• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.19 no.1
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• pp.63-68
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• 2013

Background: The purpose of this study is to examine the effects of unstable bridge exercise on the posture of female university students. Methods: The subjects of this study were 30 female university students who were equally and randomly allocated to a unstable bridge exercise group, an experimental group, and a stable bridge exercise group, a control group. Both did so for 30 minutes three times per week over a six-week period. Using BackMapper, their trunk inclination (TIN), trunk imbalance (TIM), pelvic position (PPO), pelvic torsion (PTO), pelvic rotation (PRO), and the position of their scapulae (PSA) were evaluated. Results: The unstable bridge exercise group obtained significant results in TIN, TIM, PPO, PTO and PSA, while the stable bridge exercise group obtained significant results in TIN, PPO. Conclusion: unstable bridge exercise may be applied as a method to correct the posture of average adults.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.19 no.1
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• pp.41-47
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• 2013

Background: The purpose of this study is to examine the effects of visual feedback squat exercise on the young adults with Patellofemoral pain syndrome. Methods: The subjects of this study were 22 female and 8 male who were equally and randomly allocated to a visual feedback exercise group (VSEG), an experimental group, and squat exercise group (SEG), a control group. Both did so for 30 minutes three times per week over a six-week period. Using Dartfish, their static Q-angle (SQA) and dynamic Q-angle (DQA) were evaluated. Results: The static Q-angle was significantly reduced in both groups of VSEG and SEG and in the comparison of difference values before and after exercise between groups, VSEG had more significant effect than SEG but in the comparison of the effects of dynamic Q-angle both VSEG and SEG had significant effects and in the comparison of difference values before and after exercise between groups, VSEG had more significant effect than SEG. Conclusion: Visual feedback squat exercise may be applied as a method to correct the lower extremity alignment with PFPS.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.15 no.2
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• pp.25-34
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• 2009

Purpose : The purpose of this study is to investigate that the Effects of Pain, Lumbar Flexibility and Abdominal Obesity of Patient with Low Back Pain and Abdominal Obesity after Lumbar Strengthening Exercise. Methods : The selected subjects of this study were 17 patients who had diagnosis on low back pain and body mass index was more than $25kg/m^2$ and lumbar length was more than 90cm. They divided into a control group with 10 patients doing lumbar stabilization exercise and an experimental group with 7 patients ding simple lumbar strengthening exercise in order to compare degrees of oswestry disability index and lumbar stability, lumbar length was measured before the exercise, in 4 weeks and 8 weeks after exercises respectively. Result : lumbar strengthening exercise on patients with low back pain and abdominal obesity affected improving function of lumbar and decrease of pain with abdominal obesity. Conclusion : Then lumbar stabilization exercise than simple strengthening exercise affected decrease of Visceral fat tissue on abdominal obesity.

• Journal of the Korean Society of Safety
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• v.29 no.4
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• pp.153-159
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• 2014

Low back pain is one of major issues in musculoskeletal diseases mainly caused by MMH (Manual Material Handling) tasks. In Korea, the standards of NIOSH(National Institute for Occupational Safety and Health) Lift Equations in U. S. A. have been most widely used. However, there is no standard in case the height of one feet is higher than that of another one. Moreover, since the standards are developed in U. S. A., there are many limitations for the applicability of Korean workers. In this study, MVC(Maximum Voluntary Contraction) for four postures are measured and an empirical model based on SVR(Support Vector Regression) is constructed. Constructing SVR model, PSO(Particle Swarm Optimization) is employed to investigate the optimal parameters of SVR. The results show that the performance of this empirical model is approximately accurate, even if the deviation of experimental values is large due to the individual differences. This empirical model may contribute to establish the standards of MMH tasks in Korea.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.05a
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• pp.220-223
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• 2008

Large curved plate blocks are widely used to construct hull structure in shipbuilding industry. Most curved plates are manufactured by using manual method called as line heating that use deformation caused by residual stress after local heating along a line which is perpendicular to the curvature direction. However, its working environment is poor and its formability is totally dependent on an experienced technician. In view of that, multi-point dieless forming (MDF) technology that use reconfigurable punch arrays instead of one piece die is proposed in this study. The MDF process is based on a concept of equivalent die surface made by numbers of punches which has round tip at the end of it. In this study, numerical simulation for common curvature type such as saddle shape was carried out. In addition, experiments in the plate forming process were also conducted to compare with the numerical results in view of final configuration. Consequently, it was noted that the proposed dieless forming method has considerable feasibility to substitute the new process for conventional manual method.

• Journal of Physiology & Pathology in Korean Medicine
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• v.30 no.3
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• pp.184-189
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• 2016

Human appearance analysis is an important part of both eastern and western medicine fields, such as Sasang constitutional medicine, rehabilitation medicine, dental medicine, and etc. By the rapid growing of depth camera technology, 3D measuring becomes popular in many applications including medical area. In this study, the possibility of using depth cameras in asymmetry analysis of human appearance is examined. We introduce the development of 3D measurement system using 2 Microsoft Kinect depth cameras and fully automated asymmetry analysis algorithms based on computer vision technology. We compare the proposed automated method to the manual method, which is usually used in asymmetry analysis. As a measure of repeatability, standard deviations of asymmetry indices are examined by 10 times repeated experiments. Experimental results show that the standard deviation of the automated method (1.00mm for face, 1.22mm for body) is better than that of the manual method (2.06mm for face, 3.44mm for body) for the same 3D measurement. We conclude that the automated method using depth cameras can be successfully applicable to practical asymmetry analysis and contribute to reliable human appearance analysis.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.26 no.2
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• pp.1-10
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• 2020

Background: This study aimed to investigate the effect of hold-relax and antagonist contraction (HR-AC) technique and Kinesio taping on pain changes in delayed-onset muscle soreness (DOMS) of 20's adults. Methods: Based on voluntary participation, 14 participants with induced-DOMS were randomly divided into control (non-treatment, n=7) and experiment group (HR-AC technique and kinesio taping, n=7). Measurement were used visual analogue scale (VAS), heart rate variability (HRV), and brain wave (alpha). There were 5 sets of the HR-AC technique application on the 5th day from the day of DOMS induction (rest for 30s between sets). Kinesio taping was applied to the same area after HR-AC. Results: The VAS showed significant changes according to the period and in the interaction between the period and the group (p<.01). HRV and alpha wave (Fp1) showed significant changes according to the period (p<.001). The analgesic effect was more rapid and continuous in the experimental group than in the control group. Conclusion: This study showed that the HR-AC technique and Kinesio taping are effective interventions for the management of pain and stress caused by DOMS.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.27 no.3
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• pp.69-78
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• 2021

Background: Approximately 30% of people suffer from chronic neck and shoulder pain. Chronic neck and shoulder pain arise due to the exposure to continuous low loading and monotonous work. This is a common musculoskeletal disorder in a society. As physical therapists, we should give appropriate treatment to these people. Methods: A total of 26 patients with chronic neck and shoulder myalgia were randomly allocated into two experimental groups. First, 13 patients received shoulder strength training, while the other 13 patients received cervical mobilization. Outcome measures included bilateral pressure pain threshold by using an algometer at upper trapezius, visual analogue scale (VAS) to express their pain scale, and muscle tension by using myoton pro device pre-intervention and after the final treatment. Results: The VAS and muscle tension in upper trapezius significantly decreased (p<.05) in both groups; however, no differences between two groups were observed (p>.05). The pressure pain threshold in upper trapezius significantly increased (p<.05) in both groups; yet, again, the differences between the groups did not reach statistical significance (p>.05). Conclusion: As methods of treatment, shoulder-specific strength training and cervical mobilization can be appropriate approaches to the treatment of neck and shoulder musculoskeletal disorder.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.27 no.3
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• pp.47-55
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• 2021

Background: Plantar fasciitis is one of the most common conditions of the lower limbs. The present study aimed to compare the effect of hip muscle strengthening exercise and stretching of lower extremity in plantar fasciitis, with regard to pain, navicular drop and foot and ankle functional ability. Methods: A total of 42 patients diagnosed with plantar fasciitis were randomly assigned to the experimental group (n=21) that applied the hip muscle strengthening exercise and the control group(n=21) that applied the general lower limb stretching. The intervention period was 6 weeks. Results: The results of the experiment showed that the exercises for strengthening the hip muscle had significant effects on pain, navicular drop and foot and ankle functional ability In addition, lower extremity stretching showed improvement effects in pain, navicular drop and foot and ankle functional ability, however, the difference between the groups except navicular drop did not reach statistical significance Conclusion: Both interventions tested in this study were confirmed to be effective treatment options for patients with plantar fasciitis.

• Safety and Health at Work
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• v.14 no.1
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• pp.59-65
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• 2023

Objectives: Epidemiological evidence linking long working hours and shift work to metabolic syndrome remains inadequate. We sought to evaluate the impact of reducing working hours on metabolic syndrome. Methods: We compared the prevalence of metabolic syndrome among male manual workers in a manufacturing company (N = 371) before and after the introduction of policy to reduce daily work hours from 10 to 8 hours. Components of metabolic syndrome were measured in periodic health examinations before the intervention, 6-9 months after, and 1.5-2 years after the intervention. Generalized estimating equation models were used to estimate changes in the prevalence of metabolic syndrome. Analyses were stratified by day work versus shift work. Results: The results showed a significantly decreased prevalence of metabolic syndrome 6-9 months following the intervention in day workers (risk ratio = 0.68, 95% confidence interval 0.52-0.88), but the benefit disappeared after 1.5-2 years. Shift workers showed a decreased prevalence of metabolic syndrome for the whole follow-up duration after the intervention, although the change was not statistically significant. Conclusion: Reducing working hours was associated with short-term improvement in metabolic syndrome in male manual workers.