National Rehabilitation Research Institute

Seoul, South Korea

National Rehabilitation Research Institute

Seoul, South Korea

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Cho S.,National Rehabilitation Research Institute | Lee H.,National Rehabilitation Research Institute | Kim H.,National Rehabilitation Research Institute
International Conference on Control, Automation and Systems | Year: 2016

Stroke patients have reduced kinematic characteristics in gait speed, cadence, step kinematics, and range of motion (ROM). Especially, a drop foot is a common symptom during gait after stroke due to the weakness of ankle dorsiflexor. A few robotic ankle systems have been developed to measure and train pathological ankle movements. However, the previously developed systems use orthogonal ankle axis system which reproduces unnatural human ankle movements. So we have developed a robotic device that considers anatomical ankle axes in order to train ankle muscles and to measure the quantities of ankle ROM, and forefoot and hindfoot ground reaction force. We recruited 10 healthy elderly with no history of neurological disorders. Subjects performed a total of three trials with eight repetitions or more of ankle dorsi-plantarflexion using AMT. To investigate the validity of ankle angle measurements in developed AMT, we compared AMT outputs with output ankle kinematics from VICON motion capturing system. We found similar ankle movement pattern between AMT and VICON during active ankle dorsi-plantarflexion movement. The kinematics measured from AMT ankle ROM had a significant correlation with VICON ankle ROM (r =.958, n = 10, p =.00001). Therefore, we confirmed that the validity of ankle angle measurement in developed AMT. © 2016 Institute of Control, Robotics and Systems - ICROS.

PubMed | National Rehabilitation Research Institute and National Rehabilitation Center
Type: Journal Article | Journal: Annals of rehabilitation medicine | Year: 2017

To investigate the relationship between cognitive perceptual abilities of elderly drivers based on the Cognitive Perceptual Assessment for Driving (CPAD) test and their accident and penalty histories.A total of 168 elderly drivers (aged 65 years) participated in the study. Participant data included CPAD scores and incidents of traffic accidents and penalties, attained from the Korea Road Traffic Authority and Korea National Police Agency, respectively.Drivers mean age was 70.254.1 years and the mean CPAD score was 52.754.72. Elderly drivers age was negatively related to the CPAD score (p<0.001). The accident history group had marginally lower CPAD scores, as compared to the non-accident group (p=0.051). However, incidence rates for traffic fines did not differ significantly between the two groups. Additionally, the group that passed the CPAD test had experienced fewer traffic accidents (3.6%), as compared to the group that failed (10.6%). The older age group (12.0%) had also experienced more traffic accidents, as compared to the younger group (2.4%).Overall, elderly drivers who experienced driving accidents had lower CPAD scores than those who did not, without statistical significance. Thus, driving-related cognitive abilities of elderly drivers with insufficient cognitive ability need to be further evaluated to prevent traffic accidents.

Cho K.,National Rehabilitation Research Institute | Yu J.,Sun Moon University
Journal of Nanoelectronics and Optoelectronics | Year: 2016

This study investigates the changes in the brain wave of stroke patients through neurofeedback training (NFBT) using display. Thirty stroke patients were assigned to two group: 14 patients in the NFBT group, and 16 in the control group. NFBT group played the display game by watching the monitor with the poles attached, and his awakening level was controlled. The training time for this trial was set at 30 minutes, during which a 3-minute training module was conducted 10 times, and trained as five times a week for 6 weeks. Their brain waves were measured pre- and post-training through electroencephalography. In result, the frontal and parietal lobes in particular of NFBT group showed significant differences in activation after the test (p< 0.05). But there were no significant differences between before and after intervention in control group. This study suggests that rehabilitation by NFBT is effective in changing relative beta waves and improving cognitive function. Copyright © 2016 by American Scientific Publishers All rights reserved.

Hwang J.H.,Sungkyunkwan University | Lee C.-H.,Pusan National University | Chang H.J.,Samsung | Park D.-S.,National Rehabilitation Research Institute
Annals of Rehabilitation Medicine | Year: 2013

Objective: To investigate the postural control factors influencing the automatic (reflex-controlled) and attentional (high cortical) factors on dual task. Methods: We used a dual task model to examine the attentional factors affecting the control of posture, subjecting test subjects to vibration stimulation, one-leg standing and verbal or nonverbal task trials. Twenty-three young, healthy participants were asked to stand on force plates and their centers of pressure were measured during dual task trials. We acquired 15 seconds of data for each volunteer during six dual task trials involving varying task combinations. Results: We observed significantly different sway patterns between the early and late phases of dual task trials, which probably reflect the attentional demands. Vibration stimulation perturbed sway more during the early than the late phases; with or without vibration stimulation, the addition of secondary tasks decreased sway in all phases, and greater decreases in sway were observed in the late phases, when subjects were assigned nonverbal tasks. Less sway was observed during the nonverbal task in a sequential study. Conculsions: The attentional and automatic factors were analyzed during a sequential study. By controlling the postural control factors, optimal parameters and training methods might be used in clinical applications. © 2013 by Korean Academy of Rehabilitation Medicine.

Kim M.,Sahmyook University | Cho K.,National Rehabilitation Research Institute | Lee W.,Sahmyook University
Tohoku Journal of Experimental Medicine | Year: 2014

Stroke patients live with balance and walking dysfunction. Walking is the most important factor for independent community activities. The purpose of this study was to investigate the effect of a community walking training program (CWTP) within the real environment on walking function and social participation in chronic stroke patients. Twenty-two stroke patients (13 male, 50.45 years old, post stroke duration 231.64 days) were randomly assigned to either the CWTP group or the control group. All subjects participated in the same standard rehabilitation program consisting of physical and occupational therapy for 60 min per day, fve times a week, for four weeks. In addition, the CWTP group participated in CWTP for 30 min per day, five times a week, for four weeks. Walking function was assessed using the 10-m walk test (measurement for 10-meter walking speed), 6-min walk assessment (measurement of gait length for 6-minutes), and community gait assessment. Social participation was assessed using a social participation domain of stroke impact scale. In walking function, greater improvement was observed in the CWTP group compared with the control group (P < 0.05). In addition, social participation improved more in the CWTP group compared with the control group (P < 0.05). These fndings demonstrate the effcacy of CWTP on walking function and social participation in chronic stroke patients. Therefore, we suggest that CWTP within the real environment may be an effective method for improving walking function and social participation of chronic stroke patients when added to standard rehabilitation. © 2014 Tohoku University Medical Press.

Jung D.-W.,National Rehabilitation Research Institute | Park D.-S.,National Rehabilitation Research Institute | Lee B.-S.,National Rehabilitation Hospital | Kim M.,National Rehabilitation Hospital
Annals of Rehabilitation Medicine | Year: 2012

Objective: To examine the cardiorespiratory responses of patients with spinal cord injury (SCI) paraplegia using a motor driven rowing machine. Method: Ten SCI patients with paraplegia [A (n=6), B (n=1), and C (n=3) by the American Spinal Injury Association impairment scale] were selected. Two rowing techniques were used. The first used a fixed seat with rowing achieved using only upper extremity movement (fixed rowing). The second used an automatically moving seat, facilitating active upper extremity movement and passive lower extremity movement via the motorized seat (motor rowing). Each patient performed two randomly assigned rowing exercise stress tests 1-3 days apart. The work rate (WR), time, respiratory exchange ratio (R), oxygen consumption (VO 2), heart rate (HR), metabolic equivalents (METs), and rating of perceived exertion (RPE) were recorded. Results: WR, time, VO 2, and METs were significantly higher after the motor rowing test than after fixed motor rowing test (p<0.05). HR after motor rowing was significantly lower than fixed rowing (p<0.05). Conclusion: Cardiorespiratory responses as VO 2, HR and METs can be elicited by the motor rowing for people with paraplegic SCI. © 2012 by Korean Academy of Rehabilitation Medicine.

Lee J.,National Rehabilitation Research Institute | Kim K.,National Rehabilitation Research Institute | Kim J.,National Rehabilitation Research Institute | Song W.-K.,National Rehabilitation Research Institute
2012 9th International Conference on Ubiquitous Robots and Ambient Intelligence, URAI 2012 | Year: 2012

Innovative assistive rehabilitation robots are being developed with the participation of user candidates and clinical experts during the entire robot-development process. The purpose of this study is to obtain feedback from users and clinical experts during a demonstration of the first prototype of both the smart mobile walker and the upper extremity assistive robot. In the case of the smart mobile walker, safety is crucial for all users. The system's weight is another important factor for users who are elderly or fragile. In addition, people with spinal cord injuries require ease of accessibility between a wheelchair and the smart mobile walker. For the upper extremity assistive robot with spinal cord injuries require assistance to use their fine motor skills, i.e., finger movements. Different fine motor skills are assisted depending on the disability of the user. Overall, the walker needs to have the capability of being customizable while retaining its safety. In addition, the upper extremity assistive robot requires a suitable handle, a pleasant appearance, and a grasping function. This feedback will contribute to the development of a pragmatic rehabilitation robot. Copyright © 2012 IEEE.

Kim K.,National Rehabilitation Research Institute | Hong K.-J.,Chonbuk National University | Kim N.-G.,Sixty Puls Co. | Kwon T.-K.,Chonbuk National University
Journal of Mechanical Science and Technology | Year: 2011

An elbow orthosis with pneumatic artificial muscles has been developed to assist and enhance upper limbs movements and has been examined for effectiveness. The effectiveness of the elbow orthosis was examined by comparing muscular activities during alternate dumbbell curl motion wearing and without wearing the orthosis. The subjects participating in the experiment were young adults in their twenties. The subjects were instructed to perform a dumbbell curl motion in a sitting position with and without wearing an orthosis in turn, and a dynamometer was used to measure elbow joint torque in isokinetic mode. The measurements were done with four various dumbbell loads: 0, 1, 3, and 5 kg. We examined the effectiveness of the elbow orthosis in two control methods. First, the orthosis was pneumatically actuated and controlled in the passive control mode. Then, it was controlled in the active control mode using the muscular stiffness force of the muscle that is measured from a force sensor through a cDAQ-9172 board. For the analysis of muscular power, the muscular activities of the subject were measured during alternate dumbbell curl motion using MP150 (BIOPAC Systems, Inc.). The muscles of interest were biceps brachii muscle, triceps brachii muscle, brachioradialis muscle, and flexor carpi ulnaris muscle in the upper limbs of the right side. The elbow joint torque was measured during elbow flexion motion using a dynamometer at 60° per second for isokinetic strength. The experimental result showed that the muscular activities wearing the elbow orthosis were reduced and elbow joint torque wearing the elbow orthosis was higher because of the assist of the orthosis. As a result of this experiment, the effectiveness of the developed elbow orthosis was confirmed and the level of assistance was quantified. With this, we confirmed the effectiveness of the developed elbow orthosis. © 2011 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

Han K.,National Rehabilitation Research Institute | Shin J.,Yonsei University | Yoon S.Y.,Yonsei University | Jang D.-P.,Hanyang University | Kim J.-J.,Yonsei University
Computers in Biology and Medicine | Year: 2014

Virtual reality has been used to measure abnormal social characteristics, particularly in one-to-one situations. In real life, however, conversations with multiple companions are common and more complicated than two-party conversations. In this study, we explored the features of social behaviors in patients with schizophrenia during virtual multiparty conversations. Twenty-three patients with schizophrenia and 22 healthy controls performed the virtual three-party conversation task, which included leading and aiding avatars, positive- and negative-emotion-laden situations, and listening and speaking phases. Patients showed a significant negative correlation in the listening phase between the amount of gaze on the between-avatar space and reasoning ability, and demonstrated increased gaze on the between-avatar space in the speaking phase that was uncorrelated with attentional ability. These results suggest that patients with schizophrenia have active avoidance of eye contact during three-party conversations. Virtual reality may provide a useful way to measure abnormal social characteristics during multiparty conversations in schizophrenia. © 2014 Published by Elsevier Ltd.

PubMed | National Rehabilitation Research Institute
Type: Journal Article | Journal: Journal of physical therapy science | Year: 2016

[Purpose] The effects of various rhythmic auditory stimulation tempos on stroke gait pattern changes when training patients with a smartphone-based rhythmic auditory stimulation application were investigated. [Subjects and Methods] Fifteen patients with chronic stroke were included. Cadence during comfortable walking was measured (baseline). After the baseline findings were recorded, rhythmic auditory stimulation with five different tempos (i.e., -10%, -5%, 0%, +5%, and +10% change from baseline) was randomly applied. Finally, comfortable walking without rhythmic auditory stimulation was initiated to evaluate gait pattern changes. [Results] As the tempo increased, the spatiotemporal gait parameters of the stroke patients changed significantly. Gait speed, cadence, and gait cycle duration showed the greatest improvement in the +10% rhythmic auditory stimulation condition compared to baseline. After gait training with rhythmic auditory stimulation, gait speed, cadence, stride length, gait cycle duration, and step length of the affected and unaffected sides improved significantly compared to baseline. [Conclusion] Significant changes in the gait pattern of stroke patients were noted for various tempos after training with rhythmic auditory stimulation. These findings could be used to customize rehabilitative gait training for patients who experience stroke with hemiplegia.

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