• Title/Summary/Keyword: Pole flexion angle

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Kinematic Analyses of Men's Pole Vault in IAAF World Championships, Daegu 2011 (2011 대구 세계육상선수권대회 남자 장대높이뛰기경기 기술의 운동학적 분석)

  • Choi, Kyoo-Jeong;Yi, Kyung-Ok;Kim, Nam-Hee;Kang, Ji-Eun;Kim, Hye-Lim
    • Korean Journal of Applied Biomechanics
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    • v.21 no.5
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    • pp.551-560
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    • 2011
  • The purpose of this study was to perform the kinematic analyses of the men's pole vault skills in IAAF World Championships Daegu 2011. Subjects were the 1st through 8th place finishers in the pole vault. The kinematic analyses were divided into four phases: two dimensional run up analysis, and three dimensional analyses for the remaining plant, swing up, and extension phases. Run-up variables consisted of run up distance, number of steps, average step length, the ratio of step length to his height, average velocity at the final 6~11 m, approach position. Three variables were analyzed during plant: pole angle, center of gravity (COG) velocity, and takeoff angle of COG. Swing up phase variables included: pole flexion angle, COG velocity (horizontal, vertical, resultant), COG trajectory and bar approach angle of COG. Compared to the 2009 World Championships in Berlin, the average vault height, run up velocity and approach position increased. However, horizontal velocity during the last two steps of the final approach decreased dramatically compared to speeds from 1990. These results reflect the change in both technique and improved physical fitness in pole vaulters. During extension, the peak height of COG averaged 0.3m higher then COG height when the pole was released. These specific results can help coaches and athletes modify training and improve performance.

The Kinematic Analysis about Double Poling Technique of National Cross-Country Skiers at Start & Finish Phases (국가대표 크로스컨트리 스키 선수들의 Start & Finish 구간에 대한 Double poling 기술의 운동학적 분석)

  • Choi, Seul-Bi;Ryu, Jae-Kyun
    • Korean Journal of Applied Biomechanics
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    • v.22 no.1
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    • pp.95-104
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    • 2012
  • The purpose of this study targeted to national cross-country skiers representatives was to implement hypothetical experiment on their patterns of the movements and analysis on kinematic variables occurred while double polling was conducted between starting and finishing phase of 56 meters. Furthermore, it aimed to provide a set of quantitative data to illustrate how to improve one's skill and performance of sprint. In our experiments, we conducted 3-dimension analysis of cycle characteristics, joint angle(hip, knee and elbow), and pole angle. The results showed that at the starting phase, the players did not show a significant difference in attributes of time and distance. In heat 1 where elbow angle and polling starts, the pole angle was noticeably high in heat 1. At the finishing phase, there was a considerable distinction with a high frequency in performing a short polling time and high speed in heat 3. The players showed large extension between the flexion and of the hip angle which indicates high contribution given from the movement of lower body(hip, knee).

Comparative Analyses on Kinematic Variables of Women's Pole Vault Competition at IAAF World Championships Daegu 2011 (2011 대구 세계육상선수권대회 여자 장대높이뛰기 경기 참가선수 경기기술의 운동학적 요인 비교분석)

  • Choi, Kyoo-Jeong;Yi, Kyung-Ok;Kim, Nam-Hee;Kang, Ji-Eun;Kim, Hye-Lim;Moon, Je-Heon;Jung, Bum-Chul
    • Korean Journal of Applied Biomechanics
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    • v.23 no.3
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    • pp.189-200
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    • 2013
  • The purpose of this study was to compare the kinematic analyses of the women's pole vault skills difference between skilled group (1st to 8th place) and less skilled group (10th to 15th place) who participated in IAAF World Championships Daegu 2011. To achieve this goal, 16 women's pole vault player's kinematic analyses was conducted. Player's best performance was recorded by five normal video cameras operating at 60 Hz. The results of this study through the research procedures above are as follows. First, Skilled group's average step length and the ratio of step length to her height were longer than less skilled's group in run-up phase. Second, Skilled group's horizontal velocity was faster than less Skilled group's results. And pole plant angle was lower than less Skilled group's results in take-off phase. Third, Maximum pole flexion angle did not show difference of between two groups in pole bending phase. However, Skilled group's vertical velocity was higher than less skilled group's results.