• 제목/요약/키워드: contact sports

검색결과 73건 처리시간 0.032초

보행 시 변형 및 복원이 가능한 인솔에 대한 족저압력 비교 분석 (Comparative Analysis of Foot Pressure Distribution by Functional Insole to be Transformed and Restored During Walking)

  • 박승범;이경득;김대웅;유중현;김경훈
    • 한국운동역학회지
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    • 제21권2호
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    • pp.231-241
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    • 2011
  • The purpose of this study was to analyze the distribution of foot pressure generated by active materials of a functional insole. Comfort is an important consideration while selectingfootwear and insoles. Consequently, it has an influence on injury. The development of new materials for functional insoles is considered one of the more important points for their manufacture. The method adopted in this study is as follows. First, ten healthy males were selected as subjects for the study. Each subject's foof was pre-screened podoscope(Alfoots, Korea) to check for the presence of any foot abnormalities, Two kinds of equipment were used for the study: a foot pressure device from Pedar-X, Germany, and a treadmill from Pulsefitness, UK. Next, each subject was asked to test four types of insoles(insoles of outdoor shoes, indoor shoes, walking shoes, and sports shoes) via walking trials on the treadmill at a constant speed of 4.2 km/h. The pressure distribution data(contact area, maximum force, maximum peak pressure, and maximum mean pressure) was collected using the pressure device at a sampling rate of 100 Hz. Results of the tests showed that all four types of functional insoles increased contact areas whit the foot. Further, functional insoles of walking shoes and sport shoes decreased the foot pressure. From these results, we conclude that the active materials of functional insoles of shoes can increase the contact area and provide greater comfort.

여자필드하키선수의 Global Positioning System 변인에 따른 비접촉성 하지부상 발생위험도 (Non-Contact Injury Risk in Lower Extremity depending on Global Positioning System Variables among Female Field Hockey Players)

  • 최호경;김은국;박종철;김태규
    • 한국융합학회논문지
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    • 제10권9호
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    • pp.273-281
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    • 2019
  • 본 연구는 여자 필드하키 선수를 대상으로 GPS를 활용하여 훈련 또는 시합 동안 발생하는 움직임을 정량화하고 비접촉성 하지부상과 관련된 변인에 대해 부상 발생위험도를 확인하고자 하였다. 골키퍼를 제외한 52명의 국가대표 선수를 대상으로 훈련 또는 시합 동안 발생하는 움직임을 GPS를 통해 측정한 후 각 변인에 대해 1주간과 4주간 평균을 산출하였고, 비접촉성으로 발생하는 하지부상 경험과 관련된 GPS변인에 대해 움직임 강도의 범위에 따른 하지부상 발생위험도를 산출하였다. 그 결과, 공격수는 1주간 총 뛴 거리와 높은 속도로 뛴 횟수의 약간 낮은 범위 및 높은 속도로 뛴 거리에서는 높은 범위의 부상 발생위험도가 가장 낮게 나타났고, 4주간의 높은 속도로 뛴 거리에서는 움직임의 강도가 증가함에 따라 위험도가 감소하였다. 미드필더는 1주간 총 뛴 거리와 높은 속도로 뛴 거리, 높은 속도로 뛴 횟수 및 감속 횟수의 낮은 범위에서 위험도가 가장 낮게 나타났고, 수비수는 하지부상 유무에 따른 움직임의 차이를 보이지 않았다.

New insights about ice friction obtained from crushing-friction tests on smooth and high-roughness surfaces

  • Gagnon, Robert E.
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제10권3호
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    • pp.361-366
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    • 2018
  • Ice crushing occurs in many situations that involve a sliding frictional component such as sports involving ice-contact, ice interaction with ship hulls, and ice-on-ice sliding/crushing within glaciers and between interacting sea ice floes. Ice crushing-friction tests were conducted in the lab at $-10^{\circ}C$ using a set of acrylic ice-crushing platens that included a flat smooth surface and a variety of high-roughness surfaces with regular arrays of small prominences. The experiments were part of Phase II tests of the Blade Runners technology for reducing ice-induced vibration. Ice was crushed against the platens where the ice movement had both a vertical and a horizontal component. High-speed imaging through the platens was used to observe the ice contact zone as it evolved during the tests. Vertical crushing rates were in the range 10-30 mm/s and the horizontal sliding rates were in the range 4.14-30 mm/s. Three types of freshwater ice were used. Friction coefficients were extraordinarily low and were proportional to the ratio of the tangential sliding rate and the normal crushing rate. For the rough surfaces all of the friction coefficient variation was determined by the fluid dynamics of a slurry that flowed through channels that developed between leeward-facing facets of the prominences and the moving ice. The slurry originated from a highly-lubricating self-generating squeeze film of ice particles and melt located between the encroaching intact ice and the surfaces.

동작인식 스마트 의류제품의 특징적 유형 분석 (The analysis of the characteristic types of motion recognition smart clothing products)

  • 임효빈;고현진
    • 복식문화연구
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    • 제25권4호
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    • pp.529-542
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    • 2017
  • The purpose of this study is to utilize technology as basic data for smart clothing product research and development. This technology can recognize user's motion according to characteristics types and functions of wearable smart clothing products. In order to analyze the case of motion recognition products, we searched for previous research data and cases referred to as major keywords in leading search engines, Google and Naver. Among the searched cases, information on the characteristics and major functions of the 42 final products selected on the market are examined in detail. Motion recognition for smart clothing products is classified into four body types: head & face, body, arms & hands, and legs & feet. Smart clothing products was developed with various items, such as hats, glasses, bras, shirts, pants, bracelets, rings, socks, shoes, etc., It was divided into four functions health care type for prevention of injuries, health monitor, posture correction, sports type for heartbeat and exercise monitor, exercise coaching, posture correction, convenience for smart controller and security and entertainment type for pleasure. The function of the motion recognition smart clothing product discussed in this study will be a useful reference when designing a motion recognition smart clothing product that is blended with IT technology.

8주 동안의 육상 교양수업 참여가 단거리 스타트 동작에 미치는 영향 (The Effect of 8 Weeks Athletics Class on Sprint Start Motion)

  • 이진택
    • 한국운동역학회지
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    • 제24권3호
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    • pp.209-216
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    • 2014
  • The purpose of this study was to explore the effect of 8 weeks after school classes of track sports on students' start motion through kinematic variables. 30 students in D National university of education participated for this study. These students divided into two groups, 17 students for experimental group and 13 students for control group. The two groups participated in general athletic class as common class, and the experimental group participated in after school class additionally. The general class taught track and jump skill for 3 hours a week, and the after school class taught only athletic running skill for 30 minutes a week. Pre and post test assessed to assess students' kinematic changes. Findings indicated that velocity and step rate were increased, and contact time, step length, displacement of center of mass were decreased in the experimental group. In the control group, early velocity, knee/hip angle velocity were increased, and contact time, step length, displacement of center of mass were decreased. In conclusion, the students who only participated in general class, could not maintain athletic skills obtained from the class. However, students who participated in both general and after school class accomplish athletic start skill. This is because Continuous learning effect helped students keep the skill and did not lose the skill. Thus, in order for students to learn specific sport skills, joining after school class with general class together is recommended.

정상인과 체육인의 교합상태에 대한 정상적.정량적 비교 연구 (A QUALITATIVE AND QUANTITATIVE STUDY ON OCCLUSAL CONDITIONS IN HEALTH VOLUNTEERS AND ATHLETES WITH NORMAL OCCLUSION)

  • 장정미;이성복
    • 대한치과보철학회지
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    • 제36권2호
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    • pp.302-322
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    • 1998
  • This study was accompolished to analyze and compare the number and area of the occlusal contact points in healthy volunteers and athletes with normal occlusion. For this study, 15 athletes(13 amles and 2 females with average age 20) and 21 healthy volunteers(14 mles and 7 females with average age 20.09) were selected. The visual display acquired by scanning of occlusal record in maximal intercuspation was converted into 16 gray value image. Then, using computer program(J & Lee Occlusal Analyser), the pixel which was in definite range of the gray value was recognized, and the numbers of recognized pixel were calculated to area. The results were as follows ; 1. The average numbers of total occlusal contact feints were 31.05 in control group, and 34.67 in athlete group. The average area of total occlusal contacts was $100.25mm^2$ in control group, and $127.78mm^2$ in athlete group. 2. In control group, the average numbers of occlusal contact points were revealed in order as follows ; the first molar(8.48), the second molar(8.24), the second premolar(4.71), the lateral incisor(2.90), the first premor(2.43), the central incisor(2.19), and the canine(2.1). The least average in canine(2.1) was similar to the average(2.19) in central incisor and (2.09) in lateral incisor. In athlete group, the average numbers of occlusal contact points were revealed in order as follows ; the first molar(8.97), the second molar(8.47), the second premolar(5.60), the canine(3.80), the lateral incisor(3.33), the first premolar(2.67), and the central incisor(1.93). 3. In control group, the average areas of occlusal contact surface were revealed in order as follows ; the first molar($39.47mm^3$), the second molar($37.54mm^3$), the second premolar($9.54mm^3$) the first premolar($6.18mm^3$), canine($3.49mm^3$), the central incisor($2.76mm^3$), and the lateral incisor($1.28mm^3$). In athlete group, the average areas of occlusal contact surface were revealed in order as follows ; the first molar($44.11mm^3$), the second molar($40.69mm^3$), the second premolar($16.50mm^3$), the first premolar($9.39mm^3$), the canine($5.08mm^3$), the lateral incisor($3.7mm^3$), and the central incisor($2.25mm^3$). 4. With aging in both control and athlete group, there was a decreasing tendancy in average number of occlusal contact point, and was an increasing tendancy in average area of occlusal contact surface. In comparison at each age, both the numbers and area of occlusal contact were greater in athlete group than in control group. It was not significant in the numbers of occlusal contact points beween athlete and control group(p>0.1), but significant in the area of occlusal contact surface(p<0.03). 5. In comparision as to the kind of sports(Gymnastics : 2, Rugby : 3, Soccor : 5, Ice hocky : 5), the numbers of occlusal contact points were the most in ice hocky, and the area of occlusal contact surface was the greatest in gymnastics. With increasing a career in athlete group, there was a decreasing tendancy in average numbers of occlusal contact points and was an increasing tendancy in average area of occlusal contact surface. 6. By T-scan analyzing, the contact numbers on the anterior teeth were greater in control group than in athlete group, and on the posterior teeth were greater in athlete group than in control group. And the results acquired by T-scan were lesser than that caquired by the silicone bite records. It was not significant in the posterior teeth, but significant in the anterior teeth. In T-scan records, the numbers of occlusal contact points on second molar were the greatest, but in the silicone records, the numbers on first molar were the greatest.

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축구 손상에 의한 전방 십자인대 파열 환자의 수상 기전 (Mechanism of Injury in the Anterior Cruciate Ligament Tears Sustained in Participation in Soccer)

  • 조광현;박영은;최남홍
    • 대한정형외과스포츠의학회지
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    • 제7권1호
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    • pp.33-36
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    • 2008
  • 목적: 축구에 의해 발생한 전방 십자인대 파열 환자에서 손상의 기전을 알아보고자 하였다. 대상 및 방법: 축구 도중에 발생한 전방 십자인대 파열이 된 환자 92명 중 손상 기전을 정확히 기억하는 환자 50명을 대상으로 하였다. 평균 연령은 27세로, 남자 47명, 여자 3명 이였다. 아마추어 및 프로 축구 선수는 15명이었고, 35명은 비선수였다. 수상 기전은 전화나 의무기록으로 조사하였다. 결과: 수상 기전은 접촉성 손상이 17명, 비접촉성 손상이 33명 이었고, 41명의 환자가 손상 당시 발이 지면에 접촉을 하였고, 9명은 지면에 접촉하지 않았다. 접촉성 손상에서 17명 중 9명에서 슬관절에 외반력, 5명에서 내반력이 가해졌고, 11명의 환자가 손상 당시 발이 지면에 접촉을 하였고, 6명은 발이 지면에 접촉하지 않았다. 발이 지면에 접촉된 상태에서 대퇴부의 회전에 의한 손상은 3명이었고, 과신전 손상은 1 명이었고, 감속 손상은 없었다. 비접촉성 손상에서 33명 중 30명의 환자가 손상 당시 발이 지면에 접촉을 하였고, 3명은 발이 지면에 접촉하지 않았다. 30명 중 대퇴부의 회전에 의한 손상은 16명이 있었고, 6명에서 슬관절에 외반력, 5명에서 내반력이 가해졌고, 과신전 손상은 5 명이었고, 감속 손상은 2명 이었다. 발이 지면에 접촉하지 않은 3명의 환자들은 킥을 할 때 손상을 받았다. 결론: 축구 선수에서 전방 십자인대 파열은 대부분(66%) 비접촉성이 원인이며, 발이 지면에 접촉되면서 상체가 회전되면서 발생했다. 접촉성인 경우 대부분(53%) 외측에서의 태클에 의한 외반력이 원인이었다.

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American Football Injuries In Korea

  • Roh Kwon Jae;Kim Dong Wook
    • 대한견주관절학회:학술대회논문집
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    • 대한견주관절학회 1995년도 학술대회
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    • pp.20-20
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    • 1995
  • American football is currently played in 29 Universities in Korea, It is a contact sport where injuries are inevitable. This study was undertaken to determine the incidence and the anatomical distribution of injury based on evaluation of Yonsei University American football team. A total 74 injuries was reported among 77 players Knee, ankle and hand were vulnerable to injury. Operations were performed on $9(12.2\%)$ of the injuries. Catastrophic injuries can occur in this sport, but none has happened in Yonsei University team during the 20 years for which the sports has been practised. The frequency of injuries and their profile resemble those in US-based studies so it is suggested that the precautions and preventive measures recommended in the USA should be applied and followed in Korea.

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치과의사 맞춤형 마우스가드의 제작방법 (Understanding and Practice of Eating-Swallowing Disorder)

  • 노관태
    • 대한치과의사협회지
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    • 제56권6호
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    • pp.333-338
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    • 2018
  • The mouth guard is a device with elasticity to be installed in the oral cavity. It has a function to reduce the trauma in the oral cavity and to protect the teeth and surrounding tissues from trauma. The purpose of mouth guard is to prevent trauma and concussion. It is mandatory to wear a mouthguard in sports where there is a lot of contact and the possibility of trauma or concussion in the mouth area is high. The mouse guard is divided into a stock type, a mouth formed type, and a custom made type according to the manufacturing method. The custom made type is made on the individual dentition model and has excellent retention because of its excellent fit. Also, the effect of trauma prevention is excellent. It is possible to design and adjust by the dentist and reduce the complaint the athlete has about the mouthguard. In this article, the process of making a dentist-customized mouthguard was described.

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Statistical Parametric Mapping을 이용한 시상면에서의 양발 착지와 외발 착지의 전략 차이 (Analysis of the Differences of the Shock Attenuation Strategy between Double-leg and Single-leg Landing on Sagittal Plane using Statistical Parametric Mapping)

  • Ha, Sunghe;Park, Sang-Kyoon;Lee, Sae Yong
    • 한국운동역학회지
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    • 제29권4호
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    • pp.255-261
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    • 2019
  • Objective: The purpose of this study was to investigate differences of shock attenuation strategies between double-leg and single-leg landing on sagittal plane using statistical parametric mapping. Method: Nine healthy female professional soccer players (age: 24.0±2.5 yrs, height: 164.9±3.3 cm, weight: 55.7±6.6 kg, career: 11.2±1.4 yrs) were participated in this study. The subjects performed 10 times of double-leg and single-leg landing from the box of 30 cm height onto force plates respectively. The ground reaction force, angle, moment, angular velocity, and power of the ankle, knee, and hip joint on sagittal plane was calculated from initial contact to maximum knee flexion during landing phase. Statistical parametric mapping was used to compare the biomechanical variables of double-leg and single-leg landing of the dominant leg throughout the landing phase. Each mean difference of variables was analyzed using a paired t-test and alpha level was set to 0.05. Results: For the biomechanical variables, significantly increased vertical ground reaction force, plantarflexion moment of the ankle joint, negative ankle joint power and extension moment of the hip joint were found in single-leg landing compared to double-leg landing (p<.05). In addition, the flexion angle and angular velocity of the knee and hip joint in double-leg landing were observed significantly greater than single-leg landing, respectively (p<.05). Conclusion: These findings suggested that negative joint power and plantarflexion moment of the ankle joint can contribute to shock absorption during single-leg landing and may be the factors for preventing the musculoskeletal injuries of the lower extremity by an external force.