• Journal of the Korean Society of Physical Medicine
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• v.9 no.3
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• pp.315-324
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• 2014

PURPOSE: This study aimed to determine the correlation of weight bearing ability at the affected side with balance and gait abilities for the development of pressure biofeedback based equipment to stroke patients. METHODS: This study included 35 patients with stroke patient. The tests were conducted to determine the weight bearing ratio while pushing a step forward the affected side, static balance ability using the total length of COP(Center of pressure), sway velocity of COP, COP velocity at the X and Y axis. Functional reaching test (FRT), berg balance scale (BBS) were used to assess the dynamic balance ability and timed up and go test (TUG), 10m walk test (10mWT) were used assess the gait ability respectively. In order to determine the correlation between measured variables, bivariate correlation analysis was conducted. RESULTS: A significant correlation of the weight bearing ratio were shown with COP total length and velocity(r=-.34), Y-axis velocity(r=-.39), FRT(r=.42), BBS(r=.54), TUG (r=-.39), and 10m walking test (r=-.42). CONCLUSION: This study result showed that as patients with stroke had more weight bearing ratio at the affected side, not only their static and dynamic balance abilities increased more but also functional gait ability improved more. These results mean that, to improve stroke patients' static, dynamic balance ability and gait ability, weight bearing training with the affected side foot placed one step forward necessary for gaits are important.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.15 no.1
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• pp.72-78
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• 2009

Purpose: to recognized that influence of decrease low back pain, change pelvic structure and balance control on unilateral weight bearing after application on pelvic manipulation which low back pain patient in unilateral weight bearing due to pelvic imbalance. Methods: The patient with low back pain in unilateral weight bearing due to pelvic imbalance was 39year female. one subject received intervention of pelvic manipulation on sidelying position and reaching exercise on sitting position which during 2 weak at the 3 time per a weak, each 30 minutes. outcomes measured were Facia l Action Coding System(FACS), Radiograph(Lumbar-Spine Anteroposterior AP.), Pressure Scan. Results: The results of this study were summarized below : 1. FACS score were Pre: min.4 - max.6 and Post: min.2 - max.4. 2. Radiograph measured Ilium width were Pre: Lt.14cm, Rt.12.7cm and Post: Lt.13.4cm, Rt.13cm which discrepancy of Ilium height were Pre: 1cm and Post: 0.2cm. 3. Pressure scan measured Pre: Lt. 36.8%, Rt.40.2% and Post: Lt.41.3%, Rt.36.2%. Conclusion: Pelvic manipulation applied a patient with low back pain in unilateral weight bearing due to pelvic imbalance suggest that can decrease low back pain, change pelvic structure and balance control on unilateral weight bearing.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.1
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• pp.257-264
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• 2013

The purpose of this study was to examine the weight bearing exercise effect on bone mineral density(BMD) and upper extremity function in the female stroke patients. The subject were 24 female stroke patients, randomly assigned to a weight-bearing group(n=12, WBG) and a control group(n=12, CG). The experiments were conducted for three times per week for eight weeks, radial BMD and MFT(Manual Function Test) of both groups were measured before the experiments and eight weeks after the beginning of the experiments. In conclusion, it was found that there was a significant increase of the weight-bearing group radial BMD and MFT score, The results suggest that weight bearing exercise is effective in improving BMD and upper extremity function, thus, can be utilized in stroke rehabilitation.

• Journal of Korean Physical Therapy Science
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• v.2 no.3
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• pp.609-622
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• 1995

The purpose of this study was l)to compare a pelvic tilt angle between sound side and affected side in hemiplegic patients, 2)to determine the difference of weight bearing and weight shifting between sound and affected lower extremity according to the pelvic tilt angle. The subject for the study were 40 hemiplegic patients(mean age of 55.6 years)without orthopedic disability on pelvic bone. The data were analyzed by t-test, one way ANOVA, Multiple comparison and Range. The results of this study were as follows : 1. There was a significant difference in the pelvic tilt angle between sound side and affected side in hemiplegic patients(p<0.05). 2. There was a significant difference in the weight bearing value between sound and affected side in hemiplegic patients according to the posterior pelvic tilt angle(F = 12.43, df = 3/36, p<0.001). Therefore, the lesser the posterior pelvic tilt angle, the higher the weight bearing value on the affected side. 3. The lesser the posterior pelvic tilt angle, the higher the weight shifting value on the affected side. 4. There was a significant difference in weight bearing value between sound and affected side according to the grade spasticity(F = 3.61, df = 4/35, p<0.05). Therefore, the higher the grade spasticity, the lower the weight bearing value on affected side.

• Journal of Korean Physical Therapy Science
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• v.9 no.1
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• pp.53-59
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• 2002

This study is research for effect of the involved lower limb weight bearing training on symmetrical weight supporting rate improvement by practicing involved lower limb weight bearing training of three weeks period to improve standing equilibrium problem with asymmetric weight supporting rate of hemiplegia. In result of the study, it has shown that P-value incase of involved supporting rate is lower than level of significance $\alpha$<.05 and mean improvement rate of experienced group is higher in comparison with controlled group and experienced group. In changing quantity of involved maximum supporting rate, P-value is .26 and higher than level of significance $\alpha$<.05, and so it did not show significant difference statistically. But in case of experienced group between pre and post-test, involved side supporting rate and involved side maximum supporting rate showed significant improvement in all. In comparison of relative characteristic training effect difference, it was shown that train-learning effect on case of 40-60 years old, hemorrhagic patient and standard body bun of patient is valuable, which showed significant improvement in case of paralytic side and disease period, it did not show significant difference on excercise learning effect in two above cases. In the above result, we can say that continuous weight bearing training on the involved lower limb for three weeks period help improve the involved side supporting rate of hemiplegia. Accordingly, the weight bearing training on the involved lower limb is training method that patient can easily train with simple guidance of therapists, without being special expensive equipment. Furthermore it can be helpful to establish home therapeutic plan for hemiplegia through education of a patron.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.312-317
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• 1997

This paper present an optimum design for the rotor-bearing system of a high-speed (80000RPM) ultra-centrifuge supported by ball bearings with nonlinear stiffness characteristics. To obtain the nonlinear bearing stiffnesses, a ball bearing is modelled in five degrees of freedom and is analyzed quasi-statically. The dynamic behaviors of the nonlinear rotor-bearing system are analyed by using a transfer-matrix method iteratively. For optimum design, minimizing the weight of a rotor is used as a cost function and the Augmented Lagrange Multiplier (ALM) method is employed. The result shows that the rotor-bearing system is optimized to obtain 8% weight reduction.

• Journal of KSNVE
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• v.10 no.1
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• pp.97-106
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• 2000

The dynamic behavior of crankshaft-bearing system in scroll compressor has been investigated using the combined methodologies of finite elements and transfer matrices. The finite element formulation is proposed including the field element for a shaft section and the point element at balancer weight locations, bearing locations, etc., whereas the conventional method is used with the elements. The Houbolt method is used to consider the time march for the integration of the system equations. The linear stiffness and damping coefficients are calculated for a finite cylindrical fluid-film bearing by solving the Reynolds equation, using finite difference method. The orbital response of crankshaft supported on the linear bearing model is obtained, considering balancer weights of motor rotor. And, the steady state displacement of crankshaft are compared with a variation in balancer weight. The loci of crankshaft at bearing locations are composed of the synchronous whirl component and the non-synchronous whirl component.

• Physical Therapy Korea
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• v.3 no.2
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• pp.42-48
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• 1996

Weight bearing training on the involved leg is impotant for ambulation and activities of daily living in ambulatory hemiplegic patients. Traditionally, physical therapists have relied on exercise therapy and subjective evaluation. The goal for this study was to measure lower extremity weight distribution in standing with ten hemiplegic pations(M:8, F:2) and to determine the traing effect on symmetrical standing posture using a "Limloader". The Limloader is a machine designed for training symmetrical weight bearing posture. The results showed that the ability to keep the center of gravity within the limits for balance was improved significantly but the ability to adjust weight bearing on the involved leg was not (p<0.05). This study demostrated that hemiplegics can improved their symmetrical weight bearing ability using sensory biofeedback.

• Korean Journal of Applied Biomechanics
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• v.17 no.4
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• pp.89-98
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• 2007

The purpose of this study was to evaluate the trunk motion and knee joint moment during deep stand to sit and sit to stand according to the trunk weight increase. These experimental subjects were 9 males, who had no skeletal muscular disease. They were performed a SATS(stand to sit), STS(sit to stand) according to the trunk weight increase. Trunk weight increase were classified into 4 bearing trunk weight of 0%, 8%, 16%, 24% of the subject' weight. 1-way(4) RM ANOVA is applied to get the difference of trunk displacement movements and knee joint moments according to he trunk weight increase. significant level of each experiment is set as $\alpha$=.05. 1. Significant difference was classified into 3 bearing trunk weight of 0%, 16%, 24% in maximum forward backward displacement of trunk COM(center of mass). Significant difference was classified into 4 bearing trunk weight of 0%, 8%, 16%, 24% in maximum upward downward displacement of trunk COM during the SATS, STS. 2. Significant difference was classified into 4 bearing trunk weight of 0%, 8%, 16%, 24% in maximum extension knee joint moment. Significant difference was classified into 2 bearing trunk weight of 0%, 16% in maximum internal rotation knee joint moment during the SATS, STS. Therefore we expect that biomechanical model of this study will used to study for mechanical characteristics of obese people.

• The Journal of Korean Physical Therapy
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• v.35 no.2
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• pp.48-52
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• 2023

Purpose: This study was undertaken to determine whether the position of cane use affects the distribution of weight-bearing on both feet of children with hemiplegic cerebral palsy in a standing posture. Methods: Twenty participants with cerebral palsy were recruited as volunteers for this study. Using the Zebris FDM-System, weight-bearing distribution according to the method of using a cane was measured under three conditions in randomized order: (1) standing unaided (no cane); (2) standing with the affected side using the cane; and (3) standing with the non-affected side using the cane. The cane was matched by measuring length-from-floor to the greater trochanter of the subject, and was placed 15 cm outward from the little toe on the supporting side. Results: Evaluating the method of using a cane under the three conditions, we determined that pressure of the foot on the affected side was higher in the order: standing with affected side using cane > standing unaided (no cane) > standing with non-affected side using cane (p<0.05). In the post-hoc analysis, a significant difference was observed between (i) standing unaided (no cane) and standing with the affected side using cane, and (ii) standing with affected side using cane and standing with non-affected side using cane (p<0.05). Conclusion: This study suggests that induced weight-bearing methods using a cane on the affected side could increase the weight-bearing capacity on the affected side in children with spastic hemiplegic cerebral palsy, which will have a positive effect on reducing asymmetry weight support.