• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.6
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• pp.2691-2697
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• 2011

The purpose of the dissertation is to offer basic data available for being conducive to application of a training program by comparatively analyzing the players' physical strength, the knee joint, a hip joint, power of the trunk joint and muscle power in order to study isokinetic strength and muscle power between short distance athletes and Taekwondo players. This study measured peak power, %Body weight peak power, always power, and %Body weight peak power targeting 8 male athletes and 8 male Taekwondo players who warmed up 10 minutes before from the test to reduce repulsion and unfamiliarity at the instrument. The power of the knee joint($60^{\circ}$/sec), muscle power($180^{\circ}$/sec), were measured by using HUNOM(U.S.A). As a result of the physical strength, statistically, short distance athletes were indicated to be better in muscle strength, muscular endurance than Taekwondo players, and there was no significant difference between flexibility, power, and muscular endurance. Although the short distance athletes were indicated to be better in right and left muscle strength of knee joint than Taekwondo player, there was no significant difference and Taekwonde players were indicated to be higher at the right and left muscle power than short distance athletes.

• Korean Journal of Applied Biomechanics
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• v.16 no.2
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• pp.85-95
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• 2006

The purpose of this study of which 10 University students in their twenties are the objects was to examine the causal differences of kinematic and electromyography during power walking and normal gait. We came to the following conclusions. 1) It took less time to stance phase, swing phase and whole gait time during power walking compared with normal gait. 2) During power walking, the step length and step length and lower limb length are longer than that of normal gait. 3) During power walking, ankle joint angle became more plantar flexed at LIC and RTO, knee joint angle become more flexed, so did hip joint angle at LIC and RTO. Besides during power walking the shoulder joint angle movement was bigger and elbow joint angle was more flexed as the trait of power walking. 4) During power walking, through out the phase the muscle activity of all muscle was higher expecially the muscle activity of Biceps brachii, gastrocnemius medialis, gastrocnemius lateralis, Soleus was higher. Therefore during power walking, one's scope of activity and muscle activity is relatively higher than those of normal gait, so power walking helps one strengthen muscular power and energy metabolism. This will be useful information for those who are interested in diet and well-being.

• Journal of Korean Physical Therapy Science
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• v.13 no.1
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• pp.29-38
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• 2006

The purpose of this study lies in finding out the effect that variation of pain and body deflection posture has an influence on the static spinal stabilization after having performed spinal stabilization exercise making degenerative disc disease patients an object over 8 weeks using $CENTAUR^{(R)}$, 3-D spinal stabilization training implement. Subjects : 61 of DDD patients were made as an object of this study (mean age: 45.46 years, SD: ${\pm}12.78$, range: 16-68), their average height was 161.87cm, average weight 60.70kg, 12 males and 49 females were involved. Methods: 8 various investigations were performed and varied values were compared with reinvestigation done after having exercised 8 weeks using 3-D $CENTAUR^{(R)}$. We used VAS(Visual Analog Scale) in order to see the variation of pain intensity, MOS(Modified Oswestry Scale) in order to see activities of daily life. Results VAS was lessened from 7.50 to 2.71, limitation of routine life(MOS) from 20.26 to 9.32, there were remarkable differences statistically(p<0.05). As a result of muscular investigation for static spinal stabilization by 8 variations of body deflection, muscular strength were all increased and there were remarkable differences statistically(p<0.05). Conclusions : It has been turned out that pain and limitation of daily life was lessened as a result of making 61 of degenerative disc disease patients exercised 8 weeks using $CENTAUR^{(R)}$, 3-D spinal stabilization training implement, deep muscular power was increased. Thus it has been turned out that 3-D lumbar stabilization exercise has an effect on the spinal muscles strengthening and alleviation of their pain for degenerative disc disease.

• The Journal of the Korea Contents Association
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• v.15 no.10
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• pp.336-345
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• 2015

This study conducted the following experiment to examine change of biophysical and physical fitness function on combined exercise program in 20' female university students with obesity according to heights of insole. Obesity related biophysical function was measured by basal metabolism and percent body fat(% Fat) and health related physical fitness was measured by isokinetic strength of quadriceps femoris muscle, muscular endurance, flexibility and power on comparative analysis of pre, post exercise and each groups(0cm, 5cm, 9cm) in 36 female university students with obesity subject according to heights of insole. These result lead us to the conclusion that each group were statistically improved at isokinetic muscular strength of quadriceps femoris muscle and basal metabolism, but 5cm group compared with 0cm and 9cm group was more significant improvement. Consequently, combination exercise applying appropriate heights of insole would be lead to positive increment of muscular strength and basal metabolism.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.17 no.1
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• pp.29-38
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• 2009

This paper surveys the historical perspective and design considerations for developing the human powered aircraft(HPA). Especially the weight and materials, aerodynamics, flight controls, and power trains are focused. The average power a human can produce and sustain is approximately 200${\sim}$250 W which is a critical design constraint of HPA. The survey shows that the empty weight of HPA was in the 30${\sim}$40 kg range(90${\sim}$110 kg include pilot). Thus, in order to design a successful HPA, the value of power to weight ratio should be 2.0 W/kg or above. The HPA design technique could be applied directly to the development of an unmanned high altitude airplanes used for atmospheric research, where light structures, low Reynolds number aerodynamics and high efficiency propeller design are required as well.

• Korean Journal of Clinical Laboratory Science
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• v.43 no.2
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• pp.43-47
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• 2011

Angiotensin converting enzyme (ACE) is a vital enzyme in the renin-angiotensin-aldosterone system, and there are literature reports describing its relationship between the ACE polymorphism and muscular strength, muscular endurance and flexibility. The purpose of this study is to identify the distribution of the ACE gene polymorphism among individual golfers and the relationship between different golfers group. We analyzed the ACE gene polymorphism to study the individual differences among professional golfers (n=35), junior golfers (n=30) and general golfers (n=25). Genotype frequencies of DD, ID and II in total golfers (n=90) were 16.7%, 52.2% and 31.1% respectively. In professional golfers, the frequencies of DD, ID and II were 25.7%, 45.7% and 28.6% respectively. The frequency of DD genotype in professional golfers was higher than in junior golfers and in general golfers, but the II genotype in professional golfers was lower than in other groups. In conclusion, these data suggest that the capability and power of golf exercise are associated with the hereditary characteristics of the ACE polymorphism.

• Korean Journal of Applied Biomechanics
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• v.21 no.1
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• pp.57-65
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• 2011

This research was conducted to biomechanically analyze Tippelt motion in parallel bars, and establish technical understanding. To achieve that goal, the performances of the Tippelt acts carried out by five world top-class national gymnasts in the parallel bars 3-dimensional cinematographic analysis and EMG analysis were conducted and following conclusion were obtained. The Tippelt motions of excellent national gymnasts perform tap motion through the down swing of a large circular movements, and perform kick-out motion rapidly extending shoulder joint angle and hip joint angle with the trunk in a position close to perpendicular position at the vertical downwardness of the grasping the bars. At this time, if handstand starting the movement is too delayed or rapidly down swung, it was shown that from the initial falling, unnecessary muscular power was wasted in trapezius, anterior deltoid, erector spinae, latissimus dorsi, upper rectus abdominis, lower rectus abdominis. The muscular parts in tap motion generating muscle action potential were pectoralis major, rectus femoris, upper rectus abdominis, lower rectus abdominis, and those in kick-out motion were upper rectus abdominis, lower rectus abdominis, trapezius and anterior deltoid.

• The Korean Journal of Food And Nutrition
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• v.18 no.2
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• pp.127-134
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• 2005

This study was conducted to investigate the correlations among body composition, athletic ability and nutritional status according to BMI in Korean college students. The anthropometric measurements of three groups showed significant differences in weight, body fat, waist, hip, WHR, skinfold thickness(p<0.001). There were significant difference in vitamin A and niacin by their BMI(p<0.05). There were significant increase in trunk flexion(p<0.05) and maximal oxygen uptake(p<0.05) in subjects as their BMI. There were negative correlation between weight and foot balance, maximal oxygen uptake. Also, foot balance and maximal oxygen uptake were negatively related with BMI. There was a significant positive correlation between BMI and flexion(p<0.50). Grip strenth(p<0.01) and back strenth(p<0.05) were positively related with WHR. Overweight group was significantly inferior in muscular power and endurance but was better in muscular strength than the other groups. Based on this study, the further studies on obesity indice are required for health promotion among young women population.

• Physical Therapy Korea
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• v.14 no.3
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• pp.9-15
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• 2007

The purpose of this study was to investigate electromyographic activities of the flexor digitorum superficialis (FDS) and the flexor carpi ulnaris (FCU) by the shape of the ultrasound head. Twelve healthy subjects participated and performed ultrasound therapy with a round head and a long handled head during each 5-minute application. Electromyographic activities of the FDS and FCU were recorded by surface electrodes and normalized by maximal voluntary isometric contraction (MVIC) values. There was no difference in the muscular fatigue of FDS and FCU as determined by the shape of the ultrasound head (p>.05). Without the shape of head, the mean power frequency decreased with the time. There also was no difference in %MVIC of the FDS and FCU as determined by the shape of the ultrasound head (p>.05), but the force exerted exceeded 20%MVIC. There was however a significant difference in the amount of cumulative workload of the FDS and FCU as determined by the shape of ultrasound head (p<.05). The workload was however not affected by the shape of the ultrasound head. Constant static grasp of ultrasound transducer head during ultrasound therapy is considered a high risk factor of work-related musculoskeletal disease.

• Journal of International Academy of Physical Therapy Research
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• v.1 no.1
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• pp.36-44
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• 2010

This study has been conducted on the subjects of eight undergraduate students with abdominal obesity and eight undergraduate students with normal weight to find out correlation between substantial fatigue and Ratings of perceived exertion through analysis of their blood components when they took exercises to strengthen their abdominal muscular power. Comparatively analyzing HDL-C, LDL-C and lactic acid before and after they took sit-up at level of RPE 19-20, no statistically significant differences in HDL, LDL, lactic acid measures were observed between groups, but a significant difference in RPE was noted between groups(p<0.05) Our findings suggest that control group showed no significant difference in increase of fatigue material whereas the obese group showed a lower frequency of sit-up, though both groups took the same abdominal exercise. Additionally, the lower frequency of sit-up in obese group results from relatively higher Ratings of perceived exertion rather than increase of substantial fatigue material. This study invites future research that examines the effect of a comprehensive obesity exercise program combined with dietetic on ratings of perceived exertion in individuals with obesity.