• 한국운동역학회지
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• 제23권3호
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• pp.201-208
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• 2013

The aim of this study was to investigate badminton smash and drop motion depends on player's level. To perform this study, ten male badminton players were participated: five skilled players (SG, age: $21.6{\pm}1.1$ yrs, height: $181.4{\pm}6.8$ cm, body mass: $72.4{\pm}5.7$ kg, career: $11.2{\pm}1.1$ yrs) and five less-skilled players (LSG, age: $21.2{\pm}1.1$ yrs, height: $180.2{\pm}5.6$ cm, body mass: $73.6{\pm}6.7$ kg, career: $10.6{\pm}0.9$ yrs). Three-dimensional motion analysis with 7 infrared cameras was performed with a sampling frequency as 200 Hz. Player's swing motion was divided into four events: starting motion (E1), backswing (E2), impact (E3), following (E4). For all upper joints, LSG showed greater angle differences between drop and smash motions than that of SG at E3 (p<.05). For all upper joints, greater angular velocities were found in SG than that of LSG. For both groups, significantly smaller angular velocities were found in drop motion than that of smash motion (p<.05). The greater sequential angular velocities (proximal to distal) were found in SG than LSG during smash motion. Based on our findings, performing the same motion between drop and smash would be related to enhance performance at badminton competition. It is expected that these results will be useful in developing a training program for enhancing performance of badminton athletes.

• 한국운동역학회지
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• 제23권2호
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• pp.99-108
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• 2013

The purpose of this study was to analyze the kinematic characteristics of javelin to compare the characteristics between world elite athletes and local male athletes. The subjects selected 9 athletes out of total 13 athletes recorded more than 65 m in the preliminary and main competition participated in the 93rd National Sports Festival held in 2012. Three-Dimensional motion analysis using a system of 4 video cameras(Sony HXR-MC2000) at a sampling frequency of 60 fields/s was performed for this study. The Kwon3D 3.1 was used to obtain the three dimensional coordinates about the top, grip, end of javelin. And the kinematic factors of javelin calculated using Matlab2009a program. The resultant speed of javelin that affects directly to the record of performance showed 26.08 m/s indicated lower speed of about 2-3 m/s than world elite athletes. The release point appeared to have been made at the high of $1.79{\pm}0.07$ m of 99.8% of the height of the athletes. In terms of release angle, it was indicated average $33.0{\pm}3.81^{\circ}$ lower release angle compared to the world elite athletes. The attitude angle(up & down tilt angle, X axis) related to javelin indicated average $38.5{\pm}4.96^{\circ}$, its related attack angle average $5.5{\pm}5.11^{\circ}$, and yaw angle(sideslip, side attack angle) average $15.7{\pm}8.48^{\circ}$.

• 디지털융복합연구
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• 제17권10호
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• pp.469-478
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• 2019

본 연구는 스포츠산업 분야의 민간스포츠 분야에 문제를 해결하고 발전을 위한 대안으로 스포츠협동조합이 정착하고 발전할 수 있도록 활성화 요인을 분석하였다. 협동조합과 스포츠협동조합 전문가를 대상으로 델파이 조사를 통해 활성화 요인 도출과 AHP를 통해 그 우선순위를 분석한 결과, 다음과 같은 결론을 제시하였다. 먼저, 기본방향으로 경제적 사회적 문화적 제도적 요인을 제시하였다. 다음 추진전략은 첫째, 협동조합의 본질에 기초한 방향 설정, 둘째, 사업 경영 개발과 조직 역량 강화로 재정확보, 셋째, 협동조합 기본법 숙지와 행정지원 확보, 넷째, 협동조합 간 협력과 상호작용을 통한 지역사회기여 등의 순으로 제시하였다. 끝으로 실천과제는 첫째, 조합원 필요성과 가치철학 인식으로 소통 및 공유, 둘째, 전문경영 교육을 통한 자질향상으로 재정자립도 강화, 셋째, 민주적인 운영과 촉진정책으로 조합원 경제적 참여, 넷째, 정부 정책 및 행정업무 숙지를 통한 지원확보, 다섯째, 협동조합 간 네트워크구축으로 지역 커뮤니티형성, 여섯째, 조합원 체계구축과 효율성 추구로 사업모델개발 순으로 제시하였다.

• 한국운동역학회지
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• 제29권3호
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• pp.145-155
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• 2019

Objective: The purpose of this study was to compare the physical characteristics (bone mineral density, joint muscle strength) and running biomechanics between older adults and young adult runners to understand the changes of running strategy by aging. Method: Bone mineral density (Dual Energy X-ray Absorptiometry, USA) of lower lower extremity and muscle strength (Cybex Humac Norm [DEXA], CSMI, USA) were measured to identify the physical characteristics of 10 elderly (age: $67.70{\pm}3.30yrs$, height: $1.68{\pm}0.04m$, mass: $67.70{\pm}3.80kg$) and 10 young adults (age: $21.20{\pm}0.42yrs$, height: $1.73{\pm}0.06m$, mass: $72.11{\pm}4.15kg$). Running data was collected by using an instrumented treadmill (Bertec, USA) and 7 infrared cameras (Oqus 300, Qualisys, Sweden). Two-way repeated ANOVA analysis was used to analyze results at a significant level of .05 with Bonferroni post hoc analysis. Results: Compared to the young adult group, the elderly group showed statistically significant difference in physical characteristics and in running characteristics. Elderly runners showed lower BMD and muscle strength compared with young runners (p<.05). In the running parameters, elderly runners tend to show shorter contact time and stride length compared with young runners (p<.05). In the joint angles, elderly runners showed smaller range of ankle motion compared with young runners (p<.05). Finally, elderly runners showed lower level of joint moment, joint power, and GRF compared with young runners in each running speed (p<.05). Conclusion: The running behavior of the elderly performed periodic running was similar to many variables of young adults. However, there were noticeable differences found in the ankle joints and most kinetic variables compared with young adult runners. This discrepancy may propose that elderly runners should consider appropriate running distance and intensity in the program.

• 한국운동역학회지
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• 제29권2호
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• pp.53-60
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• 2019

Objective: The purpose of this study was to investigate the differences of smoothness and coordination of the fingers and upper extremities between skilled and non-skilled players during receiving the basketball. Method: Ten male recreational basketball players (age: $23.2{\pm}2.7yrs.$, career: $8.6{\pm}1.6yrs.$, height: $177.3{\pm}6.0$, weight: $72.9{\pm}8.5kg$) careering over five years and ten non-skilled males (age: $27.3{\pm}1.5yrs.$, height: $173.7{\pm}5.6$, weight: $73.2{\pm}12.6kg$) were participated in this study. Then, participants were asked to perform basketball receiving movement for ten times. The receiving movements were recorded by eight infrared cameras (Oqus 300, Qualisys, Sweden). The collected rad data were calculated to duration of basketball receiving, Jerk-Cost, CRP and CRP variability. Results: The CRP of MCP-Wr, Wr-El in skilled group were greater than non-skilled group (p<.05). The CRP variability of El-Sh in non-skilled group was greater than skilled group (p<.05). Conclusion: These results suggest that skilled players perform more effective movement for impact absorption from the basketball. Moreover, the skilled players have consistent movement patterns during basketball performance. Lastly, it is important to train finger sensation and cognitive ability of thrown basketball from the passer.

• 한국응용과학기술학회지
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• 제40권6호
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• pp.1340-1349
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• 2023

Despite its profound impact on athletic performance, the significance of heart rate recovery (HRR) has been insufficiently addressed in the filed of sports science, particularly in the context of weightlifting characterized by brief and intense exertions involving heavy weights. Serving as a valuable indicator of autonomic nervous system and cardiovascular function, HRR assumes a pivotal role in weightlifting. This comprehensive review aims to delineate the specific demands for HRR in weightlifting, shedding light on the often overlooked cardiovascular considerations within training regimes focused on strength and power. The investigation scrutinizes the repercussions of HRR on weightlifting performance, seeking to elucidate how inadequate recovery intervals may result in physiological and psychological consequences. These consequences encompass a distorted perception of effort, disruption of coordination, compromised posture due to irregular breathing, and an overall decline in lifting capacity. The review systematically presents compelling evidence pertaining to heart rate response and recovery patterns during weightlifting, underscoring the critical importance of well-structured rest periods. Furthermore, the review delves into a comprehensive discussion of factors influencing HRR in weightlifting, encompassing variables such as sex, age, cardiovascular function, hydration, nutrition, and psychological aspects. Finally, a key emphasis is placed on the integration of effective HRR techniques into the training regimens of weightlifters, thereby ensuring sustained and optimized performance outcomes.

• 한국운동역학회지
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• 제14권1호
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• pp.183-187
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• 2004

• 한국운동역학회지
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• 제14권1호
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• pp.189-192
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• 2004

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2008년도 Asian Magnetics Conference
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• pp.180.2-180.2
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• 2008

• 한국항해항만학회지
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• 제37권1호
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• pp.91-100
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• 2013

본 연구의 목적은 해양스포츠이벤트 유형별 지속가능성을 과학적으로 분석하여 경제, 사회 그리고 환경적으로 지속가능한 해양스포츠이벤트 개발 전략을 제시하기 위해 실시되었다. 이러한 연구목적을 달성하기 위해 해양스포츠이벤트 방문객 285명을 대상으로 설문조사를 실시하였다. 조사도구는 Oh(2003), Park(2009) 그리고 Song and Lee(2005)등의 선행연구를 토대로 본 연구의 상황에 맞게 요인 및 항목을 수정 보완하였으며 전문가에 의한 내용타당도 검증을 통해 조사도구의 타당성을 검증하였다. 일원변량분석(ANOVA)와 사후검증(Scheffe)을 통해 이벤트 유형별 지속가능성을 분석하였으며 다음과 같은 결론을 도출하였다. 첫째, 해양스포츠이벤트의 긍정적 지속가능성은 해양공간정비(M=3.82)가 가장 높았으며 고용창출(M=3.46)이 가장 낮게 나타났다. 반면 부정적 지속가능성은 교통정체(M=3.16)가 가장 높게 나타났으며 참가자와 주민 갈등(M=2.73) 항목이 가장 낮게 나타났다. 둘째, 해양스포츠이벤트 유형별 긍정적 지속가능성은 축제형 해양스포츠이벤트가 경제적(M=3.79), 사회적(M=3.84) 그리고 환경적(M=3.80) 지속가능성 요인 모두에서 긍정적 효과가 통계적으로 유의하게 높은 것으로 나타났다. 셋째, 해양스포츠이벤트 유형별 부정적 지속가능성은 통계적 유의도는 나타나지 않았으나 비지니스형이 경제적(M=3.22), 사회적(M=3.26) 그리고 환경적(M=3.25) 지속가능성 요인 모두에서 부정적 효과가 타 해양스포츠이벤트에 비해 상대적으로 큰 것으로 나타났다. 결론적으로 본 연구의 결과는 경제, 사회 및 환경적으로 지속가능성을 확보할 수 있는 해양스포츠이벤트 유형을 제시해 주고 있으며 해양스포츠이벤트의 지속가능한 개발 전략을 수립하는데 기초 자료를 제공하고 있다.