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Performance Analysis of Men's 110-m Hurdles using Rhythmic Units
홍성홍,류재균 한국운동역학회 2018 한국운동역학회지 Vol.28 No.2
Objective: This study aimed to create a strategic training method to enhance optimal athletic ability using information from 1H to 10H rhythmic units. Method: Top three world class athletes and three national winners of 110-m hurdle finals from the 2010 Daegu International Athletics Competition and 2017 National Athletics Championship, respectively, were selected. To analyze the kinematic variables, Dartfish 9.0 was used for two-dimensional analysis. Results: Regarding the interval time from the start to the finish line, the national athletes took less time during the pure acceleration phase (start to 1H) than the foreign athletes. The horizontal velocity increase was slower after 1H; the national athletes showed a lack of ability to accelerate at the interval phases. Moreover, the hurdle clearance time between phases was longer in the national athletes than in the foreign athletes and lacked consistency. Conclusion: The national athletes lacked the ability to accelerate at the transition, maximum rhythm, rhythm maintenance, and re-acceleration phases and showed a longer hurdle clearance time. If technical improvements and strategic training methods using rhythmic units are applied for hurdling motions, the national athlete's hurdling abilities, performance, and consistency could improve.
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Kinematical Aspects Gliding Technique in 500-m Speed Skaters: From Start to Seven Strokes
류재균,김영숙,홍성홍 한국운동역학회 2016 한국운동역학회지 Vol.26 No.4
Objective: The purpose of this study was to assess the consistency of the gliding and push-off motion for single leg skating from the first to fourteenth steps. We hypothesized that: 1) there would be no difference in stroke trajectory, step rate, and cycle rate between the left and right steps of gliding; and 2) there would be a difference in the resultant velocity of toe push-off and the horizontal velocity of the center of mass after six step push-offs. Method: The study included five male 500-m speed skaters (mean height, 1.80 ± 0.02 m; mean weight, 76.8 ± 3.96 kg; record, 35.83 ± 0.30 sec; 100-m record, <9.97 sec). Data were collected from the first to fourteenth steps (40 m) and recorded using five digital JVC GR-HD1KR video cameras (Victor Co., Japan) operating at a sampling frequency of 60 fields/sec and shutter speed of 1/500 sec. For each film frame, the joint positions were digitized using the KWON3D motion analyzer. Position data were filtered with low-pass Butterworth 4th order at the cut-off frequency of 7.4 Hz. Results: The right toe of the skating trajectories at 2nd, 5th, and 7th strokes differed from those of the left toe. The angles of the right and left knee demonstrated unbalanced patterns from the flexion and extension legs. The step and cycle rates of the right and left leg differed from the start until 20 m. The resultant velocities of the toe at the push-off phase and of the body mass center diverged before the six push-offs. Conclusion: This study's findings indicate that the toe of skating trajectory on left and right sliding after push-off should maintain a symmetrical trajectory. The resultant velocity of toe push-off and horizontal velocity from the center of body need to be separated after about six step push-offs.
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남자 스피드 스케이팅 500 m 후반부 직선 구간 스트로크의 운동역학적 분석
김영숙(Kim, Young-Suk),홍성홍(Hong, Seong-Hong),류재균(Ryu, Jae-Kyun) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.1
The purpose of this study was to investigate the consistency, work per stroke and power of the gliding and push-off motion for speed skating 400-500 m section. The study included fourteen male 500 m speed skaters (mean height, 1.80 ± 0.03 m; mean weight, 76.1 ± 4.38 kg; record, 35.58 ± 2.73 sec)were divided three groups by record(A〈36.00 sec, 36.00 sec ≤ B ≤ 36.50 sec, C〉36.50 sec). Data were collected four strokes from middle of 400-500 m section and recorded using six digital SONY FDR-AXP35 video cameras (SONY, Japan) operating at a sampling frequency of 60 fields/sec and shutter speed of 1/500 sec. For each film frame, the joint positions were digitized using the KWON3D motion analyzer. Position data were filtered with low-pass Butterworth 4th order at the cut-off frequency of 7.4 Hz. The results of the study showed that the stroke time, the gliding distance, the stroke width and the amount of work per stroke was high value and the stroke frequency was low. On the contrary, the stroke time, the stroke distance, the stroke width and the amount of work per stroke is low value, and the stroke frequency is increased. This study"s findings indicate that the skaters need to improve their physical strength to perform a consistent and symmetrical stroke. To increase the amount of work per stroke, the stroke distance should be increased while reducing stroke time. Stroke frequency should be increased to increase power. In order to increase the frequency, it is necessary to adjust the stroke width. Stroke frequency and stroke width are important to improving performance.
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