Judo Vector Free Download
Augustus Fenstermacher
Download the vector logo of the Hungarian Club of Judo-Masters brand designed by in Scalable Vector Graphics (SVG) format. The current status of the logo is active, which means the logo is currently in use.
The seoi-nage is one of the most important skills in judo. Seoi-nage skill is a movement skill, in which a judo athlete particularly uses to pull his or her opponent in different directions before throwing over one's back1,2,3,4,5,6. Seoi-nage labeled for efficient movement of upper and lower limbs is a difficult throwing technique since this complex skill form makes use of the degrees of freedom in the majority of the joints in the body7,8. The attacker's unbalance and the speed of the torso's rotation are both related to a high level of seoi-nage5,6,7.
Athletes should pull the opponent firmly, shake their center of gravity, and quickly swivel their torso to lift them in order to execute the seoi-nage skill properly. The throwing movement through seoi-nage is quicker than that used by judo athletes according to expertise. Previous research indicated that elite athletes (i.e., experts) exhibited delayed response initiation and body and postural responses following external perturbations with compared to non-elite athletes (i.e., amateur1,5,6. Moreover, elite athletes tilt their bodies more, which allows for quick torso rotation. And enough forward pull facilitates quicker and more precise placement1.
Several studies to understand judo skills in soei-nage have been conducted, but little is known to explain the mechanism how athletes with different levels of skills and execution demands perform in the process of motor skill acquistion. It has been reported that the seoi-nage is crucially played in the adaptability of body/balance control when postural stability is perturbed. However, specific kinematic characteristics of seoi-nage particularly associated with skill level are still unknown.
The aim of the present study was to examine the kinematic characteristics of seoi-nage on body/balance control in response to skill level. In this study, the kinematic variables of seoi-nage were simultaneously examined in three dimensions while the force magnitude was measured by suspending a rubber tube for judo training in judo-specific equipment. Our study differs from earlier ones in particular by simultaneously analyzing kinematic features and measuring the force value of seoi-nage using specific equipment. Our hypothesis was that, in a period of seoi-nege, non-elite athletes would demonstrate bigger kinematic deficits than elite athletes do. Consequently, these results can probably be used as factual information to improve the efficiency of judo seoi-nage learning and to further serve as the foundation for precise training recommendations.
A vector system was used to measure the magnitude and direction of the force. A three-axis load cell sensor was used to measure the magnitude and direction of the force on the Z-axis approximately 9800 N (in 1 ton), X and Y-axis approximately 4900 N (in 500 kg), and nonlinearity (1%). The maximum yield load was 150%. While the Z-axis measured the subject in the horizontal direction, the Y-axis and X-axis measured those in vertical and horizontal directions. We measured the magnitude of force appearing in the X, Y, and Z directions and the sum of the force vectors at a sampling frequency of 200 Hz (Fig. 1). The rubber tube connected to the judo throw analysis device was held with both hands to perform seoi-nage at maximum speed and force. The baseline was similar for the rubber tube and both arms. The equipment was located 80 cm from the ground, and the distance between the participant and the equipment was 150 cm.
Vector analysis device. After fixing the judo vector equipment to the wall, the judo rubber tube is hung on the load cell hook to perform shoulder throw. The pulling force and direction are measured simultaneously.
At the hip and knee joint flexion angles, EG showed a more extended pattern than NG, indicating that it looked to match the extended pattern required during the positioning phase. The maximum force vector sum in EG was 102.8 N, which was higher than in NG. This suggests that EG was more effective at pulling than NG in terms of pulling force magnitude1,2,5,10. In comparison to NG, EG showed higher extension in the hip and knee joint flexion angles, indicating that it behaved similarly to how extension is needed during the throwing phase. In Summary, EG had a stronger vector sum of forces than NG. Moreover, EG outperformed NG in terms of the rate of change in shoulder and pelvic tilt as well as horizontal rotation. Also, it showed hip and knee joint flexion and extension patterns that were more useful for throwing.
K. Momirović, "A simple method for analysing the factors relating with the results in judo competitions", Kinesiology, vol.8., br. 1.-2., str. 0-0, 1978. [Online]. Dostupno na: [Citirano: 24.12.2023.]
A simple procedures for analysis of factors relating with the results in judo competitions is described. The procedure is based on the Johnson's method for pairwise monotone regression. An algorithm synthetising the results of different analyses is proposed, consisting essentially in the determination of the first component vector of regression weight matrix.
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