대학 여자 멀리뛰기 엘리트 선수와 아마추어 선수의 각운동량 비교분석

신의수(Shin, Eui-Su) 한국체육과학회 2022 한국체육과학회지 Vol.31 No.5

The purpose of this study was to compare and analyze the angular momentum of the lower extremities and upper extremities and the resultant velocity of the COM(center of mass) in the long jump motions of elite female long jump athletes and amateur athletes. This study obtained the following results. First, the average angular momentum of the right arm of the elite female long jump athlete and amateur athlete during the long jump action was high in all events except Event 4, Event 5, and Event 6, and there was a significant difference in Event 8. Second, the average angular momentum of the left arm during the long jump of elite female long jump athletes and amateur athletes was high in all events except Event 3, Event 4, and Event 5, and there was a significant difference in Event 8. Third, the average angular momentum of the right leg of the elite female long jump athlete and amateur athlete during the long jump was high in all events except for Event 3 and Event 4. There was a significant difference between Event 3 and Event 8. Fourth, the average angular momentum of the left leg of the elite female long jump athlete and amateur athlete during the long jump operation was high in all Events except Event 1 and Event 5, and there was a significant difference in Event 8. Fifth, the average COM resultant velocity of the elite female long jump athlete and amateur athlete during the long jump action showed that the average COM resultant velocity of all Event elite athlete was high, showing a significant difference.

경호무도 수련 시 전방낙법 동작의 근활성도 분석

신의수(Shin, Eui-Su) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.6

The study is to present quantitative data needed to effectively control the impact force through the EMG(Electromyography) analysis of the students" security martial arts forward breakfall movement. The results of this study are as follows. First, t he m uscle activity o f the security m artial a rts forward break fall ready posture(E1) in t he movement, there was no significant difference. But that was observed muscle activity of the right and left of the erector spinae appear high, then the triceps, Pectoralis major, upper arm triceps appeared in order. Second, the muscle activity of the primary impact point(E2) in the security martial arts forward breakfall movement, there was no significant difference. But it was born with the right brachial triceps muscle activity appeared high on the left, and then appeared in the deltoid, Pectoralis major, erector spinae order. Third, the muscle activity of the secondary impact point in the security martial arts forward breakfall movement, there was no significant difference. Both are skilled it showed that the muscle activity of the right and left deltoid high, unskilled both the right and left of the Pectoralis major muscle activity showed that high. Fourth, the muscle activity of the secondary impact point in the security martial arts forward breakfall movement, there was no significant difference. Pectoralis major muscle activity was observed, however, the right and on the left appears high, then the triceps, the brachial triceps, those in the erector spinae order. This study concluded comprehensive if security martial arts forward breakfall movement of trains do when primary impact point at an effective shock absorption to the brachial triceps and deltoid to effectively use secondary impact point at the elbow in the coming shock reduction should be expected to be.

가사노동 설거지 시 테이핑과 스트레칭운동이 만성요통 주부에게 미치는 효과에 관한 생체역학적 연구

신의수(Shin, Eui-Su),김준식(Kim, Jun-Sik) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.6

The purpose of this study was to analysis the effects of lumbar taping and stretching exercise interventions on trunk range of motion, pressure pain, and lumbar muscle activity during housework washing dishes for chronic low back pain homemakers, and the following conclusions were drawn. First, it was found that lumbar taping and stretching exercise interventions were effective for trunk flexion, extension, left flexion, and right flexion during housework washing dishes for chronic low back pain homemakers. Second, it was found that lumbar taping and stretching exercise interventions were effective for low back tenderness during housework washing dishes for homemakers with chronic low back pain. Third, lumbar taping and stretching exercise interventions were also effective in L3 muscle activity during housework washing dishes for chronic low back pain homemakers. Summarizing the results of this study, it can be seen that simple lumbar taping and stretching exercise interventions were effective in the trunk range of motion, pain, and lumbar muscle activity during housework washing dishes for homemakers with chronic low back pain.

중학교 남자 체조선수 마루운동 착지 동작 시 상해요인의 운동학적 분석

신의수(Shin, Eui-Su),최정규(Choi, Jung-Kyu),김상두(Kim, Sang-Doo) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.3

The purpose of this study is to conduct a kinematic analysis on the causes of injury when six. Athletes of a sports middle school in city D carry out their 360° twist landing in floor exercise. The study results offered the following findings. First, the time it took to carry out the landing was .14 ±.04 s. Second, the range of motion in the CM(center of mass) on the left and right was within .03 ±.02 m, and within 34 ±. 09m for front and back. The range of motion in CM vertically was within .15 ±. 04 m. Third, the CM horizontal velocity was 2.72 ±. 24 m/s for Event 1 and 1.83 ±.69 m/s for Event 2. The CM vertical velocity was -2.96 ± 45 m/s for Event 1 and -.28 ±. 24 m/s for Event 2. Fourth, during landing the joints in the hip, knees and ankles were bended. The range of angle during bending was, in the order of hip joints, knee joints and ankle joints. Fifth, the outward rotation angle of the knee at landing was reduced. Taken together, the above findings suggest that taking more time when landing through a 360° twist landing movement and having an appropriate bending range for the lower limb joints can help reduce the cause of injury. It also seems important to reduce the outward rotating angle of the knees.

무도 전방낙법 동작 시 충격력 감소 요인의 운동역학적 분석

신의수(Eui Su Shin),오정환(Cheong Hwan Oh),홍수영(Soo Young Hong),박찬호(Chan Ho Park) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.57

The purpose of this study was to provide basic quantitative data to minimize the impact occurring during forward breakfall by the comparative analysis of kinetic factors through 3D motion analysis and analysis of GRF of the forward breakfall of the martialarts targeting 10 skilled and 10 unskilled subjects. The following are the findings. First, the total time taken for forward breakfall of the martial arts showed 1.53±0.04 s for skilled, and 1.41±0.06 s for unskilled subjects. Second, forward breakfall of the martial arts operation showed significant left and right position of center of mass in P2, P3, and P4. In addition, the unskilled subjects showed larger forward and rearward position in P1, P2, P3, and P4, while the skilled subjects showed larger vertical position in P2. And the unskilled subjects showed faster forward and rear movement of center of mass in P2, P3, and P4, respectively. And unskilled subjects showed faster vertical velocity of center of mass in P2 and P3. Third, as for the upper extremity joint angle during forward breakfall, skilled subjects showed larger right shoulder joint angle in P4, and unskilled subjects showed larger left shoulder joint angle in P2 and P3. Unskilled subjects showed greater elbow joint angle both right and left side in P1 and P3, and skilled subjects demonstrated larger wrist joint angle both right and left side in P1. Fourth, the forward breakfall of the martial arts did not show any difference between left and right side in the GRF, but unskilled subjects proved a significantly greater forward and backward GRF in the secondary point of impact(E3) both right and left sides. The skilled subjects showed a significantly greater vertical GRF in the primary point of impact (E2), and unskilled subjects showed a larger vertical reaction force in the secondary point of impact (E3), respectively.

측방낙상과 측방낙법 동작의 운동역학적 비교분석

신의수(Shin, Eui-Su),최정규(Choi, Jung-Kyu),김상두(Kim, Sang-Doo) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3

The purpose of this study was to provide a quantitative base data needed to minimize physical injuries from side fall by comparing and analyzing the kinetic of the motion of side fall and side breakfall. The subjects for the motion of side fall were five healthy male university students, while the subjects for the motion of side breakfall were five male black belt holder. For the video recording, nine high speed cameras (Motionmaster 100, KOR) were used and for the analysis of impact force, a force plat (AMTI, USA) was used. To analyze the video and impact force, the program Kwon3d XP(Visol, KOR) was used. Using the technical statistical of SPPSS 18.0 program, the average and standard deviation were calculated and an independent t-test conducted to verify the difference between groups. The conclusions drawn from this study are as follows. First, the duration time was longer for side breakfall at P2 (p<.05), while there was no significant difference in total duration time. Second, the COM(center of mass) position was shortest for the left/right and front/back range of side breakfall, and there was a statistically sifnificant differecne at E2 and E3(p<.05). Third, the COM(center of mass) velocity was slowest for side breakfall at E3 where the impact force of the hip is at its highest, with a statistically significant difference (p<.05). Fourth, the impact velocity of the hand when it hits the ground at E2 showed the highest for side brekfall with a statistically significant difference (p<.05). Fifth, the impact velocity of the hip was highest for side breakfall at the left/right velocity and vertical velocity, with a statistically significant difference (p<.05). The greatest impact force of the hip was 1.06 BW for side breakfall and 2.15 BW for side fall with as tatistically significant difference (p<.05). Synthesis of the results is as follows. Suggest that in order to reduce hip impact force, the following factors are important. Side fall during a long time and you need to slow down the COM velocity. And you should slow down the impact velocity of the hip.

청소년의 스마트폰 사용 중 간헐적 경부 스트레칭 운동이 근골격계 건강위험요인에 미치는 영향

신의수(Shin, Eui-Su) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4

The purpose of this study was to analyze how intermittent stretching exercise affects musculoskeletal health risk factors(neck range of motion, muscle activity, pressure pain) when using the smartphone in adolescents. The results of this study are as follows. First, there was no significant difference in musculoskeletal health risk factors pre and post smartphone use in the experimental group. Second, there were significant differences in musculoskeletal health risk factors pre and post smartphone use of the control group. Third, there was no significant difference in musculoskeletal health risk factors before the use of smartphone in the experimental group and the control group. Fourth, the musculoskeletal health risk factors before the use of smartphone in the experimental group and the control group showed a significant difference in muscle activity of the levator scapula, and no significant difference in other factors. From the above results, it was found that when adolescents use their smartphones for 60 minutes without stretching exercises in a chair sitting position, it was found that the musculoskeletal system (neck range of motion, muscle activity, pressure pain) was negatively affected, but 15 minutes It was found that the negative effects on the musculoskeletal system were significantly reduced when simple neck stretching exercises were performed in units.

물구나무서서 다리 벌려 앞구르기 동작의 운동학적 분석

신의수(Shin, Eui Su),이수근(Lee, Soo Keun) 한국체육교육학회 2022 한국체육교육학회지 Vol.27 No.2

용무도 앞굴러치기 동작의 운동역학적 분석

임재오(Lim, Jae-O),신의수(Shin, Eui-Su),이광무(Lee, Kwang-Moo),이재훈(Lee, Jae-Hun) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4

The purpose of this study is to kinetic analysis of the apgulleochigi motion of Yongmoodo. And the kinematic variables such as the duration time, COM(center of mass) displacement and velocity, the maximum impact force at landing were analyzed. And the following conclusions were drawn. First, the duration time of the apgulleochigi motion of Yongmoodo was 0.42±0.06 s in P1, 0.48±0.06 s in P2, 0.24±0.10 s in P3, and the total time was 1.14±0.16 s. In addition, the time required for each section during apgulleochigi motion of Yongmoodo showed a long duration time in the order of P2, P1, and P3. Second, the left and right displacements of COM of apgulleochigi motion of Yongmoodo were 0.40±0.05 m for E1, 0.39±0.03 m for E2, 0.39±0.08 m for E3, and 0.37±0.07 m for E4. The displacement before and after COM was 0.52±0.28 m for E1, 0.86±0.22 m for E2, 1.44±0.12 m for E3, and 1.86±0.13 m for E4. COM vertical displacement was 0.99±0.03 m for E1, 0.68±0.04 m for E2, 0.55±0.12 m for E3, and 0.31±0.01 m for E4. Third, the COM left and right velocity of apgulleochigi motion of Yongmoodo are -0.03±0.07 m/s for E1, 0.00±0.07 m/s for E2, -0.02±0.18 m/s for E3, and -0.13±0.33 m/s for E4. The velocity before and after COM was 0.69±0.22 m/s for E1, 0.86±0.18 m/s for E2, 1.56±0.52 m/s for E3, and 2.03±0.15 m/s for E4. The COM vertical speed was -0.36±0.15 m/s for E1, -0.89±0.17 m/s for E2, -1.19±0.44 m/s for E3, and -0.03±0.34 m/s for E4. Fourth, in the apgulleochigi motion of Yongmoodo, the maximum impact force generated by the hand closing to the ground was 1.76±0.25 BW. In summary, in the apgulleochigi motion of Yongmoodo, it would be advantageous to increase the duration of P1 and increase the impact speed upon landing in order to minimize the impact. In addition, it is judged that the impact force is reduced as the right arm is closer to the ground before the upper body is lowered and the vertical velocity of the COM is slowed down during an impact.

복싱 원·투 스트레이트 동작의 운동역학적 특성 분석

오정환(Oh, Cheong-Hwan),신의수(Shin, Eui-Su),김진표(Kim, Jin-Pyo),노대성(Rho, Dae-Sung) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.6

The purpose of this study was to through the kinetics analysis on the one-two straight punch motion in boxing, Provide the basic data by which a training method can be found to improve the boxing techniques for the beginners and experts. To do so, this study chose 4 boxing players as test objects and recorded their motions to analyze time consumed, the velocity and distance of a fist, the angles of a joint and ground reaction force. For the video recording, 9 infrared cameras (Motionmaster 100, Visol) and 2 force platform (AMTI, USA) were used to measure ground reaction force. The recorded data was analyzed by Kwon3D XP program and the findings are as follows; First, phase of a left straight punch took a short time in the total distance time. Second, compared to the left straight distance time, the right straight took a longer distance time and a faster instantaneous velocity. Third, lower limb Joints showed more dynamic than right ones. And ankle joints showed more motions than buttock ones. Fourth, at the impact moment of left and right straight punches, resultant of the ground reaction force(GRF) were exerted on the front foot for both punches.