Japan Table Tennis Association Scientific Committee
on Sports Medicine Committee
Hisao Ishigaki Aichi Institute of Technology
The current ball is 38 mm, 40 mm gradually coming off the ball changes. So the ball is 40 mm experiment. 1 experiments comparing the speed of 38mm and 40 mm
Speed of 40 mm and 38mm research. professor at the Osaka University (Japan Table Tennis Association of Sports Science and Medicine Committee member) is 2.7 g or more 40mm But if speed is no evidence that it was a simulation, so what actually checked. Impressed with the ball machine, and 5 m linear distance between measurement speed. Measurement methods and exit the machine, a distance of 30 cm from the exit of infrared sensors to set up a cardboard 5m position (behind vibration sensor) has been established. Up to 30 cm out of a tempo, cardboard, or the time before 1msec measured. In addition to moving the distance of 30 cm ball coma 1000 / s in high-speed photography, muzzle velocity calculated from the number of time-frame, this is the same result by infrared snsors can be verified. Figure 1 is the result.
38mm and 40 mm is almost the same speed as a result.
This is the result of calculation辻teacher and almost the same value. 40mm ball even if more than 2.7 g and 38 mm辻not change the conclusion of the teacher and support. 2 paddler for experimental questionnaire
Table Tennis Aichi Institute of Technology conducted a survey of 21 staff. Most players will experience the first ball is 40 mm.
Figure 9 and Figure 2 is the result.
# 40mm ball, a slightly larger sense, a bit prettier.
# "Somewhat difficult to beat," Many people feel. This is the rotation or considering such action believe that a comprehensive evaluation.
# The sense of speed ball, the rebound bounced after feeling "slightly slow" and "very slow" and most people feel. However, this is so accustomed to 38 mm, 40 mm reverse slow and feel. In spite of the same speed (experiment 1) 40 mm feel is slow, if the same speed, great moves slower than the speed of the small ones feel that the illusion. 40 mm hit the next ball just as if they later find that you will not believe.
# Ball is in a sense, "somewhat serious" and "slightly light" divided, but many people feel heavy in proportion.
# Operability of the rotation is multiplied answers "somewhat difficult to" top. Especially hard to feel over the rotation.
# 40mm would be advantageous to athletes, need to be trained to write me summarise the results of the rotation is difficult to call it a cut because slower is better to become a man and therefore will continue to rally, endurance is required. And the ball is heavy, strength training and the need to be considered. Reaction time of 3 experimental 40mm ball
Ping-pong ball from white to orange when the British were David Roger orange ball to measure response time, the orange ball is faster and better response to the report. So the 38 mm and 40 mm to measure response time. Table tennis is subject Aichi Institute of Technology staff of 21 men and women. randomly from the ball machine (15 balls each, a total of 30 balls) After immediately visible to the infrared cut rackets simple reaction time.Figure 10 is the result.
40mm ball 14 msec response time is faster results. 40mm ball from about 10 percent larger in area ratio, reaction time and seems to foster. However, the difference is only 14 msec from the 40mm ball would be more quickness and play - it is unlikely that. 4 experimental 38mm and 40 mm difference in the ball hitting center
Survey results from 40 mm with a heavy feeling of hitting the ball and I feel that it is unusable, but the racket or ball point affect research. Machine in the diagonal direction beaten to the ball, 5m distance of 50 cm from the machine direction of a return to the four corners conditions.
Fuji Film Press rackets to Kehl (LOW for the low pressure) from the center of the patch and rackets X axis, Y-axis unit mm distance of the ball to point measurement. 38mm, 40mm ball with a total of 40 balls. Aichi Institute of Technology subject is table tennis player is right-handed staff of only 14.
。 Figure 11 results in Figure 12.igure 11 is an example of T-ball player (pen) distribution points. The ball distribution from the center point (center of gravity) for the difference between 38mm and 40 mm to be tried in Figure 12.
Figure as evident from the pen of the players distribution center located above the X axis, the X axis near Sheikh where you can find. Almost all of the 40mm ball (14 in the name of 13 persons) racket in the heart of the center is that it is shifting to them. The difference is about 6 mm in diameter balls about 1 / 6 degrees.
For this reason, 40 mm at the tip since shed 38 mm heavy reliance on the losing side of it, players are unknowingly taking center of rackets?.
This experiment is (stock) from the Japanese table tennis ball provided by the catastrophe. Thank you wrote.
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