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테니스 양손 백핸드 스트로크 시 스웡타입에 따른 라켓헤드속도와 라켓 면각도 비교분석
서국은(Seo, Kook-Eun),강영택(Kang, Young-Taek) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.6
The purpose of this study was to analyze the difference between swing types during a open stance and to enhance performance and skill. Six male university players were the subjects, and the mean difference between the kinematic variables such as the velocity of racket head, X, Y, Z components velocity of racket head, angle of racket face in a two-handed backhand stroke through a three-dimensional motion analysis. The test data was analyzed by a paired t-test, and the alpha level of α = .05 was set for all tests of significance. The findings of the study were as follows; First, there was difference in the velocity of racket head to E2, E3, E4 event of the two swing types during the open stance. Second, there was difference in the drive swing to x components velocity and the top spin swing to z components velocity between the two swings types during the open stance. Third, there was no difference in the angle of racket face of the two swing types during the open stance.
테니스 양손 백핸드 드라이브 스트로크 시 볼 방향성에 따른 수평회전운동 비교분석
서국은 ( Kook Eun Seo ),정용민 ( Yong Min Chung ),강영택 ( Young Taek Kang ) 한국운동역학회 2015 한국운동역학회지 Vol.25 No.3
Objective : The purpose of this study was to compare the kinematic data of the horizontal rotation movements of shoulder, hip, knee during two-handed backhand drive stroke according to two different ball directions. Methods : The kinematic variables were analyzed such as the joint angles of the lower body, horizontal rotation angles of the shoulder, hip, inter-knee segment, body twist angle and difference in angle of forward swing. Two-handed backhand drive stroke was analyzed through a three-dimensional motion analysis. The collected data were analyzed by a paired t-test, and the statistical significant value was set at α=.05. Results : The findings of this study were as follows; First, there was no difference in the total angles of lower limb joints from the forward swing position to impact posterior. Second, there was no difference in the horizontal rotation angles of E1 shoulder, hip, and E2 shoulder but the horizontal rotation angles of E1 knee, E2 hip, knee, E3, and E4 shoulder, hip, and knee were different in all events. Third, there was no difference in the body twist angle of the maximum horizontal rotation. In addition, there was no difference in the angle of the body twist by the ball direction in the shoulder-hip, the hip-knee and the shoulder-knee. Conclusion : Horizontal rotation angle determines ball directions.
워블보드 운동과 윈드서핑 운동이 외발서기 시 COP와 COM에 미치는 영향 비교
신승우(Shin, Seung-woo),서국은(Seo, Kook-Eun),양승호(Yang, Sung-Ho),정의태(Jung, Eui-Tay),박태진(Park, Tae-Jin) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2
This research was to analyze the impact of wobble board and wind surfing to static balance ability targeting 22 male students who were divided into groups. Each group composing 11 participants were trained for 6 weeks and conducted ground reaction force and image analysis. Using spss 21.0, evaluation of differences within groups before and after the exercise was paired t-test, and Independent t-test was performed by calculating %diff values of before and after the exercise for the difference and signification was set as α=.05. The research resulted that while standing with one-leg keeping eyes open, the change of distance and moving range centered to pressure and mass after the two group’s training was decreased. Right/Left distance and area focused on pressure while keeping eyes open was decreased significantly in windsurfing group. In the comparison according to time information among groups, right/left moving distance based on pressure was significantly decreased in wind surfing group. Preformed environment of wind surfing and wobble board is not different, but it was revealed that proprioception was stimulated due to its unstable supporting surface and this affects positively to static balance. In the kinetic analysis, wind surfing was discovered to have better effect than the other one.
이은영(Lee, Eun-Young),서국은(Seo, Kook-Eun),정우주(Jung, Woo-Ju),데이비드 오설리번(O`Sullivan, David) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.6
The overall purpose of this study was to investigate the uselfulness of a smart good posture cushion. The study was divided into 3 separate sections. The first section was to examine the correlation between the cushion’s pressure output with the ground reaction force to validate its pressure sensor. The second section, was to investigate the repeatability of the cushion to provide feedback for anterior trunk flexion, left and right lateral trunk flexion. The third section, was to investigate the effect of using the good posture cushion on the kinematics of a participant sitting using the good posture cushion with and without its vibration feedback for 30 minutes. The results show a strong relationship between the ground reaction force and the cushions pressure. For the second section, the results highlight the large variations in feedback within and between individuals. For the third section, the results show no signification kinematic differences over the 30 minutes, however the cushion records that the participant sat in a good posture longer when provided with the vibration feedback. In conclusion, the good posture cushion may not be a perfect tool for recording deviations in sitting posture but it may be useful as a reminder for people to sit up in a better posture.
자이로키네시스 운동이 만성허리통증을 호소하는 여성 사무직 근로자들의 정적밸런스 시 COP에 미치는 영향
박소연(Park, Soh-Youn),서국은(Seo, Kook-Eun),박태진(Park, Tae-Jin) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5
The purpose of this study was to analyze the effects of Gyrokinesis exercise on sagittal spinal alignment, static balance of office workers who had a Chronic Low Back Pain. The subjects of this study are 18 female among the sedentary workers, whose age range from late 20 to late 30. The exercise program consists of 70min/day, 2 days/week for 8 weeks. All data were analyzed by paired-t test using SPSS version 21.0, calculated %diff values of before and after the exercise for the difference and signification was set as α=.05. In terms of COP after the exercise, showed decrease in s everal a spects ; sway distance, total sway distance, sway range, sway area, sway speed and velocity. In a further study, a great quantity of researches on spinal alignment are necessary in regards of the Gyrotonic exercise as a spine -focussed-exercise. Not only office workers, COP of the static balance but also various dynamic variables should be studied.
12주간의 하타요가 수련이 여고생의 자세제어 능력 변화에 미치는 영향
김윤경 ( Yun Kyung Kim ),서국은 ( Kook Eun Seo ),공세진 ( Se Jin Kong ),김진현 ( Jin Hyun Kim ) 한국스포츠정책과학원(구 한국스포츠개발원) 2016 체육과학연구 Vol.27 No.1
본 연구의 목적은 12주간의 하타요가 수련이 여고생의 자세제어 능력 변화에 미치는 영향을 규명하는 것이다. 27명(요가수련그룹 15명, 비교그룹 12명)의 건강한 여고생을 대상으로 하였으며 12주간의 운동 프로그램 전 후에 3차원 동작 측정 시스템과 지면 반력 측정 시스템을 이용하여 COP, Rambling(RM), Trembling(TM)의 변화와 시상면의 자세 변화를 측정 하였다. 산출된 자료는 SPSS 21.0을 이용하여 그룹간 사전 값 차이를 검증에는 독립표본 t-검증, 12주간 요가 수련 후 그룹 내 시기에 따른 변화 검증은 대응표본 t-검증, 요가 수련 전, 후의 시기와 그룹의 상호작용을 검증하기 위해서는 이원배치반복분산분석(two-way rm ANOVA)을 실시하였다. 또한, 통계적 유의수준은 a=.05로 설정 하였다. 분석결과 요가 수련 그룹에서 COP의 전후 이동 범위가 줄어들었고, RM과 TM에도 긍정적 변화가 있었다. 시상면의 자세 정렬에는 요가 수련 후 목 분절의 전방 각도가 줄어들었다. 이는 하타요가 수련을 통해 인지된 자세조절의 메커니즘이 발현된 결과이며, 하타요가 수련은 여고생의 자세제어 능력 변화에 긍정적 효과가 있는 것으로 판단된다. The purpose of this study was to examine the influence 12 weeks of Hatha yoga exercise has upon changes in postural control ability of high school girls. The research subjects were 27 high school girls (yoga group: 15, control group: 12). Changes that took place after yoga exercise were comparatively analyzed after having them train Hatha yoga for 12 weeks. The research variables that were measured were the moving range of COP in static postural balance, Rambling & Trembling in the moving range of COP, and postural change in the sagittal plane. The mean and the standard deviation(SD) were calculated on each measurement item by using the SPSS Ver 21.0 statistical program. To verify difference in pre-value between groups, an independent t-test was carried out. The verification of change according to time within the group after 12 weeks of yoga exercise was conducted in a paired t-test. To inspect interaction by time and group before and after yoga exercise, two-way repeated measures ANOVA was implemented. As a result, the moving distance of the pre and post direction in the moving range of COP was reduced. Rambling and Trembling in the pre-and-post direction significantly decreased. And in postural change of the sagittal plane, there was significant interaction between two groups in the neck and thigh parts. It was thought that the 12 weeks hatha yoga exercise has positive influence upon improving the postural control mechanism in female high school students and has an effect even on change in the postural control ability of an individual.
H/Q 비율이 태권도 발차기시 지지다리의 무릎 관절 모멘트와 지면반력에 미치는 영향
김수정(Kim, Soo-Jeong),서국은(Seo, Kook-Eun),김석태(Kim, Suk-Tae),박태진(Park, Tae-Jin) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.2
This study is aimed at providing basic data on the injury of support legs by assaying the relation between the ratio of hamstring and quadriceps and knee joint through analysis on kinetical and kinematical factors appearing in accordance with the ratio of hamstring and quadriceps of support leg when kicking at Taekwondo. The variable factors of this study are kicking time, knee joint moment of support leg, ground reaction force. The variable factors resulted from comparison between the two groups included maximum moment of knee extension and ground reaction force at the arising time of maximum moment of knee extension, while the group with asymmetric muscular strength increase maximum knee extension moment and decrease ground reaction force than that with symmetric one. In the comparison of kickings by types within each group showed same pattern in both. Through such result, it was expiscated that asymmetric ratio of hamstring and quadriceps of support leg when kicking at Taekwondo may possibly cause injury arisen from overload on knee joint by maximum knee extension moment, therefore, developing muscular force symmetically is important at Taekwondo practices.