대학생의 하지 근량과 골밀도 및 근기능의 관계 분석

유정완 ( Jung Wan You ),이소은 ( So Eun Lee ) 한국발육발달학회 2016 한국발육발달학회지 Vol.24 No.3

The purpose of this study to clarify the relationship of muscle mass, bone mineral density, and muscle function in male and female for providing basic data for customized training for improving bone mineral density according to gender. As a result muscle mass of male university students had significant relationship with bone mineral density, and became clear that muscle mass and bone mineral density is closely related to muscle power and muscular extension strength. The subjects of this study was 15 males, 10 females, totalling 25, and measured muscle mass, bone mineral density and muscle function. Bone mass of male university students turned out to be associated with bone mineral density(p<.05), and indicated that muscle mass and bone mineral density is correlated to muscle power and muscular extension strength(p<.05). Bone mass of female university students did not show significant relationship with bone mineral density, but showed significant relationship with both extension and flexion muscle strength of muscle functions(p<.05). In addition, bone mineral density had significant relationship with muscle power and muscle strength, as well as muscle endurance of extension and flexion muscle strength (p<.05). In conclusion, it became clear that exercise application for increase of lower limb muscle mass for male university students aids in improving bone mineral density in order for muscle mass and bone mineral density to show instantaneous lower limb muscle power and muscle strength. Whereas, same exercise application for female university students increases muscle mass which largely effects muscle function and help maintain high bone mineral density to aid in muscle function.

Effect of carbohydrate ingestion on fuel metabolism during prolonged treadmill walking

You, Jung-Wan(유정완),Choi, Seung-Wook(최승욱) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.4

To study the effects of carbohydrate (CHO) ingestion on intermittent fuel metabolism changes during prolonged treadmill walking, seven healthy male subjects performed 120 minutes walking on a treadmill at a speed of 80 m/min with (GLU) and without (CONT) glucose ingestion 1 hour prior to the exercise. During this experiment, blood samples were collected to analyze the concentrations of plasma glucose, lactate and triglyceride. Respiratory gas was carried into the gas analyzer to measure oxygen uptake (VO₂), elimination of carbon dioxide (VCO₂) and pulmonary ventilation (VE). The rates of CHO/fat oxidation were intermittently calculated by means of gas exchange measurements (CHO oxidation = 4.21*VCO₂ - 2.962*VO₂; Fat oxidation = 1.695*VO₂ - 1.701*VCO₂; Jeukendrup JE and Wallis GA, 2005). Plasma glucose was significantly higher (P<.05) in GLU than CONT from the onset of the exercise to the period of 60 min. There were no significant differences in triglyceride between GLU and CONT during exercise. Respiratory exchange rate (RER) decreased gradually in both experiments and showed higher in GLU than CONT throughout the exercise. More contribution of fat oxidation was found in CONT than GLU during the exercise. The contribution rates of CHO/fat oxidation were equal at 40 min and 120 min in CONT and GLU, respectively. The oxidation rates were approximately 300 mg/min in both experiments and there were no significant difference in the volumes of whole oxidation rates between GLU and CONT during the exercise. These findings suggest that prolonged walking at moderate speed glucose ingestion prevents consuming fat even after 120 min of exercise.

중학생의 운동습관이 자아존중감 및 스트레스에 미치는 영향

유정완(You, Jung-Wan),심유진(Shim, Yoo-Jin),김규태(Kim, Kyu-Tae) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.5

The purpose of this study is to investigate the effects of long-term and regular exercise habits of middle school students on self-esteem and stress, which are mental aspects. The subjects were 106 middle and high school students (61 males, 45 females) attending S middle school in Seoul, and their exercise habits, self-esteem and stress scale were analyzed using questionnaires. In the exercise period of exercise habit, there were significant differences in self-steem and stress-related study, school, grades and test areas according to period of exercise(p <.05). The difference in exercise time of the exercise habits affected the self-esteem and stress only in self-esteem(p <.05). However, the difference between exercise frequency and exercise intensity did not show any significant difference in all areas of self-esteem and stress scale. The results of this study showed that middle school students with exercise habits have higher self -esteem and lower stress than students without exercise habits. Also, it was found that regular exercise habit of about 1 year plays an important role in enhancing self-esteem and lowering stress of middle school students. In addition, exercise habit which did not exceed 2 hours positively influenced the self-esteem of middle school students to increase.

성인뇌성마비의 운동능력이 유산소능력에 미치는 영향

유정완(You, Jung-Wan),심유진(Shim, Yoo-Jin),양윤권(Yang, Yoon-Kwon) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.6

The aim of the study was to examine the relationship between Motor Ability and aerobic capacity based on the fact that GMFCS(Gross Motor Function Classification System) is closely related to Shuttle Run Test in adults with cerebral palsy(CP). The subjects were ambulant adults with CP(N=46; GMFCS Level Ⅰ=14, Ⅱ=29,Ⅲ=3). Motor Ability and aerobic capacity were measured in this study. The Shuttle Run Test I was developed for adults at GMFCS level Ⅰ, and the Shuttle Run Test Ⅱ was developed for adults at GMFCS level Ⅱ, Ⅲ. As a result, GMFCS in CP showed significant difference in distance(m) test of Shuttle Run Test(p<.05), GMFCS Level was significantly larger than either Level Ⅱ or Level Ⅲ(p<.05). Also, time(min) of Shuttle Run Test showed significant difference in level of motor functions(p<.05), and Level Ⅱ was significantly larger than Level Ⅲ(p<.05). In conclusion, exercise function of CP has influence of aerobic capacity. Especially, GMFCS had close relations with exercise distance(m) of Shuttle Run Test which is an indirect measurement of aerobic capacity.

커피 및 카페인 섭취가 상지운동 시의 에너지 기질에 미치는 영향

유정완(You, Jung-Wan),이소은(Lee, So-Eun) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.2

The purpose of this study is to investigate the effect of caffeine and coffee on energy metabolism during upper limb exercise in healthy male students, based on the fact that caffeine has various effects on the body during exercise. As a result, the heart rate gradually increased as the exercise started in both the control experiment, the caffeine experiment and the coffee experiment. Adrenaline levels were significantly different between before and after caffeine and coffee experiments, but also before and after caffeine and coffee intake (P<.05). On the other hand, the concentration of noradrenalin was significantly different between before and after ingestion and before exercise in the coffee experiment (P<.05). In addition, the total carbohydrate metabolism of VO2 and VCO2 did not show any significant difference between experiments of each condition, but looking over a period of time, the coffee experiment had significantly higher total carbohydrate metabolism than control experiment and caffeine experiment between 10 to 20 minutes after the start of exercise (P<.05). Total fat metabolism showed significant difference between the caffeine and coffee experiments at the end of exercise (P<.05). However, there was no statistically significant difference between 0 and 10 minutes after the start of exercise, but after 10 minutes, the caffeine test was significantly higher than the control and coffee tests (P<.05). In conclusion, caffeine was affecting heart rate, adrenaline concentration and fat metabolism during arm ergometer exercise. Coffee also had effects on heart rate, adrenaline concentration, noradrenaline concentration and carbohydrate metabolism and was physiologically influenced during exercise. However, there are also some components that show significant differences between caffeine and coffee, and it is considered that the ingredients contained in coffee interfere with the function of caffeine.

대학생의 운동습관이 보행운동에 미치는 영향

유정완(You, Jung-Wan),김아람(Kim, A-Ram),백승희(Baek, Seung-Hui) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6

This study was conducted on 10 male students; 5 who were exercising regularly 4 days or more weekly with exercise habits as exercise group, and 5 male students who exercise less than once a week without exercise habits as non-exercise group. The purpose of this study was to investigate if there is any difference between the locomotive movements of a young adult in accordance with the movement habits, what causes the difference, and to verify what it means from physiological perspective. While the stride length slightly increased during exercise in both condition for exercise group, the non-exercise group showed a slight increase in 80m walking but decrease in 100m waling(p<.05). During 80m resting/walking and 100m resting/walking, the average heart rate was significantly higher for the non-exercise group than for the exercise group(p<.05). The HR of non - exercise group was significantly higher than that of exercise group in 80m walking(p<.05), and the HR of the non-exercise group kept increasing compared to little change for the exercise group. Also, 100m walking showed the same tendency when walking at 80m(p<.05). 100m walking was significantly higher in non - exercise group than in exercise group during latter trend(p<.05). Especially during 100m waling, the HR was significantly lowered to show a significant difference(p<.05). Both the grip strength and one-legged stand tend to be higher in the exercise group, but the significant difference was recognized. Back muscle strength, knee extension power and sit-ups were significantly higher in the exercise group than in the non-exercise group(p<.05). There was a significant positive correlation between knee extension power and stride change(p<.05, r=.69). In Conclusion, Considering the effect of age and declining muscle strength and declining strength of modern young adults, the walking problems in youth cannot be avoided. Therefore, it is necessary to strengthen walking ability by deepening the understanding of the problem of walking and exercise regularly from adolescence.

듀에슬론 경기의 레이스 성적에 영향을 미치는 신체적 및 생리학적 요인에 관한 연구

유정완(You, Jung-Wan),김아람(Kim, A-Ram),심유진(Shim, Yoo-Jin),김규태(Kim, Kyu-Tae) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.3

The purpose of this study is to identify the physical and physiological factors that affect the performance of the du-athlon competition for college triathlon athletes. Subjects were 12 healthy male college students from the triathlon club. Each race performance is composed of first run 4.3km, bike 36.9km, and the second run 4.5km, total distance of 45.7km which is the official race record of the du-athlon. The experiment consisted of ① an incremental load running test using a treadmill (Run Test), ② a gradual submaximal bike test of running and cycling using a treadmill and a bicycle ergometer a (Run-Cycle Test), and ③ cycling and running gradual submaximal test (Cycle-Run Test) was conducted three times. Examining the Stepwise Multiple Regression Analysis of the physical and physiological factors affecting race results, of the maximum speed of the treadmill measured in the Run Test and the two measurements in CE from the Cycle-Run Test were detected as factors affecting the race performance. The correlation coefficient was 0.82 and detected two measurements can be used to predict race outcomes by 84%. In conclusion, from the results of this experiment, maximum power at maximum speed of treadmill in running race and effective endurance was needed in the bike race for du-athlon competition. Especially, for cycle race, which takes up most part of the du-athlon race, it appears that the power which can sustain a constant load for a long time and long distance is thought to be important.

脳性麻痺者の関節可動域と運動能力の関係

유정완(You, Jung-Wan) 한국체육과학회 2022 한국체육과학회지 Vol.31 No.5

Studies so far have not clarified the relationship with ROM by directly measuring the motor ability in adult with cerebral palsy, even though ROM is closely related to motor ability. Therefore, the purpose of this study is to reveal the relationship between AROM and motor ability based on the close relationship between ROM and motor ability of cerebral palsy. The subjects of this study were 101 adults with cerebral palsy (63 men and 38 women, 36.4±8.9 years old in average age, 162.8±9.6 cm in average height, 59.6±11.2 kg in weight, and 22.5±3.7 kg・m-2 in BMI) using three cerebral palsy welfare centers in Korea. The ROM measurement was performed by measuring the AROM (Active Range of Motion), and the items were 25 parts of 7 regions of the whole body. In addition, the motor ability measurements were a total of 10 items of motor ability (grip strength, shoulder strength, sit-up, left-back, and softball throwing) which mainly uses the upper extremities, and 5 items of motor ability (50 m running, side steps, single leg stance, standing long jump and 10 m shuttle run test). As a result of analyzing the correlation between AROM and motor ability, significant correlation with all exercise abilities was recognized in the ablation and under burst of foot joints in AROM (p<.05). In particular, in the relationship between the bowing of the foot joint and standing long jump, the highest value of all correlation coefficients was shown (p<.01). On the other hand, extra-shoulder joint rotation was not recognized to be correlated with all motor skills. In addition, there was less motor ability that showed a significant correlation with neck joint flexion and elongation, intra-shoulder joint rotation, and wrist joint extension. Most of the AROMs of the upper extremity were recognized to have a significant correlation with grip strength, shoulder muscle strength, and trunk forward flexion (p<.05). In addition, most of the AROMs in the lower extremities were significantly correlated with sit-ups, convulsions, softball throwing, 50m running, side steps, single leg stance, long jump, and shuttle run test (p<.05). Taken together, the development of foot and hip AROM among lower limb joints is considered the most important to obtain high motor skills in ambulatory cerebral palsy.

성인 뇌성마비의 관절가동범위가 건강관련 삶의 질에 미치는 영향

유정완(You, Jung-Wan),김규태(Kim, Kyu-Tae),김아람(Kim, A-Ram),최승욱(Choi, Seung-Wook) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.2

This study was based on the fact that the physical and motor performance of CP (Cerebral Palsy; CP) is closely related to the quality of life (QOL), and the objective was to clarify the relationship between the whole range of ROM (ROM) and the Health-Related Quality of Life (HRQOL). As a result, cervical spine (rotation), shoulder (flexion & extension, abduction & adduction) of the upper body ROM showed a significant correlation (.366~.448) with physical functioning (P<.05). Lower body hip (flexion & extension) and Physical functioning, hip (abduction & adduction) with Physical functioning, Social functioning, Mental health, Physical Summary Score, and Mental Summary Score, correspondingly showed a positive correlations (.278~.541)(P<.05). And knee (internal rotation & external rotation) showed a significant correlation (.278 ~ .350) with physical functioning, mental health, and mental summary score (p<.05). Finally, ankle (dorsiflexion & plantarflexion) showed a positive correlation (.331~.455) with Physical functioning, Vitality, Social functioning, Role emotional, Mental health and Mental Summary Score (p<.05). In addition, the Mental Summary Score was closely related to ankle (dorsiflexion & plantarflexion) and shoulder (flexion & extension) (p<.05) and was a predictor variable that could account for 30% of the mental summary score. In conclusion, ROM of the lower body, rather than upper, of adult CP showed a close relationship with HRQOL in the whole body ROM of the adult CP, and it became clear that it has a great influence on the mental summary score. And also, ankle and shoulder ROMs were found to be important predictors of the Mental Summary Score.

중학생의 운동습관이 학교생활만족도에 미치는 영향

유정완(You, Jung-Wan),이소은(Lee, So-Eun) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.5

Present study aims to investigate how exercise habit, both existence and type (frequency, duration, time, intensity), affects school life satisfaction in middle school students. As a result, students who had exercise habits showed significantly higher levels of relationship with teachers and peers, and class activities (not learning activities) than those who does not have an exercise habit(p<.01). The number and duration in exercise habits did not affect school life satisfaction, but exercise time and intensity showed significant difference in peer relationship and learning activities among sub-areas of school life (p<.05). This study clearly showed that middle school students with exercise habits had higher overall school life satisfaction than the students without exercise habits. In addition, although exercise duration and frequency in exercise habit did not affect school life satisfaction, it became clear the exercise habit with moderate to vigorous intensity and 1hour to 2hour of appropriate exercise had positive impacts on peer relationships and class activities in school life.