance with Berg balance scale (BBS) and timed up and go (TUG) test were measured. Gait velocity was measured with GAITRite. The correlation among motor function, muscle tone, muscle strength, balance, and gait were analyzed. In addition, the strength of the relationship between the response (gait velocity) and the explanatory variables was analyzed. Results: The gait velocity had positive correlations with FMA, muscle strength, and BBS, and negative correlation with MAS and TUG. Regression analysis showed that TUG (𝛽=-0.829) was a major explanatory variable for gait velocity. Conclusions: Our results suggest that gait velocity had correlations with muscle strength, MAS, FMA, BBS, and TUG. The tests and measurements affecting the variation of gait velocity the greatest were TUG, followed by FMA, BBS, muscle strength, and MAS. This study shows that TUG would be a possible assessment tool to determine the variation of gait velocity in stroke rehabilitation.

Sensorless Control of Non-salient Permanent Magnet Synchronous Motor Drives using Rotor Position Tracking PI Controller

  • Lee Jong-Kun;Seok Jul-Ki
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.2
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    • pp.189-195
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    • 2005
  • This paper presents a new velocity estimation strategy for a non-salient permanent magnet synchronous motor drive without high frequency signal injection or special PWM pattern. This approach is based on the d-axis current regulator output voltage of the drive system, which contains the rotor position error information. The rotor velocity can be estimated through a rotor position tracking PI controller that controls the position error at zero. For zero and low speed operation, the PI gain of the rotor position tracking controller has a variable structure according to the estimated rotor velocity. Then, at zero speed, the rotor position and velocity have sluggish dynamics because the varying gains are very low in this region. In order to boost the bandwidth of the PI controller during zero speed, the loop recovery technique is applied to the control system. The PI tuning formulas are also derived by analyzing this control system by frequency domain specifications such as phase margin and bandwidth assignment.

A Study on the Circuit Composition and Characteristics Analysis for Heavy-Duty Vehicular Hybrid Hydraulic Driving System (대형 자동차 하이브리드 유압 구동시스템의 회로구성과 특성해석에 관한 연구)

  • 이재구;이재천;한문식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.2
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    • pp.197-204
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    • 2004
  • An accumulator in hydraulic systems stores kinetic energy during braking action, and then that controls hasty surge pressure. An energy recovery system using accumulator seems to be advantageous for ERBS due to its high energy density. This study suggests a method to decide suitable accumulator volume for ERBS. The method is based upon energy conservation between kinetic energy of moving inertia and elastic energy of accumulator. The energy conversion was analyzed and a simple formula was derived. Also accumulator tests were conducted for different load mass and motor speed. A series of test work were carried out in the laboratory and the dynamic characteristics of the hydraulic motor system, such as the surge pressure and response time, were investigated in both brake action and acceleration action and these results show that the proposed design is effective for decision accumulator volume in ERBS.

Speed Control of an Overcentered Variable-Displacement Hydraulic Motor on a Constant Pressure Network (일정 압력원에 연결된 가변유압모터의 속도제어)

  • 김철수;이정오
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.272-276
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    • 1996
  • This study deals with the speed control of an overcentered variable-displacement hydraulic motor on a constant pressure network, which is noted for its high system efficiency fast dynamic response and energy recovery capability. The speed control characteristics of the conventional cascade PI controller are largely affected by load-torque disturbances. To obtain robust speed control despite torque disturbances, the load torque is estimated by an observer based on a mathematical model and compensated for by a feedforward loop. It is shown by experiment that robust speed control may be obtained with the proposed controller. The experimental data agree fairly well with the theoretical analysis.

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Transcallosal Ipsilateral Motor Pathway from the Unaffected Hemisphere in a Patient with Traumatic Brain Injury

  • Jang, Woo-Hyuk;Lee, Mi-Young;Kwon, Yong-Hyun;Jang, Sung-Ho
    • The Journal of Korean Physical Therapy
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    • v.26 no.3
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    • pp.216-219
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    • 2014
  • Purpose: We presented with a patient with traumatic brain injury who showed a transcallosal ipsilateral motor pathway from unaffected motor cortex to affected extremities, as evaluated by diffusion tensor tractography (DTT). Methods: One patient and six age-matched normal subjects were enrolled. A 42-year-old left hemiparetic male who suffered from brain injury by motor vehicle accident 9 years ago showed a leukomalactic lesion in the right corona radiata and parieto-temporal lobe. His left extremities were completely paralyzed initially, but recovered slowly over 2 years. At the time of the evaluation, he was able to grasp and release an object, and to walk with spastic gait pattern. DTT was performed using 1.5 T with a Synergy-L Sensitivity Encoding head coil. DTT was obtained with termination criteria of FA <0.2 and an angle change > $45^{\circ}c$. Results: The motor tracts of the unaffected (left) hemisphere of the patient and control subjects originated from the motor cortex and descended along the known corticospinal tract without any transcallosal tract. By contrast, the tract of the affected (right) hemisphere originated from the left premotor cortex, descended through the left corona radiata, and then crossed the mid-portion of the corpus callosum. The tract then descended through the known corticospinal tract pathway to the right medulla. Conclusion: We conclude that the transcallosal ipsilateral motor pathway from the unaffected hemisphere appeared to contribute to the motor recovery in this patient.

Case Report: The Effects of Electromyogram-Triggered Neuromuscular Stimulation In the Treatment of Guillain-Barre Syndrome (Guillain-Barre syndrome 환자의 근전도 유발 신경근 전기자극을 이용한 운동회복효과 - 사례연구 -)

  • Kim, Sun-Ho
    • Therapeutic Science for Rehabilitation
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    • v.3 no.1
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    • pp.39-45
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    • 2014
  • Objective : The purpose of this study was to investigate the efficacy of electromyogram-triggered neuromuscular stimulation in the treatment to Guillain-Barre Syndrome patients of through case Study. Methods : The subject was a 66-year old woman who has Guillain-Barre Syndrome, showed wrist and hand function decrease in FMA and JTHFT investigation. She received a electromyogram-triggered neuromuscular stimulation treatment for 4weeks, 1 per day, 30 minute for each(right, left). Results : After 4 week period, wrist and hand function of FMA was observed increase and JTHFT showed improvement in some items. Conclusion : The use of electromyogram-triggered neuromuscular stimulation in the treatment of Guillain-Barre Syndrome who had peripheral neuropathy could been effective to therapy for motor recovery.

Effects of Contralateral Acupuncture on Recovery of Motor Disorders in Stroke Patients (거자법(巨刺法)위주의 침치료(鍼治療)가 뇌졸중(腦卒中) 환자(환자)의 기능 회복에 미치는 영향(影響))

  • Seo, Jung-Chul;Cheong, Byung-Shik;Yun, Hyong-Seok;Cho, Seong-Gyu;Kim, Youn-Mi;Kim, Jong-In;Lee, Yun-Ho
    • Journal of Acupuncture Research
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    • v.18 no.3
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    • pp.1-9
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    • 2001
  • Objective : In order to study the effect of contralateral acupuncture on recovery of motor disorders in stroke patients a clinical study was performed. Methods : Thirteen patients with poststroke-hemiplegia were randomized into two groups. Six patients(test group) treated with contralateral acupuncture. The other seven patients(control group) treated with ipsilateral acupuncture. The activity of daily living was measured with a modified barthel index(MBI). The therapy was performed one a day for 3 weeks. Results : In terms of improvement of activity of daily living, the test group showed statistically meningful increase after 1 week treatment. but the control group showed statistically meningful increase after 2 weeks(p<0.05). In terms of score of MBI, the groups showed no statistically meningful difference after 3 week treatment. Conclusions : These results support that contralateral acupuncture therapy has almost same effectness compared with ipsilateral acupuncture therapy in improvement of the activity of daily living of poststroke-hemiplegic patients.

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Challenges in neuro-machine interaction based active robotic rehabilitation of stroke patients

  • Song, Aiguo;Yang, Renhuan;Xu, Baoguo;Pan, Lizheng;Li, Huijun
    • Advances in robotics research
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    • v.1 no.2
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    • pp.155-169
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    • 2014
  • Study results in the last decades show that amount and quality of physical exercises, then the active participation, and now the cognitive involvement of patient in rehabilitation training are known of crux to enhance recovery outcome of motor dysfunction patients after stroke. Rehabilitation robots mainly have been developing along this direction to satisfy requirements of recovery therapy, or focusing on one or more of the above three points. Therefore, neuro-machine interaction based active rehabilitation robot has been proposed for assisting paralyzed limb performing designed tasks, which utilizes motor related EEG, UCSDI (Ultrasound Current Source Density Imaging), EMG for rehabilitation robot control and feeds back the multi-sensory interaction information such as visual, auditory, force, haptic sensation to the patient simultaneously. This neuro-controlled and perceptual rehabilitation robot will bring great benefits to post-stroke patients. In order to develop such kind of robot, some key technologies such as noninvasive precise detection of neural signal and realistic sensation feedback need to be solved. There are still some grand challenges in solving the fundamental questions to develop and optimize such kind of neuro-machine interaction based active rehabilitation robot.

The New Smart Power Modules for up to 1kW Motor Drive Application

  • Kwon, Tae-Sung;Yong, Sung-Il
    • Journal of Power Electronics
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    • v.9 no.3
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    • pp.464-471
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    • 2009
  • This paper introduces a new Motion-$SPM^{TM}$ (Smart Power Modules) module in Single In-line Package (SIP), which is a fully optimized intelligent integrated IGBT inverter module for up to 1kW low power motor drive applications. This module offers a sophisticated, integrated solution and tremendous design flexibility. It also takes advantage of pliability for the arrangement of heat-sink due to two types of lead forms. It comes to be realized by employing non-punch-through (NPT) IGBT with a fast recovery diode and highly integrated building block, which features built-in HVICs and a gate driver that offers more simplicity and compactness leading to reduced costs and high reliability of the entire system. This module also provides technical advantages such as the optimized cost effective thermal performances through IMS (Insulated Metal Substrate), the high latch immunity. This paper provides an overall description of the Motion-$SPM^{TM}$ in SIP as well as actual application issues such as electrical characteristics, thermal performance, circuit configurations and power ratings.