| Summary: | 碩士 === 國立臺中教育大學 === 體育學系碩士班 === 104 === THE STUDY Of SHUTTLECOCK AND ACCURACY Of FOREHAND SMASH
Of EXCELLENT BADMINTON PLAYERS Of ELEMENTARY SCHOOL AND SENIOR HIGH SCHOOL
Graduate student: Wang Sin Siung
Adviser: Hsu Tai Yen
Abstract
The Purposes of this study was to explore : a) whether there are differences between the ball speeds of the players (of elementary school and senior high school) aiming or not aiming at the target area. b) whether there are correlations between the initial ball speed and accuracy of the forehand smash of the players in elementary school and senior high school aiming at the target area. Methods: The participants of experiment were the elementary school team that won the national badminton championship boys’ group in 2014, 16 players of senior grades of AA Elementary School, Taichung City, average height: 150.81±8.63 cm, average weight: 38.31±6.82 Kg, and the senior high school team that won the silver medal in National High School Games, men's overall team, in 2013, 19 players of BB Senior High School, Taichung City, average height: 167.63±6.11 cm, average weight: 61.16±6.71 Kg. They played forehand smashes on the hitting area at 5.50 meters in front of the net. The researcher set one high speed camera, Casio EX-FX1 300Hz item model on the hitting area and the other one on the target area. Not aiming at any target area in the first round and served from the coach , the 35 players in the same hit zone made every effort on the 5 times of forehand smash, and the measured result was the initial ball speeds of forehand smash without target area; in the second round, the coach served the ball, and the participants played a forehand smash on the same hitting area with aiming at the 150cm * 150cm target area on the bottom line after the net. Each player had to hit the ball into the target area successfully for five times, thus the data of the initial velocity of forehand smash with aiming at the target area could be measured, and simultaneously, the error distance between the ball placement and the center of target area was also obtained. The experimental data of the initial velocity of forehand smash with or without aiming at the target area were analyzed by dependent sample t test (α = .05) to know whether the difference is significant. The experimental data of the initial velocity of forehand smash With aiming at the target area and the centroid error were analyzed by Pearson's Product-Moment Correlation Coefficient (PPMCC) and descriptive statistics
(α = .05). Results: This study found the average velocity of elementary school group's forehand smash without and with aiming at the target area was separately 49.98±8.67 m/s. and 43.98±8.44 m/s. Besides, the average velocity of senior high school group was separately 74.23±9.04 m/s. and 60.06±11.55 m/s. The two groups' velocities between with and without aiming at the target area had both significant differences. As to the accuracy test of the forehand smash velocities of the elementary school group and senior high school group, the error distances of the placements were 48.94 ± 18.86 and 40.19 ± 18.06 cm, and the Pearson's correlation coefficients were separately 0.01, p=0.95 and -0.21, p=0.04. Conclusion: the velocity difference of forehand smash between with and without aiming at the target area in the two groups were both significant. This means there is a trade-off between velocity and accuracy. The senior high school group had high initial velocity and high accuracy in smash, and the velocity and centroid error were significantly negative correlated; this means the higher the velocity, the higher the accuracy, however, the velocity and error distance were not statistically correlated in the elementary school group.
Keyword: target area, centroid error , trade-off
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