For the purpose of acquiring basic knowledge to apply to the instruction of the Forehand Stroke, two seperate cameras had been used on the locus of 7 different points of two tennis beginners in college applying the Vibration Chrono Cycle Graph Method.
The following conclusion has been obtained by comparing, analysing and studying the photographs taken on horizontal moving distance, height and the degree of angle of angle of arm joint.
1. Regarding to the horizontal movement. the power of impact seemed reinforced due to the further movement of Sub. C than Sub. J by 32㎝ of Racket’s top, Wrist 26㎝, Elbow 13㎝, Shoulder 8㎝, Waist 5㎝, Knee 6㎝, and Left Foot by 28㎝.
2. Related to height, hitting was stablized as Sub. C made lower movements than Sub.J by 19㎝ of Racket’s top. Wrist 19㎝, Elbow 5㎝, Shoulder 11㎝, Waist 16㎝, Knee 14㎝ and Left Foot by 1㎝.
3. In the performance of Back Swing, the horizontal movement of the Racket top in Sub. C was shorter by 36㎝ than that of Sub. J and motioned a round back swing while Sub.J did horizontal back swing.
4. On the wrist of Arm, Sub.C maintained in the degree of more than 200 signifying that the use of the wrist was very nil and the elbow maintaining less than 180 degrees represents thehitting is in the stablized stage witty slight bend of the elbow.
5. As to the dimension of swing of the Racket’s top, Sub.C made larger circularity by 49㎝ in diameter than that of Sub.J producing stronger power.