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[[alternative]]Kinematical Analysis via Three - Dimensional Cinematography for Two Types of Forehand Smash Stroke in Senior High School Badminton Players
No full text[[abstract]]Kinematical Analysis via Three - Dimensional Cinematography for Two Types of Forehand Smash Stroke in Senior High School Badminton Players
Master Thesis , 2003 Shaw-Shiun Chang Advisor : Chen-fu Huang. Ph.D.
ABSTRACT
The objective of this study is to compare the performance by eight elite badminton male players（ages; 18.4±0.5years，height;174.1±4.6cm，weight; 67.3±4.2kg） from Taiwan senior high school who finished third in the 2000th academic year National High school Athletic Meet. Two Red Lake high-speed video cameras operating at 250Hz were used to record the subjects when they were executing the smash and jump smash stroke actions. The cameras were set up to record the movements of the upper limbs in the sagittal plane. In this study, we have analyzed the motions with Motus and SAS 8.02ver software. A t-test was used to evaluate the correlation for the execution of jump smash and smash with the selected relevant biomechanical parameters. The selected parameters were test at 0.05 significant levels. The results showed that:
1.A significant correlation（p<0.05）is indicated between the flight angles for jump smash and smash. The average shuttlecocks flight angles for jump smash at -15.7±3.5° is much greater than that for smash at an average of -7.1±3.4°.
2.The contact point of jump smash （2.82±0.08m）is higher than smash（2.44±0.05m）.
3.The following biomechanical variables also indicated a more significant change during the execution of jump smash in comparing with smash:
(a) The distance between the lowest point of center of mass (COM) to minimum height of COM just before the instance of making contact with the shuttle.
(b) The minimum height of the COM comparing with the player’s height
(c) The heights of the COM before and during making contact with the shuttle and the elevation of the COM in relation with the players’ heights
(d) The lateral distance between backward and forward movements, the time rate of change of the location of COM and the total time for motion execution
The reason is due to the prior action of squatting of the body before jump while executing the former stroke action.
4.The distance of contact point to COM, the horizontal distance and the average angle between upper limb’s joints showed no appreciable deviation during the motions of jump smash and smash. The analysis showed consistency in the stroke motion for the high school badminton players while executing either the jump smash or smash actions.
5.While executing the two stroke actions, the senior high school badminton players showed a larger extension of the upper arm and a sharper angle at the elbow joint. The players also showed accelerated wrist angle velocity at contact and a distinct flexing of the wrist is clearly visible. The combined actions resulted in an accelerated shuttle initial speed.
keyword：Biomechanics, Badminton, smash, jump smash, Kinematics, Three- Dimensional Cinematography
