The purpose of this study was to identify the technique of exerting impulsive forces in Karate Mawashigeri (round-house kick) by comparing impulsive forces of the kicking leg between eight types of Mawashigeri.
Five male Karate players were used as subjects (175±6.02cm,71.2 ±7.79kg). Their impulsive forces of the kicking leg were measured by the steel pipe (34mm across,80mm length,5mm thick) which stuck the straingauges on its surface. The steel pipe was fixed to the steel pool at the 1.2m height. Their impulses of the supporting foot was measured by force platform. Their kicks were recorded by a high speed video camera opearating at 60 frames/sec.
Eight types of Mawashigeri were classified as some groups. Group 1 was the types which moved the supporting foot to the outside before the kicking motion, and the types which extended the bending knee of kicking side after passing the center line. The center line was the line which connected the center of body with the target. Group 2 was the types which moved the supporting foot to the inside before the kicking motion. Group 3 was the types which moved the supporting foot to the outside before the kicking motion, and the types which extended the bending knee of kicking side before passing the center line. Group 4 was the types which moved the supporting foot to the outside with kicking motion. Group 5 was the types which kept the bending knee of kicking side at the back of body. Group 6 was the types which kept the bending knee of kicking side at the side of body.
The results were as follows:
1) There was correlation between the impulsive forces and the peak values of impulsive forces and the left side impulses of force platform.
2) There was correlation between the impulsive forces and the peak values of impulsive forces and the maximum velocities of the kicking leg.
3) Group 5 showed larger the peak values of impulsive forces than those of Group 6, and Group 1 showed larger the impulsive forces and the peak values of impulsive forces than those of Group 3.
4) Group 1 showed larger the left side impulses of force platform than those of Group 2.
5) Group 1 shuwed larger the maximum velocities of the kicking leg than those of Group 3.
The techniques to increase the impulsive force of Mawashigeri were as follows:
1) Keep the bending knee of kicking side at the back of body.
2) Extend the bending knee of kicking side after passing the center line.
3) Move the supporting foot to the outside before the kicking motion, or with the kicking motion.
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