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Hwang, Seonhong,Park, Jeong-Mee,Kim, Youngho De Gruyter 2016 Biomedizinische Technik. Biomedical engineering Vol.61 No.3
<P><B>Abstract</B></P><P>An 11-year-old child was able to walk independently even though he had injured his femoral nerve severely due to a penetrating wound in the medial thigh. In this study, gait analysis was conducted five times totally for 16 months to observe the characteristics of the gait parameters, which enabled him to walk independently. The cadence, walking speed, stride length, step length, stride time, step time, double limb support, and single limb support all improved after the third test (GA3). Insufficient knee flexion during the stance phase, that was the main problem of the subject, improved from 0.96° to the normal level of 17.01°. Although hip extension was also insufficient at the first test it subsequently improved and reached the normal range at the GA5. The peaks of the ground reaction force curve were low at the initial tests. However, these eventually improved and reached the reference values. The knee extensor moment during the stance phase increased markedly at the last test. Although the child lost his femoral nerve function, he was able to walk independently by compensating for the major function of the rectus femoris. In order to facilitate shock-absorption and move the feet forward, he reduced both gait speed and stride length, respectively. The results of this study are expected to provide insight into how clinicians set up their therapy goals, while considering compensations and changes over time.</P>
Joint Moments and Lumbar Lordosis during Symmetric Lifting
Seonhong Hwang,Sungjae Hwang,Youngeun Kim,Youngho Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this study, contributions of lower extremity joints and lumbar lordotic angles were investigated for two different symmetrical lifting techniques using the three-dimensional motion analysis: squat and stoop. Joint angles and moments were determined when the lumbar curvature changed from kyphosis to lordosis. Thirteen male volunteers lifted boxes weighing 5, 10 and 15㎏ by both squat and stoop lifting techniques. Results showed that extension moments of hip and ankle joints contributed the most to support the body in squat lifting, and the knee flexion moment played an important role in stoop lifting. There were individual differences in lower extremity joint moments when the lumbar lordotic curve appeared. However, the correlations about angles and moments between lumbar and lower extremity joints could confirmed the results from the support moment analysis. In conclusion, there might be some strategy to minimize mechanical stress on the waist by the change of lordotic curvature in the lumbar spine for the safe lifting technique.
An Inverse Dynamic Model of Lower Limbs for Variation of Parameters
Seonhong Hwang,Hueseok Choi,Sungjae Song 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The anthropometric data for analyzing the threedimensional motion analysis assumes the human body is symmetric with respect to the mid-sagittal plane, which results in erroneous results in inverse dynamics to calculate joint moments and powers for asymmetric models such as amputee gait. In this study, we estimated the effect of the anthropometric asymmmetry on lower extremity joint moments. The moment of inertia and the segmental length did not affect joint moments significantly. However, the added mass on either side significantly affected joint moments especially during swing phase. Therefore, the use of the symmetric model for human motion analysis should be cautious especially in asymmetric anthropometry.
Seonhong Hwang,Heewon Park,Minwoo Seon,Yuik Moon,Suhui An,Jongsang Son 호서대학교 기초과학연구소 2023 기초과학연구 논문집 Vol.31 No.1
In this study, we investigate the effects of neuromuscular electrical stimulation (NMES)-induced eccentric contraction training for two weeks on muscle strength, activation level, and muscle architecture in healthy people. Six non-disabled (4 male, 2 female) volunteered to participate. The ultrasonographic images and dorsiflexion forces were measured when subjects performed the full relaxation, maximum voluntary isometric contraction (MVIC), and NMES-induced maximum involuntary isometric contraction of their tibialis anterior muscles in both pre- and post-test. After a two-week training period, the changes in the mean maximum NMES force ratio increased from 72.5 % to 88.92 %. The changes in the TA thickness during MVIC decreased significantly from 0.22 cm to 0.11 cm. The NMES-induced eccentrical contraction training described here effectively increases muscle strength with less muscle thickness changes after two weeks of training. This training technique may have a role in neuromuscular rehabilitation.
Seonhong Hwang,Chung-Ying Tsai,Sarah R Bass,Alicia M Koontz 한국재활복지공학회 2014 한국재활복지공학회 학술대회논문집 Vol.2014 No.11
The purpose of this study was to quantify the repeatability and reliability of the upper limb joint angles from eight subjects simultaneously measured by the Kinect and Vicon during wheelchair transfer. Shoulder, elbow, wrist joint, and trunk angles were calculated. The Kinect showed excellent correlation with the Vicon on the time series angle curve (r > 0.61). The shoulder abduction-adduction angle of leading arm and trunk angles were satisfied with ICC values over 0.81. Except for the maximum and minimum angles of leading arm"s elbow joint and those of trunk angles, all other variables had larger ICC differences than 0.1 between two systems. Good correlation of the Kinect with the Vicon and good reliability and validity of the Kinect seemed to indicate a potential application of the Kinect system for practical use at home or in clinics as a low-cost virtual coaching system for upper body motion correction during transfer.
원통형 물체 쥐기 시 건강한 성인과 척수마비 환자의 최대 손가락 끝 힘 분포 비교
황지선(Jisun Hwang),이재선(Jae Sun Ree),황선홍(Seonhong Hwang) 한국전문물리치료학회 2022 한국전문물리치료학회지 Vol.29 No.1
Background: It is known that hand strength and fingertip force are used as an indicator of muscle strength and are also highly related to the various chronic symptoms and even lifes-pan. To use the individual fingertip force (IFF) as a quantitative index for clinical evaluation, the IFF should be measured and analyzed with various variables from various subjects, such as the normal range of fingertip force and the difference in its distribution by disease. Objects: We tried to measure and analyze the mean maximum IFF distribution during grasp-ing a cylindrical object in healthy adults and patients with spinal cord injury (SCI). Methods: Five Force-sensitive resistor (FSR) sensors were attached to the fingertips of 24 healthy people and 13 patients with SCI. They were asked to grip the object three times for five seconds with their maximum effort. Results: The mean maximum IFF of the healthy adult group’s thumb, index, and middle fin-ger was similar statistically and showed relatively larger than IFF of the ring and small finger. It is a 3-point pinch grip pattern. All fingertip forces of patients with SCI decreased by more than 50% to the healthy group, and their IFF of the middle finger was relatively the largest among the five fingertip forces. The cervical level injured SCI patients showed significantly decreased IFFs compared to thoracic level injured SCI patients. Conclusion: We expect that this study results would be helpful for rehabilitation diagnosis and therapy goal decision with robust further study.
가속도 주파수분석 방법을 이용한 스마트폰 기반 정적균형평가
황지선(Jisun Hwang),황선홍(Seonhong Hwang) 한국전문물리치료학회 2018 한국전문물리치료학회지 Vol.25 No.3
Background: At present time, smartphones have become very popular and powerful devices, and smartphone applications with the good validity have been designed to assess human balance ability. Objects: The purpose of this study is to evaluate the feasibility of smartphone acceleration in the assessment of postural control ability for six different conditions. Methods: Twenty healthy college-aged individuals volunteered. Static balance ability was measured twice with one-day interval using smartphone application and 3D motion capture system under the six different conditions. Results: Dominant frequencies for each test condition did not show significant differences except for two conditions. The intra-rater correlation coefficient between the first and second tests showed high correlations in six conditions(r>.70, p<.05). Smartphone acceleration and the acceleration calculated from the 3D marker position data showed high correlation coefficient(r>.80, p<.001). Conclusion: Acceleration recorded from a smartphone could be useful assessment variables for balance test in the clinical field.