• Korean Journal of Applied Biomechanics
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• v.18 no.4
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• pp.49-57
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• 2008

The purpose of this study was to determine the effects of 12-week elastic resistance exercise for the elderly on the magnitude of frequency and variability of ground reaction force signals. To this aim, total 12 elderly women aged in their 70 were participated in this study and asked to do a 12-week elastic resistance exercise program. FFT(fast Fourier Transform) was used to analyze the frequency domain analysis of the ground reaction forces's signals and an accumulative PSD (power spectrum density) normalized by support phase of walking was calculated to reconstruct the certain signals. To estimate the gait stability between the before and after exercise, values of variability were determined in a coefficient of variance. The magnitude of frequency and variability analysis for media-lateral signal revealed significantly less after exercise (p<.05). In contrast, variability of this signal's frequency that have used to evaluate the local stability during walking exhibited significantly greater after exercise(p<.05). In summary, magnitude frequency and variability of media-lateral ground reaction force's signal were significantly changed after a 12-week elastic resistance exercise.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.199-208
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• 2017

Both cardiovascular diseases caused by decreased body composition and arterial compliance and falling induced by loss of muscle mass are frequent occurrences in the elderly. Therefore, elderly people are advised to perform elastic band resistance exercises to improve their body composition and arterial compliance. Thus, the purpose of this study was to examine the effects of 12 weeks of elastic band resistance training on the body composition, arterial compliance and falling index in elderly females (> 65 years). The elastic band resistance exercise program was administered 3 times per week for 60 minutes each time for 12 weeks. In addition, the exercise intensity was set to 11-14 on the Borg scale (6-20). Before and after the training period, the body composition (body weight (BW), muscle mass, % body fat, body mass index (BMI)), arterial compliance (ankle brachial index (ABI) and pulse wave velocity (PWV)) and risk of falling index were determined. (After the program?), the BW (p=.003), BMI (p=.002), PWV (p=.017) and risk of falling (p=.037) in the exercise group were significantly reduced, whereas the BW (p=.009) and BMI (p=.009) in the control group were significantly increased. In conclusion, the body weight, BMI and arterial compliance of elderly females were positively changed by the elastic band resistance training. Thus, the elastic band resistance exercise may be useful for elderly people to prevent metabolic syndrome and cardiovascular diseases and to reduce their risk of falling.

• Journal of muscle and joint health
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• v.15 no.1
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• pp.88-95
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• 2008

Purpose: This study was to evaluate and compare the effectiveness of the Resistance Exercise Program on pain, stiffness, ADL and bone mineral density in Arthritis Patients at home. Methods: Forty-two patients participated in this study and they were divided randomly into two groups (exercise and control group). Two subjects dropped during the study period. The exercise group had a structured training which was 50 minutes in duration, five times per week for a period of 16 weeks and the control group without any scheduled treatment. Data were gathered for 16 weeks (May 21, 2007- September 10, 2007) and were analyzed by using SPSS Win 12.0. Results: The pain, stiffness, ADL, balance and bone mineral density in the exercise group were improved significantly after the Resistance Exercise Program. However, a significant improvement on the above mentioned variables was not observed in the control group.

• Journal of the Korean Applied Science and Technology
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• v.37 no.6
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• pp.1465-1474
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• 2020

The purpose of this study is the effects of 12 weeks complex training using swiss ball and elastic band on senior fitness and sarcopenia index in elderly women. The subject of this study was classified into exercise group (n=13) and control group (n=14). EG were carrier exercise program with swiss-ball and elastic band by 3 times a week, 3sets, RPE 11-13, and 60 minute. Test variables of among this study, senior fitness which is muscle strength, endurance, flexibility and dynamic balance and age-related sarcopenia index were muscle strength, muscle mass and short physical performance battery (SPPB). The results of this study were not significantly improvement at muscle strength, cardiopulmonary and flexibility but dynamic balance was significantly difference. And SPPB were significantly difference. In conclusion, the complex whole body training had positive effects on dynamic balance and SPPB of the elderly women.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.7
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• pp.102-110
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• 2019

This study is for the elderly with mental and physical dysfunction, developing resistance exercise program using tube elasticity, and analysing the effects of this movement on the improvement of gait ability, balance ability and muscle strength of the elderly. After a 12-week program for 58 participants of the daycare center, dependent t-test was performed. As a result, the total participants showed average improvement in gait, balancing and hand grip strength. This means a lot in terms of improving one's ability of ADL(Activities of daily living) and reducing the risk of falling. Therefore, if the program expands and activates the target as an entire elderly, it is expected to be a preventative way to prevent healthy elderly people from moving to the frailty who need treatment and to delay the deterioration of the frailty with disabilities.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.04a
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• pp.121-127
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• 2007

Direct acting pressure relief valve applicable to propellant tank of launch vehicle is modeled in this study The flow resistance of the partially opened valve is modeled as a function of the distance of the valve stem from the resting position. The position of the valve varies transiently as a function of its mass, the spring force, sliding friction, and the pressure differential. Choking at valve throat and compressibility are considered for the analysis. This study presents systematic analysis method for pressure relief valve applicable to propellant tank of liquid rocket. The results shows transient flow resistance caused by stem motion and the importance of choking at valve throat for pressure relief valve design.

• Korean Journal of Applied Biomechanics
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• v.17 no.4
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• pp.127-139
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• 2007

The purpose of this study was to examine the pitching ability of baseball player by analysing the effect of elastic resistance exercise and pilates exercise on EMG. Five out of currently active highschool baseball player performed 5 times a week of elastic resistance exercise and pilates for 8 weeks, each for 100 minutes. They demonstrated significant increase in EMG after 8 weeks of exercise. Especially, in extensor carpi radialis brevis and flexor carpi radialis of fore arm, they demonstrated significant increase of inning figure after exercise. These results suggested that elastic resistance exercise and pilates exercise can improve pitching ability of baseball player according to inning.

• Korean Journal of Applied Biomechanics
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• v.16 no.2
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• pp.37-44
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• 2006

The purposes of this study were to analyze and compare EMG activities of the pectoralis major, biceps brachii, triceps brachii, and brachioradialis muscles during biceps curls using a VRT device and an elastic tubing. Fifteen male college students were recruited as subjects and they performed 10-RM and 20-RM biceps curls. For each load and device condition, the mean and peak normalized EMG levels during different phases of a biceps curl were computed. For each load and phase, paired t-test (p.05) was used to find the significant difference between two devices. ANOVA with repeated measures was also used to find the significant difference among phases in terms of EMG values for each muscle. For each load and device condition, the peak and mean EMG levels during different phases of a biceps curl were computed The significant differences between devices were found in biceps brachii for EA, MD, LD phases, and triceps brachii muscles for all phases, respectively. However, no differences were found among phases for any muscle. This indicated that elastic band could have a similar characteristics of VRT. High antagonistic muscle activity as a function of injury prevention which found particularly in VRT device may suggest that elastic tubing can be a safer training device than VRT. This also imply that elastic tubing could be very effective as a home exercise tool for rehabilitation patients and elderly people.

• Journal of the Korea Concrete Institute
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• v.14 no.5
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• pp.689-697
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• 2002

The dynamic loads and load-point displacements of concrete three-point bend (TPB) specimens had been measured. The average crack velocities measured with strain gages were 0.16 ㎜/sec ∼ 66 m/sec. The fracture energy for crack extension was determined from the difference of the kinetic energy for the load-point velocity and the strain energy without permanent deformation from the measure external work. For all crack velocities, there were micro-cracking for 23 ㎜ crack extension, stable cracking for 61 ㎜ crack extension at the maximum strain energy, and then unstable cracking. The unstable crack extension was arrested at 80 ㎜ crack extension except the tests of 66 m/sec crack velocity. The tests less than 13 ㎜/sec crack velocity and faster than 1.9 m/sec showed static and dynamic fracture behaviors, respectively. In spite of much difference of the load and load-point displacement relations for the crack velocities, the crack velocities of dynamic tests did not affect on fracture energy rate during the stable crack extension due to the reciprocal action of kinetic force, crack extension and strain energy. During stable crack extension, the maximum fracture resistances of the dynamic tests was 147％ larger than that of the static tests.

• Journal of Biomedical Engineering Research
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• v.24 no.3
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• pp.209-215
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• 2003

The goal of this study was to investigate the relationship between kinematic and kinetic characteristics of foot joints resisting ground reaction force. Passive elastic joint moment and angular displacement were obtained from the experiment using 3 cameras and force plate. The relationship between joint angle and moment was mathematically modeled by using least square method. The ranges of motion of joints ranged from 5$^{\circ}$ to 7$^{\circ}$ except metatarsophalangeal joint. In the study, we presented simple mathematical models that could relate joint angle and plantar pressure. From this model, we can got the kinematic data of joints which is not available from conventional motion analysis. Furthermore, the model can be used not only for biomechanical model which simulates gait but also for clinical evaluation.