• 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.

• 한국체육학회지인문사회과학편
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• v.54 no.5
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• pp.769-780
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• 2015

This study investigated the changes in inflammatory mediators, immunocompetent cells and bone merrow progenitor cells by the magnitude of muscle damage and type of the muscle contraction in the elderly. Twenty older adults who had not been involved in a resistance-training program at least 6 months prior to the present study were assigned to eccentric exercise group (ECC, n=10) and concentric exercise group (CON, n=10). All subjects performed 10 sets of 6 maximal isokinetic eccentric (ECC 1) or concentric (CON) contractions with the non-dominant arm in a randomized, with 4 wk between bouts (ECC 2). Skeletal muscle damage index (ROM, VAS, Plasma CK), inflammation mediators (TNF-α, IL-1, IL-6), immunocomperent cells (CD3+, CD4+, CD8+, CD19+), bone merrow progenitor cell (CD34+) and leukocytes were measured before, immediately after, 2, 24, 48, 72, and 96 h after exercise. Changes in ROM and VAS were greater (P<.05) after ECC 1 than CON and ECC 2. Increases in TNF-α and IL-6 were greater (P<.05) 24, 48 and 72 h after ECC 1 than CON and ECC 2. Increases in neutrophils were greater (P<.05) 2 h after ECC 1 than CON and ECC 2. It was confirmed that muscle damage was greater following eccentric than concentric contractions as well as first bout than second bout in the elderly, and suggested that TNF-α, IL-6 and neutrophils should closely correlate with magnitude of muscle damage.

• Journal of Korean Public Health Nursing
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• v.24 no.1
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• pp.39-48
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• 2010

Purpose: To examine the effects of a 36-week resistance training program on body composition, fitness and blood lipid profiles in the obese elderly. Method: fourteen subjects were assigned into the resistance training group. The 12-16 exercise sessions were performed for 60min with 15-25 repetitions twice per week for 36 weeks. Data were analyzed by paired t-test with SPSS version 12.0 for Windows. Results: Significant changes were evident in weight (t=5.983, p<.001), body mass index (t=5.922, p<.001), % body fat (t=3.480, p=.004), and fat free mass (t=-2.592, p=.022). Concerning exercises, no significance was noted for back scratch (t=-1.814, p=.093), but were for 2-min step (t=-3.075, p=.009), arm curl (t=-2.223, p=.045), chair stand (t=-3.671, p=.003), chair sit and reach (t=-2.508, p=.026), and 8-ft up and go (t=5.545, p<.001). No significant changes were evident in total cholesterol (t=1.189, p=.279), and total glucose (t=0.689, p=.517), while the change in high-density lipoprotein was significant (t=3.535, p=.012). Conclusion: The 36-week resistance training program enhanced body composition and physical fitness, but not blood lipid profiles in obese elderly subjects.

• The Journal of Korean society of community based occupational therapy
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• v.8 no.2
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• pp.29-37
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• 2018

Objective : Sleep disorder caused by stress or disease to elderly currently. We tried to make clear constant exercise according to exercise intensity would have effect on sleep disorder in elderly using EEG and melatonin. Methods : Thirty subjects were over 65 years old who lived a senior facility in some parts. They were able to communicate and understand the purpose of the study. They also expressed their intension to participate actively in experiment. They should have alert consciousness and orientation about time, place, and people. Sleep disorder was assessed via below 6 hr total sleep time and Pittsburge Sleep Quality Index, which was satisfied with both of criterion at the same time. Exercises composed of low intensity walking, moderate aerobic exercise, and high intensity resistance strength. We used QEEG 8-System (LAXTHA Inc. KOREA) to check wave type and Polysomnograpy (Compumedics, Australia) to test quality of sleep. and Histologic features were observed by TTC (triphenyltetrazolium chloride) staining and H & E (Hematoxylin & Eosin) staining. Results : There was a significant sleep index and change of melatonin after aerobic exercise. There was a significant SOL, S1, S2, and SWS in aerobic exercise, but there was a significant SWS in walking and resistance strength. There was a significant change of delta wave especially in frontal and temporal region between exercises. Conclusion : They had different effects according to type of exercise, when elderly who have chemical, behavioral change of circadian rhythms did exercise consistently. Aerobic exercise had more effect on sleep disorder than other exercise. Therefore, we may supply proper exercise to elderly and high quality of life.

• Journal of Obesity & Metabolic Syndrome
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• v.23 no.3
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• pp.156-161
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• 2014

Childhood obesity has more than doubled in children and adolescents in the last decade. Obese youth are more likely to have risk factors for cardiovascular disease and type 2 diabetes such as high cholesterol, high blood pressure, insulin resistance, and metabolic syndrome. There is no single or simple solution to the childhood obesity epidemic, but to learn that obesity is closely related to lifestyle factors including poor fitness and physical inactivity as well as prolonged sitting time in conjunction with westernized dietary habits. In addition to a healthy and balanced diet, promotion of physical activity combined with carefully supervised resistance exercise training, and reduced screen time is a primary recommendation for the prevention and treatment of obesity in children and adolescents. This review provides evidence based data to support this multiple-step physical activity strategy as the most effective and preventive means against childhood obesity.

• Tuberculosis and Respiratory Diseases
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• v.45 no.2
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• pp.351-359
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• 1998

Background: The effects of exercise on pulmonary function are complex and have been the subject of many investigations. But, there has been disputes about the effect of exercise on spirometric parameters and there is no study about the effect of exercise on IOS(Impulse Oscillometry)parameters. IOS, a new method of pulmonary function test, is based on the relationship between the pressure and flow oscillation which is produced by applying sinusoidal pressure oscillation to the respiratory system via the mouth. Method: Fifty-nine young adults without respiratory symptoms were divided into three groups according to degree of exercise(hard exercise group: mean exercise time is over three hours per week at least for the last one month, light exercise group : between thirty minutes to three hours, nonexercise group : less than thirty minutes) and undertaken pulmonary function test(simple spirometry and IOS). Results: The effects of exercise on spirometric parameters; percentage of predictive value of forced vital capacity(FVC % pred) was higher in hard exercise group than nonexercise group(hard exercise group: $102.4{\pm}14.8$, nonexercise group: $93.7{\pm}9.9$, p=0.017), but there was no significant difference in percentage of predicted value of forced expiratory volume in one second(FEV 1 % pred) and percentage of predicted value of forced expiratory flow 50% (FEF 50% pred) between groups. The effects of exercise on IOS parameters: Reactance at 5Hz(X5) was significantly lower in hard exercise group than nonexercise group(hard exercise group: $-0.166{\pm}0.123hPa/1/s$, nonexercise group: $-0.093{\pm}0.036hPa/1/s$, p=0.006) but there was no significant difference in central resistance(Rc), peripheral resistance(Rp), resonance frequency(RF) and resistance at 5Hz, 20Hz between groups. Conclusion: Hard exercise increased FVC % pred on spirometric parameters and decreased reactance at 5Hz(X5) on IOS parameters.

• Korea and Global Affairs
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• v.1 no.1
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• pp.7-30
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• 2017

The conspiracy theories of political events are occurring in every country and society. In Korean society, conspiracy theories about political events are constantly happening. Conspiracy refers to the phenomenon of a particular individual or group who oppose the official causes of social phenomena. Conspiracy is a resistance to the credibility of the state and the government. In Korean society, conspiracy occurs mainly in political events. The conspiracy theories of political events appear in the form of conservatism and progressivism, which seeks to replace political power and political power to stabilize political power. The conspiracy theory about Jang Jun-Ha's death occurred in the process of seeking justification for a person who is resisting the ruling forces. Also, the conspiracy theory of the Gwangju Democratization Movement and the Cheonan Warship Sinking may be a drag on the justification for the justification for the takeover of the new military government and the justification for the Disconnection of inter-Korean relations. In Korean politics, Conspiracy theory is a factor that confuses Korean society regardless of whether it is true or not.

• Journal of the Korean Applied Science and Technology
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• v.35 no.2
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• pp.519-531
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• 2018

The purpose of this study was to investigate the effects of combined exercise program on short physical performance battery, bone mineral density and parathyroid hormone levels in elderly women. This study subjects were 22 elderly female volunteers, aged 65-75 years and they divided into the combined exercise group(n=11) and the "no exercise" control group(n=11). The combined exercise included the line dance program performed twice per week for 60 minutes and the resistance exercise program performed once per week during 12 weeks. Exercise intensity was progressively increased from RPE "fairly light" to "slightly hard" (from 11 to 14). The findings of this study were as follows; Short physical performance battery(Balance test, gait speed, and rising from a chair five times) and bone mineral density (lumbar spine L2~L4 bone densities, and the T-score) were significantly increased after 12 weeks in the exercise group compared to the baseline. The PTH level was significantly decreased in the exercise group compared to the baseline. In conclusion, regular and continuous physical activity was effective for improving short physical performance and had a positive effect on bone mineral density and parathyroid hormone. With aging, women have decreased muscle strength and bone density and therefore, it is strongly recommended that women need to carry out continuous physical activity to prevent disease and ensure a healthy retirement.

• Journal of the Society of Naval Architects of Korea
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• v.30 no.3
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• pp.75-89
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• 1993

The present paper describes an application of UA(Uncertainty Analysis) to seakeeping model test, basically according to the Performance Test Code of ASME(American Society of Mechanical Engineers), in which all the possible error sources involved in the preparation of test, calibration of instruments, data acquisition and analysis are quantified, and summed up with error propagation coefficients to the final uncertainties. The differences between the static test such as resistance and propulsion test and the dynamic test like seakeeping test are clearly identified during all the procedures of UA and asymmetric bias errors are considered. The DRE(data reduction equation) subject to present UA are the heave and pitch response amplitude operator and nondimensionalized absolute frequency. The usefulness of UA in seakeeping test were confirmed not only for quantifying errors and improving measurement accuracy but also for the validation of various seakeeping analysis tools.

• Journal of Wellness
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• v.7 no.4
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• pp.187-199
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• 2012

The purpose of this review was to introduce a new training concept as pneumatic training method and how to apply the principles. Uses the new resistance, especially air powered that invisible, intangible, along with training on how to contribute to broadening their horizons, while attempts have been passed. Provide transition training methods in accordance with the trend of the times, and why these changes may be in the form of outside-free for theoretical consideration. From weight resistance, hydraulic, isokinetic exercise, and to pneumatic training why justification should apply for these training methods are presented also suggested the superiority of pneumatic training. In the near future, newly developed training method will be appear. In conclusion, it will be contribute to sports by concerning and applications to cutting edge training