• Title/Summary/Keyword: Soccer

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On wave propagation of football ball in the free kick and the factors affecting it

  • Xumao Cheng;Ying Wu
    • Steel and Composite Structures
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    • v.46 no.5
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    • pp.669-672
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    • 2023
  • In this research, the researcher has examined the factors affecting the movement of the soccer ball and will show that the effects such as air resistance, altitude above sea level, wind, air pressure, air temperature, air humidity, rotation of the earth, changes in the earth's gravitational acceleration in different areas. It, the geographical length and latitude of the launch point, the change of gravitational acceleration with height, the change of pressure with height, the change of temperature with height and also the initial spin (Magnus effect) affect the movement of projectiles (especially soccer ball). We modelled th ball based on shell element and derive the motion equations by energy method. Finally, using numerical solution, the wave of the ball is studied. The influences of various parameters are investigated on wave propagation of the ball. Therefore, in short, it can be said that the main factors that play a major role in the lateral deviation of the hit ball are the initial spin of the ball and the wind.

Effects of Y-Balance Test Difference of the Ankle Dorsiflexion Range of Motion in K3 Soccer Players (K3 축구선수의 발목 발등굽힘 관절가동범위 차이가 Y-Balance Test에 미치는 영향)

  • Gyu-Ho Choi;Jin-Wook Lee
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2023.07a
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    • pp.301-304
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    • 2023
  • 이 연구의 목적은 발목관절의 발등굽힘 가동범위에 따라 동적 균형능력을 평가하는 Y-Balance Test와의 관계를 규명하고자 하였다. 이 연구 결과 HADR군에서 PLRD(P<.05)와 CS(P<.01)에서 유의한 차이가 나타났으며, 발목관절 발등 굽힘의 가동범위와 뒤안쪽 도달거리(PMRD), 뒤가쪽 도달거리(PLRD) 및 종합점수(CS)만 중등도의 유의한 상관관계가 나타났다. 따라서 발목관절 발등굽힘의 감소는 균형능력 능력을 감소와 관련이 있으며 축구선수의 손상의 예방하기 위해서는 정기적인 발목 관절가동범위를 평가가 필요한 것으로 생각된다.

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Iliacus Muscle Rupture with Associated Partial Femoral Nerve Palsy during Soccer Game - Case Report - (축구 경기 중 발생한 장골근 파열과 부분 대퇴 신경 마비 - 증례보고 -)

  • Jung, Sung-Hoon;Lee, Sang-Ho;Song, Kyeong-Seop;Park, Byeong-Mun;Ki, Chul Hyun
    • Journal of Korean Orthopaedic Sports Medicine
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    • v.11 no.2
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    • pp.92-95
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    • 2012
  • Iliacus muscle tears are a rare injury seen after the high-energy trauma or as a result of low-energy injuries in patients with a bleeding diathesis as coagulopathy, receiving anticoagulation therapy and hemophiliac. Femoral nerve palsy due to compression from a hematoma by iliacus muscle rupture are rarely reported. Routine evaluation includes MRI to confirm and define the pathologic abnormality supplemented by EMG and nerve conduction studies to evaluate patterns and extent of femoral nerve injury. Hematologic evaluation for bleeding diathesis may preceded, if suspicion of coagulopathy is present. We report the case of a healthy 32-year-old male with iliacus rupture and concomitant femoral nerve palsy sustained by kicking motion during soccer game. After 6 months of observation with non-operative treatment regimen, satisfactory results were obtained, so we report it with a review of the literatures.

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UBA-Sot : An Approach to Control and Team Strategy in Robot Soccer

  • Santos, Juan-Miguel;Scolnik, Hugo-Daniel;Ignacio Laplagne;Sergio Daicz;Flavio Scarpettini;Hector Fassi;Claudia Castelo
    • International Journal of Control, Automation, and Systems
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    • v.1 no.1
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    • pp.149-155
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    • 2003
  • In this study, we introduce the main ideas on the control and strategy used by the robot soccer team of the Universidad de Buenos hires, UBA-Sot. The basis of our approach is to obtain a cooperative behavior, which emerges from homogeneous sets of individual behaviors. Except for the goalkeeper, the behavior set of each robot contains a small number of individual behaviors. Basically, the individual behaviors have the same core: to move from the initial to-ward the target coordinates. However, these individual behaviors differ because each one has a different precondition associated with it. Each precondition is the combination of a number of elementary ones. The aim of our approach is to answer the following questions: How can the robot compute the preconditions in time\ulcorner How are the control actions defined, which allow the robot to move from the initial toward the final coordinates\ulcorner The way we cope with these issues is, on the one hand, to use ball and robot predictors and, on the other hand, to use very fast planning. Our proposal is to use planning in such a way that the behavior obtained is closer to a reactive than a deliberative one. Simulations and experiments on real robots, based on this approach, have so far given encouraging results.

Analysis of the Movement and Anatomical Angular Motion of the Joints of the Lower Extremities in Soccer Instep Kick (축구 인스텝 킥의 하지관절 움직임과 해부학적 각운동 분석)

  • Kang, Sang-Hack;Son, Won-Il
    • Korean Journal of Applied Biomechanics
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    • v.18 no.1
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    • pp.1-10
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    • 2008
  • This study analyzed the rear foot angle of the supporting leg and the anatomical rotation angle of the kicking angle in soccer instep kick and drew conclusions as follows. When the supporting leg was landing on the ground, the valgus angle of the ankle joint reached the maximum peak, and plantar flexion was slightly different in the timing of the maximum peak between the two groups. The flexion angle of the rear foot was statistically significantly different between the two groups, and the movement of the crus on the landing of the supporting foot did not show a statistically significant difference between the groups. The crus leaned backward most before the impact, and the side to side gradient of the crus on impact was $22^{\circ}$. The flexion/extension of the hip joint of the kicking leg reached the maximum peak when the supporting foot was landing on the ground, and at the moment, the maximum extension angle of the hip joint was over $30^{\circ}$. The flexion angle of the knee joint of the kicking leg was largest after landing. While the maximum plantar flexion angle and maximum valgus angle of the ankle joint were not significantly different between the two groups, the maximum external rotation angle was significantly different.

Effect of Kyungohkgo on Aerobic Capacity and Anti-fatigue in High School Soccer Players (경옥고 섭취가 고등학교 축구선수의 운동수행능력 향상 및 피로 회복에 미치는 영향)

  • Kim, Dong-Gun;Park, Won-Hyung;Cha, Yun-Yeop
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.25 no.5
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    • pp.934-944
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    • 2011
  • This study was designed to investigate the effects of Kyungohkgo to improve aerobic capacity and eliminate exercise-induced fatigue in high school soccer players. Twenty four subjects were participated and randomly assigned into two groups [KG, Kyungohkgo group (n=12); PG, Placebo control group (n=12)]. Two groups were completed treadmill exercise protocol using graded exercise test at before and after experimental treatment of 4 weeks. The $VO_2$max and endurance time were measured by gas analysis and heart rate (HR) was measured by polar system at pre, post 0, post 5, post 15, post 30 and post 60 minutes. Blood samples were collected to analyze blood components. 1. The $VO_2$max was significant increased in the group of after intake Kyungohkgo compared to the group of after intake placebo (p<.05). 2. The HR was significant decreased in the group of after intake Kyungohkgo compared to the group of after intake placebo during recovery time at post 5 mins(p<.05), 30 mins(p<.01), 60 mins(p<.01). 3. Weight, body mass index, percent body fat, anaerobic threshold, endurance time, blood lactate concentrate, lactate dyhydrogenase, creatine kinase, serum glutamic oxaloacetic transaminase, serum glutamic pyruvic transaminase, other energy sources(total-cholesterol, triglyceride, high density lipoprotein-cholesterol, low density lipoprotein-cholesterol, creatinine) and electrolyte (Na, K, Cl) were shown no significant differences between groups. These results suggested that Kyungohkgo can be used as ergogenic aids to improve aerobic capacity and eliminate exercise-induced fatigue.

The Effect of Progressive Lumbar Stability Exercise on the Transversus Abdominis Muscle Thickness and Lower extremity muscle Fatigue Index in Soccer Players (축구선수의 진행형 요부안정화운동이 복횡근 두께와 하지근육 피로지수에 미치는 영향)

  • Lee, Joon-Hee;Park, Seung-Kyu;Kang, Jeong-Il;Yang, Dae-Jung;Kim, Je-Ho;Jeong, Yong-Sik
    • Korean Journal of Applied Biomechanics
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    • v.22 no.3
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    • pp.349-356
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    • 2012
  • This study aimed to assess the effects of progressive lumbar stability exercises and lumbar stability exercises on changes in the transversus abdominis muscle thickness and lower extremity muscle fatigue index in soccer players. Ten subjects were assigned to undergo training in each of the 2 groups, namely, the progressive lumbar stability exercise group and lumbar stability exercise group. Each intervention session lasted for 30 min, and 4 sessions were conducted in a week for 6 weeks for soccer players of S. University in Jeonnam, Korea. Changes in the transversus abdominis muscle thickness and lower extremity muscle fatigue index were measured using ultrasound and surface electromyogram. The results of the ultrasound measurement for the transversus abdominis muscle thickness indicated that progressive lumbar stability exercises were more effective than lumbar stability exercises. The results of the lower extremity muscle fatigue index measurements using surface electromyogram indicated that the fatigue index decreased in the progressive lumbar stability exercise group. Progressive lumbar stability exercise is believed to have put more workload during the shaking of the limbs, leading to increased stability and increased efficiency of the lower extremity muscle, thereby decreasing the fatigue index. Therefore, progressive lumbar stability exercises can be an effective measure for preventing injuries and improving the game performance of sports players by increasing the transversus abdominis muscle thickness and decreasing the lower extremity muscle fatigue index.