乒乓球運(yùn)動(dòng)員控球穩(wěn)定性試驗(yàn)與理論研究
[Abstract]:The point system is the most commonly used ranking method for many athletes in sports. According to the competition in which the athletes take part and the ranking obtained, it can roughly reflect the overall level of the athletes, but the ranking is also affected by some accidental factors. If the key ball in the game is lucky, so the athlete's stability may be different from his ranking in a certain period of time, but for the important event, the coach should give a comprehensive consideration to the player's recent performance. Especially give play to stability. In view of the problem that the ball control stability of table tennis players can not be quantitatively described, the landing point data of 6 athletes at different levels were obtained by the self-designed landing point acquisition system test. The mathematical expectation, variance, covariance, correlation coefficient, Hurst exponent and correlation dimension were calculated by mathematical statistics and fractal theory, respectively. The results showed that the parameters in mathematical statistics and fractal methods could not measure the ball control stability of athletes separately, the Hurst exponents of the landing points were between 0. 5 and 1. 0, and had a long range positive correlation, which accorded with the fractal characteristics. The proposed correlation expectation rate can better measure the stability of the player's ball control, and the greater the value is, the more stable the player's control of the ball is. The results provide a theoretical basis and a way to realize the stability of ball control for table tennis players. At the same time, it also provides a way for coaches to appoint players according to different technical characteristics of opponents, in addition, Players themselves can also according to their own control of the associated expectation rate to reasonable training to improve the stability of play.
【作者單位】: 上海理工大學(xué)能源與動(dòng)力工程學(xué)院;上海體育學(xué)院中國(guó)乒乓球?qū)W院;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(項(xiàng)目編號(hào):51676131;51176129)
【分類號(hào)】:G846
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