• 한국운동역학회지
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• 제30권1호
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• pp.17-25
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• 2020

Objective: The purpose of this study is to provide a better understanding of long turn mechanism by describing long turns after kinematic analysis and provide skiers and winter sports instructors with data through which they are able to analyze right postures for turns in skiing in a systematic, rational and scientific manner. Method: For this, a mean difference of kinematic variables (the center of gravity (CG) displacement of distance, trajectory, velocity, angle) was verified against a total of 12 skiers (skilled and unskilled, 6 persons each), regarding motions from the up-start to down-end points for long turns. Results: First, concerning the horizontal displacement of CG during a turn in skiing, skilled skiers were positioned on the right side at the upstart and edge-change points at a long turn. There was no difference in anteroposterior and vertical displacements. Second, in terms of CG-trajectory differences, skilled skiers revealed a significant difference during a long turn. Third, regarding skiing velocity, skilled skiers were fast at the edge-change and maximum inclination points in long turns. Fourth, there was no difference in a hip joint in terms of a lower limb joint angle. In a knee joint, a large angle was found at the up-start point among skilled skiers when they made a long turn. Conclusion: In overall, when skilled and unskilled skiers were compared, to make a good turn, it is required to turn according to the radius of turn by reducing weight, concerning the CG displacement. Regarding the CG-trajectory differences, the edge angle should be adjusted via proper inclination angulation. In addition, a skier should be more leaned toward the inside of a turn when they make a long turn. In terms of skiing velocity, it is needed to reduce friction on snow through the edging and pivoting of the radius or turn according to curvature and controlling ski pressure. Regarding a lower limb joint angle, it is important to make an up move by increasing ankle and knee angles instead of keeping the upper body straight during an up motion.

• 한국운동역학회지
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• 제24권3호
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• pp.189-199
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• 2014

The purpose of this study was to compare pflugbogen's biomechanical characteristics between on the ski simulator and snowed ski slope to develop interactive ski simulator. Nine ski instructors(sex: male, age: $29.6{\pm}5.4yrs$, height: $176.0{\pm}5.6cm$, body mass: $76.0{\pm}14.0kg$) belong to Korean Ski Instructors Association participated in this research. 24 Infrared cameras for snowed ski slope experiment and 13 infrared camera for ski simulator experiment were installed near by path of pflugbogen. The participants did pflugbogen on the snowed ski slope and the ski simulator both. During the experiment, the participants weared motion capture suit with infrared reflective makers on it, and plantar pressure sensors in ski boots, so that ski motion and plantar pressure data were collected together. Displacement of COG(center of gravity) movements, trunk flexion/extension angle, adduction/abduction angle, and plantar pressure data were significantly different between on the simulator and ski slope. However, percentage of time of COG movement in the phases during medial/lateral and anterior/posterior movement were not significantly different. Findings indicate that the difference between two groups occurred because the ski simulator's drive mechanism is different from ski motion on the slope. In order to develop the ski simulator more interactively for pflugbogen, the ski simulator's drive mechanism need to be reflected 3D motion data of pflugbogen on the slope that were purposed in this research.

• 한국운동역학회지
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• 제27권4호
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• pp.257-262
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• 2017

Objective: This study aimed to investigate the differences in skiing time and vertical ground reaction force (vGRF) between the basic parallel turn and short turn. Method: Eleven alpine ski instructors (age: $28.73{\pm}4.29yrs$, height: $172.36{\pm}6.30cm$, body mass: $71.45{\pm}9.16kg$, career: $11.09{\pm}2.70yrs$) participated in this study. Each skier was asked to perform a basic parallel turn and short turn on a $16^{\circ}$ groomed slope. A foot pressure measurement system was used to measure the skiing time and vGRF under the three plantar regions (forefoot, midfoot, rearfoot). Results: Skiing time decreased significantly in all three phases during the short turn (p<.05). In the initiation phase, the vGRF showed a greater decrease on the midfoot and rearfoot during the short turn (p<.05). In the steering phase 1, the vGRF showed a greater increase on the forefoot and decreased on the midfoot during the short turn (p<.05). In the steering phase 2, the vGRF showed a greater increase on the forefoot and rearfoot during the short turn (p<.05). Conclusion: Our findings proved that the skiing time and vGRF changed during the short turn. Consequently, we suggest that recreational skiers should decrease the skiing time of the steering phase compared to that of the initiation phase and increase the vGRF on the forefoot and rearfoot in the steering phase.

• 디지털융복합연구
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• 제15권11호
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• pp.557-565
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• 2017

이 연구는 생활체육참여자들이 인지하는 지도자의 매력성이 지도효율성 및 운동지속수행에 미치는 영향을 규명하기 하는데 목적이 있다. 이와 같이 이 연구에서 설정한 연구목적을 달성하기 위해 서울 및 경기도에서 생활체육활동에 참가하고 있는 회원 228명을 연구대상으로 하여 설문조사를 수행하였다. 수집된 자료는 SPSS 18.0 버전을 이용하여 기술통계분석, 탐색적 요인분석, 신뢰도분석, 상관분석, 그리고 회귀분석을 실시하여 검증하였다. 이러한 일련의 연구방법을 통해 얻어진 결과는 다음과 같다. 첫째, 생활체육 참여자들이 인지하는 지도자의 매력성은 지도효율성에 영향을 미친다. 둘째, 생활체육참여자들이 인지하는 지도자의 매력성은 참여자들의 운동지속수행에 영향을 미친다. 셋째, 생활체육참여자들의 지도효율성은 운동지속수행에 영향을 미친다.

• 한국운동역학회지
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• 제29권4호
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• pp.219-226
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• 2019

Objective: The purpose of this study is to provide a better understanding of short turn mechanism by describing short turns after kinematic analysis and provide skiers and winter sports instructors with data through which they are able to analyze right postures for turns in skiing in a systematic, rational and scientific manner. Method: For this, a mean difference of kinematic variables (ski-hip angle, ski-shoulder twist angle, pole checking angle, the center of gravity (CG) displacement, trunk forward lean angle) was verified against a total of 12 skiers (skilled and unskilled, 6 persons each), regarding motions from the up-start to down-end points for short turns. Results: There was no difference in a ski-hip twist angle. The ski-shoulder twist angle was large at the up-start point while a pole-checking angle was high at the down-end point in skilled skiers. Concerning the horizontal displacement of CG, skilled skiers were positioned on the right side at the upstart point. No significant difference was observed in the trunk forward lean angle. Conclusion: According to the ski-shoulder twist angle and CG horizontal displacement results, the upper body should be kept leant toward the pole. In addition, big turns should be made via edging and angulation. During pole checking, the hand holding the pole should be thrown and released toward a vector direction of the forearm.

• 한국엔터테인먼트산업학회논문지
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• 제14권3호
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• pp.93-103
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• 2020

본 연구는 노인대상 한국무용 지도자들의 애로요인을 탐색하는 것에 목적을 두고, 발견된 애로요인을 지도자 교육에 적용 가능한 PBL 문제개발로 확장하였다. 이에 크게 4가지 질문으로 구성된 개방형 설문지와 1:1 인터뷰를 통해 연구의 자료를 수집하였다. 연구결과 수강생 관리 관련, 교육과정 관련, 공연 수행 관련, 수업 환경 관련의 4가지 애로요인에서 총 9개의 하위요인이 도출되었다. 첫째, 수강생 관리 관련 애로요인으로는 '수강생들 간 갈등'과 '개인 맞춤식 수업 요구'가 탐색되었다. 둘째, 교육과정 관련 애로요인으로는 '새로운 교수법에 대한 거부감', '습득력에 따른 수준차이'가 탐색되었다. 셋째, 공연 수행 관련 애로요인으로는 '부족한 연습시간', '공연 성취 욕구', '수행기관의 행정'이 탐색되었다. 넷째, 수업 환경 관련 애로요인으로는 '제반 환경', '공간 환경'이 탐색되었다. 그리고 탐색된 노인무용 지도자들의 애로요인을 바탕으로 화합을 위한 공동체 춤, 공동안무 방식의 창작춤, 역할분배가 가능한 놀이춤, 미러링(mirroring) 기법의 춤으로 4개의 PBL 문제를 개발하였다.

• 한국운동역학회지
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• 제20권2호
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• pp.139-148
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• 2010

The purpose of this study was to comparatively analyze the kinematic variables between the squash backhand and racquetball backhand strokes through three-dimensional cinematography. Three expert racquetball players and three expert squash players were involved in the data gathering process. The horizontal, vertical and lateral displacement of racket and trunk segment, intersegmental angular velocity of the wrist, elbow and shoulder joints, and the linear velocity of the racket were descriptively analyzed, and the followings were concluded. The racket of the squash backhand stroke showed an 'U' shaped movement where the racket moved rapidly downward and moved forward to make an impact and followed through to a front-top finish, while the racket of racquetball backhand stroke showed an 'O' shaped movement where the racket showed circular movement through the rear and bottom positions for the impact, and showed rotation through the lower-front and upper front to a upper-rear-ward finish during the follow-through. The peak velocity of racket was found before the impact point in the squash backhand stroke and at the impact point in the racquetball backhand stroke. For the final conclusion, for the squash backhand stoke, instructors might be better to make the racket move downward to make highest velocity before the impact and finished short follow-through, while for the racquetball backhand stroke, to make the racket move forward to make highest velocity at the impact and finished rather long follow-through.

• 한국체육학회지인문사회과학편
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• 제55권6호
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• pp.551-560
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• 2016

이 연구는 스쿠버다이빙에 참여한 다이버들이 버디를 선택하는데 나타나는 결정과정을 지도자가 지각하는 측면에서 심층적으로 구명하는데 그 목적이 있다. 이를 위하여 연구참여자는 스쿠버다이빙 지도경력 5년 이상이며, 스쿠버다이빙클럽에서 지도자로 활동하고 있는 총 6명을 연구참여자로 선정하였다. 이와 같이 분석된 연구의 결과는 다음과 같다. 첫째, 버디를 선택하는데 있어서 교육을 통한 버디의 중요성 인식과 위험지각의 극복을 위한 동반자 인식을 통하여 버디선택의 필요성을 인식하고 있었다. 둘째, 버디를 선택하는데 있어서 레벨에 따른 기준 확립, 레스큐 다이버의 취득여부, 새로운 가치관을 통한 기준 확립을 통하여 버디선택의 기준을 확립하고 있었다. 셋째, 버디를 선택하는데 있어서 버디간의 상호작용, 버디와의 상호신뢰, 버디의 역할에 대한 자각을 통하여 버디선택의 결정요인으로 작용하고 있었다. 이상에서 알 수 있듯이, 스쿠버다이빙은 짝 다이빙을 하기 위해서 버디를 선정하여야 하며, 버디를 선정하는데 있어서 가장 중요한 요소는 상호간의 소통, 신뢰, 믿음 등과 같은 관계형성을 바탕으로 나타난다. 즉 버디와의 상호관계를 바탕으로 버디의 역할을 충분히 수행할 때 지속적인 버디로서의 관계형성이 이루어진다.

• 한국운동역학회지
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• 제25권1호
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• pp.49-56
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• 2015

Objectives : The purpose of this study was to present quantitative data and basic references to decrease the accident risk of soccer instructors. Methods : To obtain data, we conducted an investigation on how H/Q ratio affects the dynamic stability of the lower extremity at the time of drop landing. The study targeted 13 soccer players from C University who have not had any injuries or wounds in the lower extremity joints and in any other parts of their bodies over the last 6 months. By using CMIS (USA), the players were divided into two groups according to H/Q ratios higher and lower than 69%, respectively. The subjects in each group were instructed to perform a drop landing. Results : The H/Q ratio did not affect the maximal flexion angle of the knee joints at the time of drop landing. In addition the dominant group with a relatively high H/Q ratio was observed to have increased time to reduce shock and to efficiently absorb the ground reaction force during drop landing. Also, the dominant group with a relatively high H/Q ratio utilized the strong performances of the antagonistic muscles around the hamstrings and the controlled rotatory powers of the thighs that were applied to the tibias supported by the ground. Finally, H/Q ratio, load factors, and mean and maximum EMG were significantly negatively related, whereas GRFx showed a positive relationship. In fact, these factors all affected the impact of the load from the H/Q ratio to the knee joints. Conclusion : From these findings it can be concluded that unbalanced H/Q ratio can be considered as a predictor of knee joint injury at the time of drop landing.

• 한국운동역학회지
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• 제19권1호
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• pp.127-138
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• 2009

근간 요가열풍이 불면서 일반인들은 자신의 질환이나 신체 상태를 고려하지 않고 무리한 동작을 수행하여 심각한 부작용들을 초래한다. 따라서 본 연구는 빈야사 요가의 수르야 나마스카 동작들을 수행하는 동안 나타나는 요가의 숙련도에 따른 ROM (Range Of Motion)과 %MVIC (Maximum Voluntary Isometric Contraction)를 비교 분석함으로서 관절의 유연성 및 근활성도를 규명하여 올바른 동작에 대한 이해와 함께 수련자들의 상해를 예방하기 위한 기초자료를 제공하는데 목적이 있다. 특히 두 집단 간의 ROM과 %MWC는 요가동작에 따라서 현저한 차이가 나타났으며 이러한 차이가 나타나는 의자자세, 막대자세 및 전사자세는 정확한 지도가 필요한 동작들이다. 향후, 동작마다 숙련자와 비숙련자가 활성화되는 근육이 다르기 때문에 비숙련자에게 근육의 과용과 오용, 그리고 유연성 등의 문제로 인한 상해를 줄이기 위해 수련자에게 맞는 수준으로 수련을 할 수 있도록 지도해야 한다.